Loud hum from Peavy Nashville 112

[John Larson]

I get a loud hum from my Peavy Nashville 112 when the rever or effects loop is on. Normally there is no hum on turning on the spring reverb is when the hum starts. Turning on the effects loop makes it louder.
This is even present without the instrument connected to the amplifier.

I've tried plugging the amp into a hum x that didn't work.

What could cause this?

If I unplug the effects loop the hum from that goes away but the hum for the reverb is always present.

I'm out of ideas as to what could be causing this.

[Dave Magram]

Many years ago, I had a similar problem with a Peavy Nashville 112.

As I recall, I disconnected the wires to the reverb tank and cleaned the RCA plugs and jacks in the reverb tank with contact cleaner.
Then I slid the amp out of the cabinet, opened up and cleaned both sides of the Molex connector with the wires sending the signal to the reverb tank.

I think the plugs get a bit of oxidation over time that causes the hum.

- Dave

[Jack Stoner]

The NV112 does not use a Molex connector for the reverb connections. It uses a different, more reliable connector.

It does have two Molex connectors in the power supply section. Reseat (unplug and plug back in) those two connectors - obviously with AC power disconnected.

[John Larson]

Many years ago, I had a similar problem with a Peavy Nashville 112.

As I recall, I disconnected the wires to the reverb tank and cleaned the RCA plugs and jacks in the reverb tank with contact cleaner.
Then I slid the amp out of the cabinet, opened up and cleaned both sides of the Molex connector with the wires sending the signal to the reverb tank.

I think the plugs get a bit of oxidation over time that causes the hum.

- Dave

Do you mean the wires on the tank side? Or the wires that connect to the board?

I reseated the ones on the board side and it didn't seem to improve the hum.

The hum from the loop is slightly higher pitched than the hum from the reverb. I don't think it's a pedal problem cause it hums with just a cable from send to return if I turn on the loop.

[Ron Pruter]

John, I had the same problem. All of a sudden it just stopped being noisy...????? Ron

[John Larson]

So I've narrowed it down that it really isn't the amp but probably some combination of the very microphonic single coil pickup that Jackson put in my Maverick and maybe the lights in my music space. I have near zero noise with the Rondo music SX 6 string lap steel that I put a lace alumitone in and the exact same rig.

Thanks to everyone who tried to help. This also explains why the high gain input makes it substantially worse with my PSG. So now it's on to figuring out how to put a humbucker in the weird rout that is in my Jackson.