We Buy Catalin Radios

Sentinel 284 Radio Catalin 'Wavy Grill' in Sand with Yellow

Incredibly Marbleized Sand 'Wavy Grill' Sentinel

Stunning Catalin Sentinel 'Wavy Grill' model 284 radio in marbleized sand with yellow trim. The glossy sand colored catalin cabinet has beautiful yellow, orange and brown marbleizing that really adds depth to the cabinet. This radio was made circa 1945 by The Sentinel Radio Company of Evanston, Illinois Known to collectors as 'Wavy Grill' Sentinel, the designers surely drew inspiration from the automotive world. Along with the insert Catalin speaker grill and the slant front frequency indicator, the dial glass allows for easy viewing from above the radio as well, and acts as an additional architectural touch to make an already attractive radio into a true work of art. This set would make this radio a truly beautiful addition to any collection. The radio is just a stunning example of this Catalin Sentinel model. Radio is in excellent condition with no cracks, chips, tube burns or repairs. The yellow catalin grill + knobs are original and in great condition with no cracks, chips, burns or repairs. The dial glass + back panel are original to the radio and are in great condition. Radio has small scratches consistent with age + use of set. This radio is absolutely stunning and would make a fantastic addition to a collection. This radio measures approximately: 11" wide by 7" high by 6.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working"

Sentinel 284 Radio Catalin 'Wavy Grill' in Sand with Yellow

Incredibly Marbleized Sand with Yellow Trim Sentinel

Beautiful Catalin Sentinel 284 'Wavy Grill' radio in marbleized sand with butterscotch trim. The glossy sand colored catalin cabinet has beautiful yellow, orange and brown marbleizing that really adds depth to the cabinet. This radio was made circa 1945 by The Sentinel Radio Company of Evanston, Illinois Known to collectors as "Wavy Grill" Sentinel, the designers surely drew inspiration from the automotive world. Along with the insert Catalin speaker grill and the slant front frequency indicator, the dial glass allows for easy viewing from above the radio as well, and acts as an additional architectural touch to make an already attractive radio into a true work of art. This set would make this radio a truly beautiful addition to any collection. The radio is just a stunning example of this Catalin Sentinel model. Radio is in excellent condition with no cracks, chips, tube burns or repairs. The yellow catalin grill + knobs are original and in great condition with no cracks, chips, burns or repairs. The grill cloth, dial glass + back panel are original to the radio. Radio has small scratches consistent with age + use of set. This radio is absolutely stunning and would make a fantastic addition to a collection. This radio measures approximately: 11" wide by 7" high by 6.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working"

Sentinel 284 Wavy Grille Radio Catalin in Sand with Butterscotch

Incredibly Marbleized Sand Wavy Grille Sentinel

Eye-catching Catalin Sentinel 'Wavy Grill' model 284 radio in beautifully marbleized sand with yellow trim. The glossy sand colored catalin cabinet has beautiful yellow, orange and brown marbleizing that really adds intensity the cabinet. This radio was made circa 1945 by The Sentinel Radio Company of Evanston, Illinois Known to collectors as 'Wavy Grill' Sentinel, the designers surely drew inspiration from the automotive world. Along with the insert Catalin speaker grill and the slant front frequency indicator, the dial glass allows for easy viewing from above the radio as well, and acts as an additional architectural touch to make an already attractive radio into a true work of art. This set would make this radio a truly beautiful addition to any collection. The radio is just a stunning example of this Catalin Sentinel model. Radio is in excellent condition with no cracks, chips, tube burns or repairs. The yellow catalin grill + knobs are original and in great condition with no cracks, chips, burns or repairs. Back panel is original to the radio in great condition. The dial glass is a correct replacement  + grille cloth is a NOS replacement. Radio has small scratches consistent with age + use of set. This radio is absolutely stunning and would make a fantastic addition to a collection. This radio measures approximately: 11" wide by 7" high by 6.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working"

Sentinel 284-NB Catalin 'Outline' Grill Radio in Lapis-Lazuli Blue - Rare

Rarely Seen Blue Sentinel Catalin Radio

Rare Catalin Sentinel 284 'Outline Grill' radio in marbleized lapis-lazuli blue (oxidized to green) with butterscotch trim. Finding an example of this radio in blue is extremely difficult as only a few exist. The original bluish-green patina on this radio is beautiful with it's strong veins of yellow with tones of blue running through it that makes this an incredible example. This set would make this radio a truly beautiful addition to any collection. This radio was made circa 1945 by The Sentinel Radio Company of Evanston, Illinois Known to collectors as 'outline grill' Sentinel, the designers surely drew inspiration from the automotive world. Along with the catalin speaker grill surround and the slant front frequency indicator, the dial glass allows for easy viewing from above the radio as well, and acts as an additional architectural touch to make an already attractive radio into a true work of art. The radio is just a stunning example of a blue catalin Sentinel model 284 that has only been lightly polished to a high gloss while preserving the great original patina. The catalin cabinet is perfect with no cracks, chips, tube burns or repairs and has beautiful intense marbleizing that really adds depth to the cabinet; however it does have a tiny chip on the rear back panel retaining hole which is common to this model....this is not visible from the outside with back panel on. The chunky yellow catalin grill surround and knobs are original and in great condition with no cracks, chips, burns or repairs. The grill cloth, dial glass + back panel are original to the radio and show minimal signs of age. Radio has small scratches consistent with age + use of set. This radio is absolutely stunning and would make a fantastic addition to a collection. This radio measures approximately: 11" wide by 7" high by 6.25" deep. This set is sold "as-is + untested", the chassis appears complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sentinel 284-NB Catalin Outline Grille Radio in Marbleized Oxblood Red

Vibrantly Marbleized Oxblood with Yellow Trim Sentinel

Highly marbleized Catalin Sentinel 284 NB 'Outline Grille' radio in marbleized oxblood red with yellow trim. This radio was made circa 1945 by The Sentinel Radio Company of Evanston, Illinois Known to collectors as 'outline grille' Sentinel, the designers surely drew inspiration from the automotive world. Along with the catalin speaker grill surround and the slant front frequency indicator, the dial glass allows for easy viewing from above the radio as well, and acts as an additional architectural touch to make an already attractive radio into a true work of art. The Catalin has a deep shine, rich color + glow combined with exceptionally colorful yellow and orange marbleizing that looks like veins of fire running through the cabinet.  The radio is in original, untouched condition, and is just a stunning example of this Sentinel model.The radio is just a stunning example of this catalin Sentinel model. The glossy catalin oxblood red cabinet has beautiful marbleizing that really adds depth to the cabinet + is in excellent condition with no cracks, tube burns or repairs. The chunky yellow catalin grill surround and knobs are original to the radio and in great condition with no cracks, chips, burns or repairs. The grill cloth, dial glass + back panel are original to the radio and show minimal signs of age. Radio has small scratches consistent with age + use of set. This radio is absolutely stunning and would make a fantastic addition to a collection.This radio measures approximately: 11" wide by 7" high by 6.25" deep. This set is sold "as-is + untested", the chassis appears complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sentinel 284NR "Wavy Grill" Catalin Radio Knobs - Original Butterscotch Pair

Original Butterscotch Sentinel 284NR Catalin Radio Knobs.  These original knobs will fit any color Sentinel 284 " Wavy-Grill" model. Not shown but included are the original brown felt washers that go inbetween knobs a cabinet. Pair is in great condition with no cracks or chips, just some light scratches consistent with age + use. These knobs have not been cleaned or polished. Perfect to complete a radio or replace repro knobs with original ones.

Shyvers Multiphone Art Deco Jukebox Selector with Bracket - Incredible Skyscraper Design

Rare Empire State Building Shyvers Jukebox Selector

Art Deco Shyvers "Multiphone" jukebox selector in cast aluminum with rare ornate wall bracket. This spectacular piece has a strong resemblance to the Empire State Building. The Shyvers Multiphone was invented in 1935 by Ken Shyvers, who is also credited for inventing the pinball machine. The strong Art Deco architectural lines make for a stunning display item. The Multiphone was a music selection device that operated over telephone lines mostly in Seattle, Tacoma and Olympia, Washington from 1939 to 1959. These units were typically placed on tables, counters or bars. A patron could deposit a coin and speak with a telephone operator standing at a turntable at the Central Music studio, who would then play a selection in the speaker at the bottom of the Multiphone. These units became popular because they had a record range of 170 whereas jukeboxes only had a record range of 20-48. This unit is in great original condition and is complete with the dark red faceted “jewels” + bright red grill cloth. The unit has the original screw-type lock and key to access the coin mechanism. The unit is in great condition for its age it has some scuffs and mold marks consistent with the molding process + years of use. The unit has a serial number #773 on top casting making this an early production model. This stately Art Deco piece of coin-op history measures 17” high. This set is sold "as-is + untested", the insides seem complete. Jukebox selector is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Silvertone 'Rocket' 6110 Radio in Jet Black Bakelite

Striking 1930's Machine Age Radio Designed by Clarence Karstadt

Deco Silvertone Model 6110 in Jet Black Bakelite manufactured in 1938.  This incredible radio is referred to by collectors and design addicts alike as the 'Rocket', and is a particularly striking example of 1930's Machine Age design. Designed at the height of the Art Deco era by Clarence Karstadt, it is clear that it was inspired by the streamlined locomotives of the time.  The radio's styling is unsurpassed, and it has been cited in a numerous books and articles as a highlight of the Machine-Age design movement. Even though it was prominently featured in all of the Sears catalogs of the time, it was not a strong seller and is extremely rare and difficult to find. This set is very prone to damage and few have survived in damage free condition The chassis is heavy and the case is closed on all sides. This design often caused heat build-up and eventual cracking for many of these radios thus limiting their survival.  The jet black cabinet is in good condition; however it was professionally repaired by Dan Blake over 20yrs ago and has been in my personal collection since.  Repairs are located on bottom of cabinet and on flat side panel and can only been seen when looking for them or looking at inside of cabinet/panel.  The original large Bakelite tuning dial that takes up the entire end of the radio is perfect with no cracks, chips, burns or repairs and still has the original Bakelite retaining screw also un-cracked. The 6 black Bakelite push buttons on top are all original and in great condition as well. Radio retains its original black grill cloth. Radio has been well taken care of and only shows some small signs of age + careful use. This rare black Silvertone Rocket radio is absolutely striking and would make a fantastic addition to a Radio or Deco collection. Radio measures approximately: 12" Wide by 6.5" High by 6.5" deep.This set is sold "as-is + untested", the chord is cut. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Silvertone 4511 'Election' Plaskon Radio in Lavender - Rare

Silvertone 'Election' Bakelite/Plaskon Radio designed by John R. Morgan

This lavender plaskon Silvertone 4511 'Election' radio is a beautiful example of 1930's Streamlined Machine Age design in plastic. The design includes great rounded edges and molded plastic ridges that travel up and around the radio. The single piece cabinet that can be viewed from all sides is the work of noted industrial designer John R. Morgan. This truly is a rare and striking design for an Art Deco Radio in an even more rare of a color. This model first appeared in the 1936 Sears catalog and won first prize as an object of 'outstanding beauty' in the nationwide Modern Plastics Competition in New York City Note that the cases of this model are extremely fragile, and as a result few appear to have survived. These cases often cracked or became distorted due to the heat of the tubes and the weight of the chassis, which slides in from the bottom. The beautiful lavender colored Plaskon/Bakelite cabinet is in great original condition and retains a beautiful luster. The cabinet has no chips, burns, or repairs. It does have a few tight hairlines and small scuffs/nicks common to Plaskon radios of the time that can be seen in the photos. These in no way detract from this rare radio. Radio retains the original matching lavender plastic knobs, manufacturers paper label and the gold textured fabric grill cloth on front and rear. This radio measures approximately: 9.25" Wide by 7" High by 6" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sleek Art Deco Side Table by Donald Deskey - Circa Late 1920's

Rare Donald Deskey American Art Deco Coffee or Occasional Table

Sleek Art Deco Side Table, designed by Donald Deskey for Ypsilanti Reed, circa late 1920's. This design was first exhibited by Deskey at the American Designer's Forum in 1928. Documented in the Donald Deskey book by Hanks & Toher, pgs. 89, 171 and in the At Home In Manhattan book, pg. 111. This is a rare early Deskey Art Deco table to find. Made of chrome plated steel and two rectangular shelves of black ebonized wood with polished Bakelite wrapped tops supported by four flat sided curved legs.  This small sleek and elegant table is a versatile size and could be used as a lamp table, end or side table, or night stand. Donald Deskey was a pioneer of the American Art Deco movement. Table is all original and shows minor signs of use consistent with age. Measures approximately: 19.25" wide by 12" deep by 17.5" high

Small Catalin Speaker - Vibrant Marbleized Azure Blue

Beautiful Azure Blue marbleized catalin speaker. This speaker was manufactured in 1944 by Catalin Ltd. at Waltham Abbey, Hertfordshire, Essex, UK. Seldom do you see these being sold in this vibrant color of Catalin. This little speaker has a copper mesh grill that adds to the quality of the build. The cabinet is free of cracks, chips, burns or repairs. The marbleized azure blue has been cut/polished back to the factory color and looks absolutely striking. Retains its original speaker inside the cabinet. The copper mesh on the speaker is an exact replacement for the original. Speaker has small scratches consistent with age + use. Speakers measures approximately: 5.5" wide by 6" high by 2.5" deep. This set is sold "as-is + untested".  Item is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician prior to use.

Small Catalin Speaker in Highly Marbleized Sand

Beautiful Sand colored marbleized catalin speaker. This speaker was manufactured in 1944 by Catalin Ltd. at Waltham Abbey, Hertfordshire, Essex, UK. This little speakers has a copper mesh grill that adds to the quality of the build. The glossy sand colored catalin cabinet has beautiful yellow, orange and brown marbleizing that really adds depth to the cabinet. The cabinet is free of cracks, chips, burns or repairs. The copper mesh on the speaker is an exact replacement for the original. Speaker cabinet has small scratches consistent with age + use. Speakers measures approximately: 5.5" wide by 6" high by 2.5" deep. This set is sold "as-is + untested". Item is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician prior to use.

Sonora KM 'Coronet' Catalin Radio in Alabaster + Green

Seldom Seen Color Combination for a Catalin Sonora KM

Sonora KM 'Coronet' Radio in marbleized alabaster catalin with bluish-green (pastel blue) catalin trim. This example has the rare original pastel blue trim which has taken on a green patina. The contrast in color makes for a great Art Deco radio. This is the only Catalin radio produced by Sonora Radio of Chicago, Illinois. The subtly marbleized Catalin cabinet has beautiful transparency that gives it depth. This scarce catalin radio has no cracks, chips or repairs to cabinet or trim; has minor tube burn which is often the case with this model also has a small chip on inside of cabinet where back panel screws in. The radios front faceplate, knobs and handle are original to the radio and makes for a nice contrast in color.  Radio has the original light blue/green center dial pointer, mesh grill cloth and back panel.  Dial plastic and water-slide decal are correct replacements. Radio cabinet has been cut/polished back to its original alabaster color by Decophobia and has an incredible gloss to it.  Radio measures approximately: 9" wide by 5.5" wide by 5.25" deep. This set is sold "as-is + untested", the chassis seems complete.  Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sonora KM 'Coronet' Catalin Radio in Butterscotch + Plum

Great 2-Tone Sonora 'Coronet' Catalin Radio

1941 Sonora KM 'Coronet' Radio in yellow catalin with plum catalin trim makes for a great Art Deco radio in a wonderful color combination. This is the only Catalin radio produced by Sonora Radio of Chicago, Illinois. The subtly marbleized Catalin cabinet has beautiful transparency that gives the radio depth. This scarce catalin radio has no cracks, tube burns or repairs to cabinet or trim; however it does have a small chip on the bottom back edge as seen. The radios plum front faceplate, knobs and handle are original to the radio and makes for a nice contrast in color. Dial plastic, water-slide decal and mesh grill cloth are correct replacements. Radio measures approximately: 9" wide by 5.5" wide by 5.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sonora KM 'Coronet' Catalin Radio in Yellow + Green

Seldom Seen Color Combination for a Catalin Sonora KM

Sonora KM 'Coronet' Radio in marbleized yellow catalin with bluish-green catalin trim. This example has the rare original pastel blue trim which has taken on a bluish-green patina. The contrast in color makes for a great Art Deco radio. This is the only Catalin radio produced by Sonora Radio of Chicago, Illinois. The subtly marbleized Catalin cabinet has beautiful transparency that gives it depth. This scarce catalin radio has no cracks, chips, tube burns or repairs to cabinet or trim. The radios pastel blue front faceplate, knobs and handle are original to the radio and makes for a nice contrast in color. Radio has the original light blue center dial pointer and mesh grill cloth. Dial plastic and water-slide decal are correct replacements. Radio measures approximately: 9" wide by 5.5" wide by 5.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sonora KM 'Coronet' Catalin Radio in Yellow + Maroon

Great + Perfect Two-Tone Sonora 'Coronet' Catalin Radio

Beautiful 1941 Sonora KM 'Coronet' Radio in yellow catalin with maroon catalin trim makes for a great Art Deco radio in a wonderful color combination. This is the only Catalin radio produced by Sonora Radio of Chicago, Illinois. The subtly marbleized Catalin cabinet has beautiful transparency that gives the radio depth. This scarce catalin radio has no cracks, chips, tube burns or repairs to cabinet or trim. The radios maroon front faceplate, knobs and handle are original to the radio and makes for a nice contrast in color. Radio retains the original light green center dial pointer and back panel. Dial plastic, water-slide decal and mesh grill cloth are correct replacements. Radio measures approximately: 9" wide by 5.5" wide by 5.25" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

SONY TR-78 Transistor Radio Prototype / Sales Sample - Marked "Sample Only"

Radio acquired from the family of an employee of Agrod in New York

Sony TR-78 Transistor Radio rare sales sample or prototype model.  Radio acquired from the family of an employee of the Agrod Company in New York who was the exclusive U.S. importer for all Sony radio + microphone products starting in 1957.  This TR-78 was shipped to Agrod by Sony as a sales sample of a radio that was being considered for the US market - this model radio was never made available as far as we can tell.  We have looked + have been unable to find reference to this model on Sony collectors websites and else where. This rare radio is faintly marked on the rear "Sample Only" and "Property of...".  Cabinet is ivory plastic that is factory painted a pink/rose color - most all plastics that are molded the dye is introduced into the melted plastic and blended during the molding process the color is throughout the plastic this cabinet was painted, further identifying it as a sample or prototype. Radio retains original tag on the back stating model # as TR-78 - Seven Transistor All Wave that is somewhat faded but can still be read.  Radio does have some damage + wear as seen in photos, one grill bar is cracked. Chassis seems complete except for the lack of speaker.  All parts on radio seem original and correct. Measures approximately: 13" wide by 5" high by 3.75" deep.  This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sparton 'Bluebird' 566 Blue Mirror Radio - Great Original

Striking Art Deco Cobalt Blue Sparton Bluebird Radio

Beautiful original Art Deco Sparton 'Bluebird' cobalt blue mirror model 566 radio designed by Walter Dorwin Teague for the Sparks-Worthington Company from Jackson, Michigan in 1936. The radio, known as the 'Bluebird' is a considered to be a great example of Deco Streamline style. The radio features a 14" cobalt blue mirror disc, with contrasting ebony painted ball feet finished with and 3 chromed bands or 'speed lines' dissecting the circular speaker + dial surround. The symmetric, geometric shapes and accent designs are distinctively art deco in appearance. Radio is in great condition and is free of chips, or cracks to the original cobalt mirror.  Mirror has not been re-silvered and shows some signs of age + use that are accentuated by the studio photos. Mirror retains the original felt affixed to the backside. Wood body (not bottom) and ball feet have have been resprayed in ebony paint. Chrome trim and knobs are original to the radio and show mild pitting, scratches. Radio retains the original back panel with 'Bluebird Model 566' stamped in white and grill cloth is also original and in good condition with only some mild staining and sign of use consistent with age and use. This is a prime original example of a highly sought after Art Deco radio that is matched by no other manufacturer in its flair and presence. Radio measures approximately: 14.5" high by 7" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sparton 'Bluebird' 566 Blue Mirror Radio w/ Original Plateau Deco Teague Design

Striking Art Deco Cobalt Blue Sparton Bluebird Radio

Stunning Art Deco Sparton 'Bluebird' cobalt blue mirror model 566 radio with factory original matching plateau designed by Walter Dorwin Teague for the Sparks-Worthington Company from Jackson, Michigan in 1936. The radio, known as the 'Bluebird' is a considered to be a great example of Deco Streamline style. The radio features a 14" cobalt blue mirror disc, with contrasting ebony lacquer ball feet finished with and 3 chromed bands or 'speed lines' dissecting the circular speaker + dial surround.  The symmetric, geometric shapes and accent designs are distinctively art deco in appearance. The display plateau is an original Sparton add-on item that was offered at the time of purchase for an additional cost; please see photo of original advertising. The cobalt blue mirror measures the same size as the radio mirror 14" and is the same color.  This original Sparton mirror is untouched, free of cracks, chips and has not been re-silvered; so it does show some wear and scratches The black felt on back of mirror plateau is also original. Included with the radio and plateau is a letter from original owners explaining that the radio was purchased with the plateau back in the day. Radio is in great condition and is free of chips, or cracks to the original cobalt mirror. Wood body and ball feet have original ebony lacquer in good condition. Chrome trim, knobs and back panel are original to the radio. Mirror was at some point re-silvered and chrome re-plated. Grill cloth is a period correct replacement. This is a prime example of a highly sought after Art Deco radio that is matched by no other manufacturer in its flair and presence. Radio measures approximately:  14.5" high by 7" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.

Sparton 'Bluebird' Blue Mirror Radio 566 - Beautiful Original

Striking Art Deco Cobalt Blue Sparton Bluebird Radio

Original and Beautiful Deco Sparton 'Bluebird' cobalt blue mirror model 566 radio designed by Walter Dorwin Teague for the Sparks-Worthington Company from Jackson, Michigan in 1936. The radio, known as the 'Bluebird' is a considered to be a great example of Deco Streamline style. The radio features a 14" cobalt blue mirror disc, with contrasting ebony painted ball feet finished with and 3 chromed bands or 'speed lines' dissecting the circular speaker + dial surround. The symmetric, geometric shapes and accent designs are distinctively art deco in appearance. Radio is in great condition and is free of chips, or cracks to the original cobalt mirror.  Mirror has not been re-silvered and shows signs of age + use that are accentuated by the studio photos. Mirror retains the black textured paint on the backside. Wood body (not bottom) and ball feet have have been resprayed in ebony paint. Chrome trim and knobs are original to the radio and show some pitting and scratches. Beautiful marbled celluloid dial is bright and perfect as is the original dial pointer. Radio retains the original back panel with 'Bluebird Model 566' stamped in white.  Grill cloth is a close replacement to the original. This is a prime original example of a highly sought after Art Deco radio that is matched by no other manufacturer in its flair and presence. Radio measures approximately: 14.5" high by 7" deep. This set is sold "as-is + untested", the chassis seems complete. Set is being sold as a "non-working" vintage electronic device that should be gone over by a qualified technician.