Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Snake5150 on February 23, 2025, 03:22:32 pm

Title: Impedance selector wiring
Post by: Snake5150 on February 23, 2025, 03:22:32 pm

Stupid question.

After trying to not use an impedance switch and having a plethora of problems. I’ve decided to install one , few prolly dumb questions tho.

I have a 3 pole selector and only 2 tap? What safety resistor should I add to the third pole for momentary ot safety.

I’m only using 1 jack. The schematic shows the ot common going to one side of the cliff jack and the other side of that jack being a ground . Is this correct? Assuming the cliff jack doesn’t disconnect it?

Title: Re: Impedance selector wiring
Post by: SEL49 on February 23, 2025, 04:01:16 pm

Inspect your switch closely. Some of those three position switches have an adjustable stop that can be set to only allow two selections. Otherwise,

No safety resistor. I would just put a jumper between two of the selector lugs. Like this...