Hoffman Amplifiers Tube Amplifier Forum
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Hoffman Amplifiers Tube Amplifier Forum
3h ago
In the context of a tone stack, they would be the the same thing.
A variable resistor would be set up by using the wiper contact and one of the fixed poles.
Most often (but not always!) in a tone stack, the "tone pots" are set up as dividers, where ..read more
Hoffman Amplifiers Tube Amplifier Forum
3h ago
You slide the metal band left or right to adjust.
..read more
Hoffman Amplifiers Tube Amplifier Forum
4h ago
Parts are on the way!
I lifted the legs on a bunch of components and took measurements. The other Mallorys are out of spec by 40-50% and there's a one suspect resistor.
Of course no 1 vendor had everything, but hopefully everything will be in place ..read more
Hoffman Amplifiers Tube Amplifier Forum
4h ago
Quote from: AlNewman on July 20, 2024, 12:11:54 am
One great mod is to change the stock tonestack into more of a vintage TMB style by changing the Mid pot to a variable resistor, and changing the values in the tone stack. Tha ..read more
Hoffman Amplifiers Tube Amplifier Forum
7h ago
Is the switch opening when you plug in the effects return? If not, it won't be disconnecting the pre amp ..read more
Hoffman Amplifiers Tube Amplifier Forum
7h ago
Quote from: EL34 on July 25, 2024, 11:35:03 am
You would have to parse the .diy file
That's how I get the DIYLC program to parse custom .diy boards on my web site.
Any idea as to the software I could use to do this? A ..read more
Hoffman Amplifiers Tube Amplifier Forum
7h ago
After thinking about this a bit, I figured that I can simply switch the amp chassis ground in isolation of the rest of the circuit. Yes, I know that Doug offers a handy-dandy PCB arrangement that probably works real well, but I like to make my own stu ..read more
Hoffman Amplifiers Tube Amplifier Forum
8h ago
Quote from: Latole on July 26, 2024, 03:33:45 am
You need to use full bridge rectifier
If I use a bridge, will that mess with the chassis ground that I'm switching the tubes with? Attached is the schematic. I'm no lon ..read more
Hoffman Amplifiers Tube Amplifier Forum
8h ago
You might want to use relays for channel switching if you can’t find any vactrols (Vactrols that are made with cadmium aren’t allowed to be manufactured since RoHS ..read more
Hoffman Amplifiers Tube Amplifier Forum
9h ago
Not sure if this is the same model, but might help identify whether this is a design flaw, or just a flaw with your unit ..read more