Need help with a Gibson GA-50T Amp

[dwestover]

I just picked up a Gibson GA-50T. It had been in a storage and contained a large amount of rat droppings on the bottom side of the chassis. The chewing damage seems minimal with the exception of the wire wound resistor which is chewed to the point of not having any markings.

Can someone tell me the value of that resistor? It sits right next to the large transformer.

The other thing that I found was a .01 Capacitor laying in the bottom of the case. I found it on the schematic, but was hoping someone could tell me where it physically goes.

Thank you in advance.

[Mick-7]

Here's a schematic for it: Gibson ga50t.pdf

[Sam Sherry]

I just picked up a Gibson GA-50T. It had been in a storage and contained a large amount of rat droppings on the bottom side of the chassis. The chewing damage seems minimal with the exception of the wire wound resistor which is chewed to the point of not having any markings.

Can someone tell me the value of that resistor? It sits right next to the large transformer.

The other thing that I found was a .01 Capacitor laying in the bottom of the case. I found it on the schematic, but was hoping someone could tell me where it physically goes.

Thank you in advance.

HEY, WELCOME HERE!
Hi, I'm nobody in particular around here. But nobody has said welcome yet, so please feel welcome!

+ + +

Most guitarists can't look at a schematic and translate it to a layout at the drop of a hat.
But the fact that you are apparently in the same spot as most guitarists lands you a visit with the typical advice. That's this:

It's statistically likely that you won't kill yourself poking around in a tube amp but it's not impossible.
Since you asked for help figuring out what goes where, this is probably a good time to drop the amp off with a tube-amp repairer.

It is pretty likely that even if you figure out what's supposed to go where, your caps are old and toasted.
That means turning on the amp without either a Variac or at least a light-bulb limiter actually could cause further damage, extending as far as "cook the amp."
This would be a good time time to drop the amp off with a tube-amp repairer.

Lastly, sincere good luck with the rat poop.

Here's hoping it's back, clean, fixed and sounding like music real soon.

[Jimmy Mack]

What Sam said! Welcome.

An old amp like that may not work all and even if you did re-locate the OLD parts, it probably won't work very well. Use caution when fiddling with it. Don't burn it up.

And you will get better service from a TECH, a repairman with experience and respect for an old amp like that. It's quite a find!

And you probably know this already, you will get better service if you take the time to clean out the rat droppings.

Best of luck with it.

[Mick-7]

Most guitarists can't look at a schematic and translate it to a layout at the drop of a hat.

I missed this comment by dwestover: "I found it (a capacitor) on the schematic, but was hoping someone could tell me where it physically goes" - so he's already seen the schematic, but I figured it would answer his question about the values of the resistors.

[Jimmy Mack]

Shock!!! I hope he's not trying to put it back where it came from????

And to dwestover: you have to consider all of the other caps and resistors that have drifted in value, leak, or otherwise just aren't up to the task.