Amp experts: Is there a fault with this cap?

[agedhorse]

Vintage Ampegs are done differently than most amps.

The cap can has an insulator between the can case and the chassis. The cap can case is connected to a ground bus that runs to the input jacks where it is grounded to the chassis. So the case is referenced to ground, just not directly. If the cap can is grounded to the chassis, because of the bus, there is a ground loop and hum. The bus to chassis ground can be at either end but not both. They choose to do it at the input jack end.

The V4B and some other of their amps stack two cap cans and the case is not referenced to the chassis. The cans have a heavy cardboard cover like you mentioned for protection against shock.

Right, the insulator I'd for ground loop isolation, but the cap is still referenced to ground, which is bonded to chassis ground somewhere in the amp (probably where the ground bus bonds with the chassis, the "star" point.

 

[beans-on-toast]

I’m glad that I’ll never be at the mercy of a tech. I tend to fix everything myself.

My wife is used to seeing anything new that we buy in pieces, like our last TV spread all over the living room floor before it was even turned on.

 

[BassmanPaul]

My wife is used to seeing anything new that we buy in pieces, like our last TV spread all over the living room floor before it was even turned on.

Did that do anything for the crappy programming?

 

[BassmanPaul]

Croaky Street! We never liked that show that much. The Rover’s Return wasn’t my kind of place.

 

[Mr. Foxen]

Where is this board people keep mentioning? If those caps are soldered to a PCB, I'd sure like to see it.

This is the OTR, but as can see from tickboxes, the bass one is laid out the same. Caps top left, and not on the board.