Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: Rontone on June 13, 2026, 07:28:35 am

Title: What's this circuit for added to the ground on my A/B/Y Switching Box?
Post by: Rontone on June 13, 2026, 07:28:35 am

So I got this Torres Amps switching box, it was sold as working but the battery inside had leaked so I opened it to refurb it

Across the ground tabs from the input to the "B" channel output jack [which is plastic isolated type] has this assembly of 3x 33ohm resistors, 2x 1N400* type diodes and a 104 Poly cap, all in parallel [diodes in anti-parallel...]

The input and channel A both have switchcraft jacks, so the grounding connects through the box, is this there as a filter or ground loop isolation or both?

Title: Re: What's this circuit for added to the ground on my A/B/Y Switching Box?
Post by: Rontone on June 15, 2026, 07:58:28 am

Ah, this does seem to be a ground loop breaking circuit, its come apart fine so I'll stick it back together with a fresh cap and diodes

Picture schematics taken from these sites:-

https://www.circuitbasics.com/product/ground-loop-breaker/ (https://www.circuitbasics.com/product/ground-loop-breaker/)

https://electronics.stackexchange.com/questions/737539/safety-about-self-designed-ground-loop-breaker-circuit (https://electronics.stackexchange.com/questions/737539/safety-about-self-designed-ground-loop-breaker-circuit)