Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Ash Telecaster on January 29, 2025, 11:38:56 am
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They say there are no dumb questions. I aim to prove how incorrect that statement can be!
First amp post! I am trying to create a hybrid monster. It is a Weber cab, chassis, transformers and a few other parts mixed with a Hoffman turret board and components. I didn't know about Hoffman until after I bought the Weber stuff. Otherwise I would have made life a lot easier on myself and gone with the Hoffman chassis, etc as well.
I have built 2 other amps previously, and miraculously, as I don't really know what I'm doing except on a fairly remedial level. I mostly get by on layouts and amp gut pictures. And that leads me to my first amazing, stupid, question!
I have attached a graphic illustrating my question. The effect jacks, in the layouts I see a ground specified. In 2 pictures I see no ground wire. The third pic shows a ground to chassis placed by the jacks. The last pic is a pre-amp ground placed by my input jacks.
I believe I should run a wire from my pre-amp ground to each of these jacks. Does that make sense or is there a better, more logical approach.
Thanks in advance to any who are gracious enough to entertain my very stupid question!
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a full schematic of what you're building would help. the 4 jacks "should" already be at ground, easy to test with ohm meter, one lead "outside shell" other to chassis, expect real close to zero ohms. IF they are "isolation jacks", then your schematic snippet does show them all grounded, so solder a wire at each ground tab on them, solder to bolted tab on chassis.
the input jack "tab" is just convenient, saves trying to put grounds onto the input jack so when it fails you don't have to unsolder a bunch of wires.
that "input jack" tab IS your preamp ground point, should ONLY be 1, that's it, don't forget to run a ground wire from input jack(s) to it also.
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Hey Shooter!
I totally get what you are saying. Thanks for that!
I'm attaching the full schematic.