It works better on the latter due to less nfb
Master Volume pot
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Re: Master Volume pot
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Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
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Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
Re: Master Volume pot
Hi Mark,M Fowler wrote: ↑Wed Aug 05, 2015 4:22 pm
No I don't do much amp stuff anymore because of many health issues including my left ear finally decided it was tired and with years of multiple surgeries. It goes from no hearing to slight, ENT don't know what exactly is wrong.
The right ear is completely swollen shut with an infection but can't get back to ENT to get that fixed.
The tinnitus has increased dramatically too so for me to rely on my hearing to tune amps would be a joke.
Trying not to be too funny
I was looking in TAG for insights into Ken Fisher's amps and only now reading what you wrote in 2015.
I really hope you have solved those hearing problems, they are serious problems for everyone but especially for musicians.
many good wishes
Franco
franco mezzalira
Re: Master Volume pot
Wow I read what I wrote and yes the ears are better but hearing is muffled.
Been doing little amp stuff since we moved, no room and little energy. But still have the desire to build.
Perhaps lumber price will drop and get a shop built.
Mark
Been doing little amp stuff since we moved, no room and little energy. But still have the desire to build.
Perhaps lumber price will drop and get a shop built.
Mark
Re: Master Volume pot
Hi Mark,
wikipedia writes that the country you live in has 189 inhabitants, wow, it's really very small and I guess you all know each other. I live in Resana (TV) a town in northern Italy. Resana has 4500 inhabitants but a few chilometers away I have four large cities, Venice, Padua, Vicenza, Treviso.
I hope you can build the shop you want soon and I am pleased to read that your hearing is getting better.
I wish you every luck.
Franco
franco mezzalira
Re: Master Volume pot
Thanks Franco, I love small communities, no hassle or problems.
Mark
Mark
- Ledvedder5150
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Re: Master Volume pot
Sorry, I realize this is an old thread. But I'm thinking of trying a ppimv in my Liverpool build. I'm curious if any has had decent results. I do use a power station attenuator, but thought it might be useful to also have the ppimv option in a pinch. Where do they sell 3/8" 250K linear dual pots? Also, I read somewhere that it's useful to add a cut control to adjust when using the ppimv? Where is this documentation?
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Re: Master Volume pot
I don't know where you are loaded but Amplified Parts has dual 250k Audio pots. https://www.amplifiedparts.com/products ... audio-dual
Classic Vox cut control is just a 250k linear pot wired as a variable resistance in series with a 2n2 cap across the output tube grids, just before the grid stoppers.
Classic Vox cut control is just a 250k linear pot wired as a variable resistance in series with a 2n2 cap across the output tube grids, just before the grid stoppers.
Last edited by martin manning on Tue Jan 17, 2023 2:33 pm, edited 1 time in total.
- Ledvedder5150
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Re: Master Volume pot
It seems most are saying a dual 250k linear works better as a ppimv. And I thought the cut control uses 250k audio?martin manning wrote: ↑Tue Jan 17, 2023 2:26 pm I don't know where you are loaded but Amplified Parts has dual 250k Audio pots. https://www.amplifiedparts.com/products ... audio-dual
Classic Vox cut control is just a 260k linear pot wired as a variable resistance in series with a 2n2 cap across the output tube grids, just before the grid stoppers.
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Re: Master Volume pot
The 250k pot elements are replacing the 220k grid leak resistors, so 250k is the closest value, and then when you add a 2M2 safety resistor the effective value is 224k (if the pots are really 250k). AC30 seems to have a log pot for the cut, but my Express has a linear, which works well.
- Ledvedder5150
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Re: Master Volume pot
Has anyone had good results with one in a Liverpool or Express?
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- martin manning
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Re: Master Volume pot
The PPIMV? Yes, my express has one, and it works well.
- Ledvedder5150
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Re: Master Volume pot
Do you have a cut control as well?martin manning wrote: ↑Tue Jan 17, 2023 4:35 pm The PPIMV? Yes, my express has one, and it works well.
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- martin manning
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Re: Master Volume pot
Yes, that is how I learned that the cut compliments the PPIMV.
- Ledvedder5150
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Re: Master Volume pot
I'm assuming it's similar to this setup?martin manning wrote: ↑Tue Jan 17, 2023 5:37 pm Yes, that is how I learned that the cut compliments the PPIMV.
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