Dynaco sca80-q question.

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#2
rman said:
Hi.

I was wondering what would happen if I tried to bypass the protection circuit on a dynaco sca-80q amp. If one where to short Terminals 6 and 8 on the power amp board and disconnect the leads from R16 and R17 would the amp still work? THe idea would be to reduce power consumption, and heat inside the unit.
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I think if you remove the protection circuit, the amp will fail sooner or later.
There are aftermarket replacement boards engineered to improve the amp without risking a melt down.
 
#3
You are probably right about risking failure. This is not an amp I use much,just playing with it. I want to keep the circuit mostly original. I have added a voltage regulator kit for the pre amps, and plan to recap the boards and so forth just because.

Thanks for input.
 
#4
rman said:
You are probably right about risking failure. This is not an amp I use much,just playing with it. I want to keep the circuit mostly original. I have added a voltage regulator kit for the pre amps, and plan to recap the boards and so forth just because.
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Yes, a blow up will cut down on the fun. Recapping this is very overdue, that should help a lot.
 
#5
Another Dynaco SCA 80 question . . .
The SCA 80 uses two diodes on its PC-18 boards. I don't know how to substitute them. The specification is "Silicon Diode: 0.8 volt Max Drop @140 mA " I thought silicon diodes were 1n**** format. Can anyone offer an interpetation? Please. The Dynaco Part Number was 544015 if that's any help.
 
#6
I was wondering what would happen if I tried to bypass the protection circuit on a dynaco sca-80q amp. If one where to short Terminals 6 and 8 on the power amp board and disconnect the leads from R16 and R17 would the amp still work? THe idea would be to reduce power consumption, and heat inside the unit.
Click to expand...

It will not work. It would take an under-biased amp with modest crossover distortion, and make it a horrendously under-biased amp with horrendous crossover distortion..

The SCA 80 uses two diodes on its PC-18 boards. I don't know how to substitute them. The specification is "Silicon Diode: 0.8 volt Max Drop @140 mA " I thought silicon diodes were 1n**** format. Can anyone offer an interpetation? Please. The Dynaco Part Number was 544015 if that's any help.
Click to expand...

If you need to replace D2 and D3, you can use 1N4004 diodes (1 for 1 replacement). The typical curves show 0.8V at 140 mA.

Update My Dynaco
 
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