Need Schematic for Peavey JXS212

[JJK]

The Amp seems to be experiencing either a tube or capacitor problem. I'd like to trouble shoot it, but its a bit difficult without a schematic.

Does anyone have a copy they could share, or direct me to a site where I can see it.

[Jazz P Bass]

You may have to contact Peavey on this schematic request.
Post the scheme when you get it.
What is the problem or symptom you are experiencing?

[JJK]

Amp makes a crackling sound.
Eliminated guitar and cable as a source. Turned all potentiometer back and forth a few times and tapped them, but does not seem to be the problem.
When the amp is powered up without anything connected, random annoying cracks occur every few seconds.

The amp has qty 4 "12AX7" and qty 4 "EL34" tubes. The "EL34" can be replaced by "6L6GC" and there is tube type selector switch.

[Steve Conner]

Peavey give schematics on request for their products. Call their customer service.

[Enzo]

Or email customerservice@peavey.com

Never hurts to include your serial number in your request.

Install a different set of power tubes, and see if it still does it.

[Pedro Vecino]

click here

[JJK]

Thank you Pedro for the schematics. I contacted Peavey and they emailed me a package but your document is more legible.

Visual inspection of the Pre-Amp board revealed that C57 (4700 microF, 35V, filament supply filter) top was bulged out. Checked in circuit with ESR meter and appeared fine, but I removed it anyway and checked it out of circuit. The capacitance is ~ 4300 microF (with the 20% tolerance) and ESR is 0.16 ohm (this indicates a good capacitor). But I still don’t like the bulge, so I got another cap 4700 microF, 50V, and I intend to solder it in.

I also found another two capacitors (I think C61, C62, I have to check again, these caps are also part of the filament supply filtering circuit) which appeared bad while checking in circuit with the ESR meter. I will remove these caps from the board and re-test them.