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Loose Radio Part? |
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6614 |
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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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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3760 |
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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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george w
Supporter of TheAMCForum Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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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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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6614 |
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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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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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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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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1663 |
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There would be two output transistors for one speaker?
J
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george w
Supporter of TheAMCForum Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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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
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1663 |
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The radio pictured is a little different than my radio there are two of the parts circled in green on the front of my radio, the loose part is more of a copper color also it doesn't look to have been soldered in.
J Edited by JGRANTAMX - Jan/06/2022 at 6:38am |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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I think it should be located at the end of the tuning knob shaft. I drew very thin lines ending where approximately I think the spring clip should live. That looks like a phosphor-bronze spring clip to me, not plain copper. Just an educated guess, from taking apart too many radios... I could easily be wrong of course. Edited by tomj - Jan/05/2022 at 11:40pm |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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troutwilly
AMC Addicted Joined: Sep/14/2007 Location: Carriere, MS Status: Offline Points: 991 |
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What does the other side of the copper strip look like? Is it possible its the center contact for the antenna? I know you said it works, but stranger things happen. I was also thinking, is there a way it could have gotten into the radio through a slit/opening in the cover? If yes, maybe it fell from something above the radio.
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Bill O.
70 AMX |
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