Peavey Forum

SOMETHING has to be different, they are not into being mysterious, but I don't know what it might be. Both are described as having 10" woofer with tweeter. On my dealer support portal the schematic file is labelled KBA30_KBA50, so they share a circuit/board at least.

ON a channel you hsve twelve bbig transistors...TO3. Most of them are 8332 abd 8333. Those are outputs. Near the center are two different TO3s a 6506 and a 6507. Those ar the drivers. There is a 22 ohm 1w resistor near each one, near the 10 watt guys.

You can't damage amps by running high gain FX into the front. All it does is distort. The main output is 8 ohm tap, but the inner speakers are a 4 ohm combination. BUT THAT IS OK, it rarely affects an amp to be "off one notch" on impedance. However, the AUX jack is a 4 ohm tap, so if it makes you mo...

TL072 and 5532 are both op amps. The 87478 or 13080 are not op amps. Three dual op amp ICs on the board plus the one other, which is an OTA. SAC187 - think of them like seat belts in your car. You want them there, but while working on the car, the belts do not have to be there. The car will work fin...

Those two resistors are dropping resistors for the zener regulated 15v supplies. It is normal for them to heat up. Um, your speaker wires are noy connected to the board. With the board out like that, do not let the back of it touch the metal chassis. Also do not operate the amp like that m0re than a...

Stop. Don't throw parts at it. You look to have different ICs on th board, but chances are real good the amp used to work with those in it. 5532 and TL072 are both dual op amps. They will function in one another's place. The 5532 is nominally a lower noise part. Note in the schematic the 5532 are in...

If it makes sound it is likely fixable. We just need to track down where the noise is coming from. Likely a failed semiconductor or two.

There are only two sizes of basic fuse that we see normally. Peavey never uses weird fuses, they try to make everything serviceable. I call them big ones and small ones. The small ones are the 5x20mm fuses, common in Europe and the world. And the big ones are the 1/4" x 1-1/4" fuses common for decad...

Common 4A slow fuse, looks like the AMplified Parts option is the better deal. I see no reason to pay $5 per fuse.

Your photos show a 20mm fuse sitting in a 1/4"fuse holder.

8A fuse is for 120v units, 240v units need 4A fuse, yes slow blow 4A.

The headphones and speaker both use the same power amp circuit. The phones jack just has a resistor in the ground return to reduce the level. My suspects are either the jack, or the speaker itself. Does the speaker cone move freely? Disconnect the speaker and connect some other speaker in its place....

You miss my point. I don't care if you USE the phones jack. That jack however has speaker cutout contacts, and if they get iffy, your speaker will either cut out or drop in volume o thin tone.

No FX loop, but you have headphones jack? Dirty contacts inside a phones jack can cause such.

Um...

Well I WAS going to say one of the ICs on the volume board was likely bad, but if you now get 11v even with that volume board out of circuit, I am not sure what you have.

Could CR6 cause a low voltage? Certainly. It is a 15v zener, but if it doesn't "zene" at 15v, your supply goes wrong. A zener is a diode first. SO it needs to check one way and not the other like any diode. But it works by a controlled voltage breakdown in the reverse direction. If you exceed 15 v a...