This amp also is not producing +-16v regulated voltage and instead has +-2.5v. Rail voltage is +-40v. The regulated voltage is produced from rail through two pairs of 160ohm 5W parallel resistors. Mid-step I measure +-26v, but on the side which connects to all other components such as opamps, diodes, and the gambit I'm only getting the +-2.5v. Just after the 5w resistors theres a couple unknown diodes possibly 16v zener I guess.
It would appear that this amp may be muting by way of regulated voltage drop down but I am not 100% sure. Theres an optocoupler mid-board next to several diodes near the rail caps. No small transistors, diodes, and other tested components are coming up as concern. The amp was re-capped and aldo BurrBrown converted for the 2 OpAmps near the speaker terminals.
What holds the regulated voltage down in this amp?
It would appear that this amp may be muting by way of regulated voltage drop down but I am not 100% sure. Theres an optocoupler mid-board next to several diodes near the rail caps. No small transistors, diodes, and other tested components are coming up as concern. The amp was re-capped and aldo BurrBrown converted for the 2 OpAmps near the speaker terminals.
What holds the regulated voltage down in this amp?
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Dang.
Infrared heat scanner found one of the BurrBrown opamps heating up to ~140F. The previous tech socket'ed it. I pulled it and regulated voltage is now restored to all components.
BB OPA2132P
One of these is still working.
The rest of the amp has about ~6 or so BA4560 opamps.
I'm going to try putting TL072 in for further testing. I dont have any BurrBrown units.
Infrared heat scanner found one of the BurrBrown opamps heating up to ~140F. The previous tech socket'ed it. I pulled it and regulated voltage is now restored to all components.
BB OPA2132P
One of these is still working.
The rest of the amp has about ~6 or so BA4560 opamps.
I'm going to try putting TL072 in for further testing. I dont have any BurrBrown units.