Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Ambugaton on September 21, 2016, 11:36:18 pm

Title: Preamp grounds
Post by: Ambugaton on September 21, 2016, 11:36:18 pm

Hi, on the Deluxe Lite I built I have the input/preamp sections on the same ground bus but I did not connect it to chassis. I have experimented with connecting this to chassis or not and I am not sure of any difference... but I suspect that it causes some reduction in ugly/blocking distortion. These are all speculations.... anyone know for sure what takes place with/without?

Title: Re: Preamp grounds
Post by: sluckey on September 21, 2016, 11:44:24 pm

If the buss is connected to the input jacks then the input jacks are providing the chassis connection. This should be fine as long as the jacks are tight. I like to connect the buss to a dedicated chassis lug very close to the input jacks so I don't have to rely on tight jacks.

Title: Re: Preamp grounds
Post by: Ambugaton on September 22, 2016, 12:57:00 pm

Once again completely overlooked something that was too obvious... input jacks.

I'm getting a slight bit of fizzle that gets stronger and weaker depending on how aggressive I play. It does not sound like bacon frying that I've read about, more of a relatively quiet fizz that will come and go as I let a note ring.