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Philco Model 20 distortion
#5

The output stage (71As) relies on the big wire-wound resistor for its biases.


The sections are 1-2 and 2-3 (1.4 KOhm and 187 Ohm respectively). Rarely changes value, but does burn.
In my 20 the 1-2 section (1.4K) was burned out. I put a 10 Watt resistor in there.


Messages In This Thread
Philco Model 20 distortion - by 93foxconvert - 04-15-2012, 10:34 PM
RE: Philco Model 20 distortion - by 7estatdef - 04-16-2012, 08:17 AM
RE: Philco Model 20 distortion - by morzh - 04-16-2012, 12:42 PM
RE: Philco Model 20 distortion - by Chuck Schwark - 04-16-2012, 01:18 PM
RE: Philco Model 20 distortion - by morzh - 04-16-2012, 03:19 PM
RE: Philco Model 20 distortion - by 93foxconvert - 05-06-2012, 12:21 PM



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