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Cerwin Vega Vega 3204
Cerwin Vega Vega 3204
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Old 13th September 2020, 02:06 AM   #1
caraudioguy2100 is offline caraudioguy2100
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Default Cerwin Vega Vega 3204

This amp isnít producing any positive regulated voltage.

I removed the opamps since 1 of them was defective and still couldnít get the +15 volts .

All opamps for this amp still have voltage on all pads even after they have been removed from the board .

I removed the regulator also and all 3 pads for the regulated have voltage on them .

Any ideas ?
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Old 13th September 2020, 02:24 AM   #2
Perry Babin is offline Perry Babin  United States
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Do you have any DC voltage on the RCA shields or on the non-bridging speaker terminals?
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Old 13th September 2020, 02:31 AM   #3
caraudioguy2100 is offline caraudioguy2100
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I have voltage on both .

I have 2 volts on rca shields and on non bridging speaker terminals
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Old 13th September 2020, 02:32 AM   #4
Perry Babin is offline Perry Babin  United States
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OK. Ground the non-bridging terminals and post the DC voltage on all terminals of one op-amp and the all terminals of both regulators.

In the future, don't just say that you have voltage on a point without posting the voltage that is on those points.
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Old 13th September 2020, 02:47 AM   #5
caraudioguy2100 is offline caraudioguy2100
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NE5532
Pin 1:0.00
Pin 2:0.00
Pin 3:0.00
Pin 4:-14.72
Pin 5:0.00
Pin 6:0.00
Pin 7:0.00
Pin 8:14.75


Q20 2N6488:

Base:15.15
Collector:30.21
Emitter:14.76

Q21 2N6491

Base:-15.23
Collector:-30.24
Emitter:-14.78

This is with the non bridging speaker terminal grounded
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Old 13th September 2020, 02:56 AM   #6
Perry Babin is offline Perry Babin  United States
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What's the problem? All of that looks OK.
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Old 13th September 2020, 03:02 AM   #7
caraudioguy2100 is offline caraudioguy2100
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If I take the ground off the non bridging speaker terminal I lose the +15 volts on the opamps
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Old 13th September 2020, 03:11 AM   #8
Perry Babin is offline Perry Babin  United States
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Do you only lose the +15v on the op-amps?

What other voltages change compared to the voltages posted on #5?

What happens if you plug in a signal source with a grounded shield, instead of grounding the speaker terminals?
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Old 13th September 2020, 03:15 AM   #9
caraudioguy2100 is offline caraudioguy2100
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If I plug in the signal source I get the 15 volts on the opamps .

Wondering in these amps are the regulators supposed to get to hot to touch ?

And I guess I have to use the non bridging speaker terminals in This amp to get the correct readings and not use main ground when testing the regulated voltages
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Old 13th September 2020, 03:17 AM   #10
Perry Babin is offline Perry Babin  United States
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What other voltages change compared to the voltages posted on #5?
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