Author Topic: Would 60's/70's car radios contain parts I could use to experiment with pedals?  (Read 1176 times)

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kimelopidaer

I've just been given four. One has tubes for sure (12x4) and the rest are transistor.

I'm beginning to experiment with circuits in a breadboard.

Manny

Hi,

Some of the transistors could certainly come in handy. Have you begun to de-solder any yet?
Let us know what's in there, maybe some gut shots?  :)

Manny

kimelopidaer

Ok
I will take a few of the best pictures and post them in a day or two

petemoore

  Any tube output works like tube output.
  I have 12x4 working unit upstairs [IIRC] someone changed the caps and let me pick it up. I put IEC=Ground chassis and Connectors on it, fired it up and it hums. Has AC supply though, layered-cobweb-of-hanging-garden circuit design.
  If it's a 'car' unit, that implies is 12vdc supply intention, running from a DC-Cell..seems like it'd allow very minimal B+ filtering, which should be taken into account if alternate PS is used.
  If using AC/DC conversion for the power supply, IEC it. Test that the chassis/earth is actually like bolt/lock-eyelet connected to actual Earth ground.
 Check for non-short then connect DC to the supply rails [observe/obey polarity], use a ~HD battery [to supply the needed current].
  Measure the current draw, will be much higher at tube start up, that'll take a 'gnaw' out of a wimpy powr suply every time too, you might not even get away with it many times.
  Then if it's working fine for a few good whiles [ie..how to lo-tech-pre-test a tube amp, try it while it's self-heating completely, check, check to see no redplating], and then it either sounds great and/or you then Have to mess with it anyway...
  Perhaps attain a more suitable power supply when the battery holds up the DC voltage for only so many whiles.
  Since I mention PS:
  TDSL the tubes, [don't overvoltage the capacitors] but consider the tubes are able to run within their parameters [AC/DC conversion rate, and PS loading/voltage drop etc.] before choosing an operating voltage.
  Then you will have to find 'the' speaker, and probably need or have a good one anyway so it's cool. Try selections if you can access pulls from old consoles, perhaps auto-speaker, the tone/effeciency may vary greatly.
  
  
  
« Last Edit: January 19, 2011, 09:34:00 AM by petemoore »
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newperson

Look them up for value.  Car collectors buy vintage radios for old cars.  They are more than likely worth more selling them for the 1-2 parts you might get out of them.  Then you can take that money and get whatever parts you are really looking for.