My VCA is toast, Help!

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altitude
 
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My VCA is toast, Help!

Post by altitude »

Was playing on it today and suddenly, crackle and bam no sound. Turned volume all the way up and I can hear the osc and filter working but there is tones of noise and distortion so this means my ba662a just bought the farm right? Or could it be something else?

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subatomic
 
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Re: My VCA is toast, Help!

Post by subatomic »

Altitude wrote:Was playing on it today and suddenly, crackle and bam no sound. Turned volume all the way up and I can hear the osc and filter working but there is tones of noise and distortion so this means my ba662a just bought the farm right? Or could it be something else?
so that means you still have your 6110? are they socketed, can you swap it in and see if it fixes it? seems that would answer the question pretty quick...

sucks to have that chip die... so with the 662 was it "more like a 303" than with the 6110?

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altitude
 
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Post by altitude »

um, the 6110 didnt make it off the operating table.

Is there anything else that can cause this problem thats prone to failure?

The difference in sound was negligible at best. Maybe a little noisier, but its kinda hard to tell so no real difference

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Post by Guest »

check to see that vca is still getting a gate signal
you can also check all the voltages at the various pins on the chip
to verify that the chip is indeed bad
there is a post somewhere that lists all of these voltages

did you use q1 through q4

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altitude
 
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Post by altitude »

Everything else seems to work since I can hear it (barely)

Didnt use q1-4

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Post by Guest »

the gate signal could be weak giving a weak sound output
is it just as poor out of both the headphone and mixout

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altitude
 
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Post by altitude »

Ok, got my surgury gloves on and thankfully had enough brains to save the 4 parts I removed when I installed the 662a and found my mangled ba6110 (4 pins broken off). Replaced the parts, did some creative solder sculpting and Viola! Problem still there (same thing).

Not the BA662a, thankfully. Did the normal procedure of reflowing everything and did a good going over with the techspray and FIXED!! So my normal "jump to the worst possible conclusion" reaction (I'm kinda a Nietzsche fan) proved to be a little hasty, which is normally the case.

Looked like something must have bridged or oxidized

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