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Cerwin Vega Vega 3204
Cerwin Vega Vega 3204
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Old 13th September 2020, 02:22 AM   #11
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Nothing has changed .

I was using amps ground terminal as ground reference at first so I had 2 volts on pins 1,2,3,5,6,7 of the opamps .

If I use the secondary ground all voltages are correct and pins 1,2,3,5,6,7 remain at 0.00 volts
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Old 13th September 2020, 03:00 AM   #12
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
It's normal for regulators to get hot.

Some amps have an isolated secondary which prevents measuring voltage using the primary ground.

From the information that you've provided, I don't know why the +15v would be the only missing voltage when measuring the voltage using the primary ground.
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Old 16th September 2020, 03:10 AM   #13
caraudioguy2100 is offline caraudioguy2100
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Back to this amp once again .

I replaced the positive regulator and an opamp .

Now this amp lokes to burn up the transistor and resistor connected to pin 8,11,12 of the 494 Itís burnt up twice now


Any ideas why this keeps happening
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Old 16th September 2020, 03:19 AM   #14
caraudioguy2100 is offline caraudioguy2100
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Never mind I figured out why it keeps burning
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Old 16th September 2020, 04:18 AM   #15
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Ok got a question .

The power light on this amp consists of 5 light bulbs the originals looked like incandescent light bulbs . They were all burnt out .

I swapped them over to leds and now get the transistor that controls the 13 volts to pin 8,11,12 of the 494 to burn and blow apart .

Could switching the incandescent bulbs over to leds cause this issue ?
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Old 16th September 2020, 04:30 AM   #16
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Sure if you didn't include a current limiting resistor.
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