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Antique Radio Technical Forum
Delco DS-501 Transistor Convector: Fabricate my own? (pictures)

Posted by mike banner on 07/16/2011 18:21

:::I will add that Delco was notorious for using inefficient single-ended "class-A" output circuits. Being a stereo- those are likely two single-ended outputs rather than a push-pull. And they draw about an amp a piece idle current(!) and probably put out no more than 3-4 watts per channel. A terribly inefficient design by today's standards.
:::
:::
::::Anybody heard of Delco DS-501 transistor or know if there is an 'equivalent' available? (cheap?)
::::
::::I have an old early 1970s (72-76) GM Delco AM/FM car radio/stereo that requires an external 'convector' (called that by Delco radio repair book). I do NOT have this convector for the radio. See pictures: It's a large external alum heatsink w/ two(2) large DS-501 transistors on it along w/ a pair of caps.
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::::I wonder if I can fabricate an equivalent unit out of modern transistors? A heat sink and the caps shouldn't be a problem. I'm guessing all I need is a pair of large Delco DS-501 transistors or modern equiv mounted heatsink and 6 wires (3 for each transistor) going to the radio unit. The problem is that DS-501s are not growing on trees AFAIK. That's why I'm wondering if a modern pair of transistors could be substituted?
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::::If it helps... it's obviously a 12V radio and requires 10 ohm speakers (8 ohm will do).
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::::I have access to one such 'convector' I can inspect. I've cleaned the radio up and it works great w/ the 'borrowed' convector.
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::::Here are some pix...
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::::http://www.world-net.net/~toddh/converter1.JPG
::::http://www.world-net.net/~toddh/converter2.JPG
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::::thanks,
::::
::
:the speaker should be 3.2 ohms...because of limited voltage out, this load is critical to get full output. A similar transistor in the TO-3 case is the DS-503. Both are germanium aloy, 90 watt colector, and have been used in the same delco circuit design.
:
ds501 crosses to NTE105, ds503 crosses to nte121...

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Delco DS-501 Transistor Convector: Fabricate my own? (pictures) 
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