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Loose Radio Part? |
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george w 
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Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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 Posted: Jan/07/2022 at 3:38pm |
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The green circled parts are the power output transistors of the radio’s internal amplifier that power the speaker.
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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JGRANTAMX
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Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1694 |
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Posted: Jan/08/2022 at 11:18am |
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There would be two output transistors for one speaker?
J
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6PakBee
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Posted: Jan/08/2022 at 1:12pm |
Could be a Darlington pair.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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bigbad69
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Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6668 |
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Posted: Jan/08/2022 at 3:00pm |
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Could also be a push/pull configuration. Google "Class B amplifier" if you're curious. BTW, after re-reading the OP more carefully, I realize the question was with regard to AM/FM radios. The picture I posted was of an AM radio. That may also explain the absence of the aforementioned clip in my radio. Apologies for going on a tangent...
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69 Javelin SST BBO 390 T10
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george w
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Posted: Jan/08/2022 at 3:05pm |
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If there are two transistors then the answer is yes, two transistors for one channel of amplification. This is the more typical and preferred amplifier output stage configuration called “ push-pull “. One transistor handles the positive going portion of the signal and the other transistor handles the negative portion. The transistors may or may not be of the same type or part number. A single transistor ( or tube ) output stage design is called “ single ended “ and was used very early on in solid state design or on very low cost amplifier designs. Push-pull design is the better choice and is always preferred. Early Delco transistorized radios used single ended design.
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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Steve_P
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Posted: Jan/09/2022 at 8:44pm |
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68-70 AM used one transistor mounted on the RH side; AM/FM used two mounted on the front. FWIW. The transistors were also date coded.
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bigbad69
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Posted: Jan/09/2022 at 9:48pm |
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69 Javelin SST BBO 390 T10
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JGRANTAMX wrote: