Same guy, he changes his name every couple of years apparently to run from his reputation, but doesn't seem to change his buisiness practices.
Any Experience w Ebayer 'hifiaudio-' Need volume pot for HK A300
- Thread starter liteagilis
- Start date
Jack, this is an interesting observation, thank you so much. but may I ask what Scott volume control you modeled? if it was a 130 model I posted previously, does it mean that linear pots + law faking theory is correct and Mark Oppat is wrong saying that in most cases the pots were log? and I (and many others I think) can forget any doubts and assemble a linear pot?
here are some pics of the pots with 2 taps, they have nothing to do with anything I posted earlier, them are just to have an idea how do they look like. taken from ebay, I hope the sellers to whom they belong won't be too upset seeing them here.
I can't speak for "most cases." only this one. It's a 99.9% chance of being a linear pot. Problems like this are one reason I don't restore older preamps and receivers. There are better and less frustrating ways to build an audio system. In any event, I would solve this problem in the Scott 130 by installing a 500K log pot and applying the Steve Bench "reasonably well-compensated" loudness circuit to the switch. Even if the loudness circuit this creates isn't identical to the original, at least the switch won't be dead, plus you'll have a brand new, good quality volume control.
Loudness Compensation
Jack
Loudness Compensation
Jack
Jack, your help and good will is truly incredible.
you are absolutely right about "better and less frustrating ways", but it is more of collector`s question than audio, and a matter of principle to finish the rebuilding project I already spent 2 years on (selecting caps, resistors etc.), and despite that I replaced 90% parts in it, the cirquit itself remains original and I won`t change anything in it. for example: surely you`ll recognize very good Bourns cermet pots, but they don`t manufacture them with ribbed shafts, so I made it myself for Grommes-209 bass and treble, fortunately there are no extra taps in originals.
but in general yes, the best way to obtain the best preamp is to build it yourself using parts and tubes whatever your heart desires.
you are absolutely right about "better and less frustrating ways", but it is more of collector`s question than audio, and a matter of principle to finish the rebuilding project I already spent 2 years on (selecting caps, resistors etc.), and despite that I replaced 90% parts in it, the cirquit itself remains original and I won`t change anything in it. for example: surely you`ll recognize very good Bourns cermet pots, but they don`t manufacture them with ribbed shafts, so I made it myself for Grommes-209 bass and treble, fortunately there are no extra taps in originals.
but in general yes, the best way to obtain the best preamp is to build it yourself using parts and tubes whatever your heart desires.
Nice work, very clever! This technique could also be used for Alpha pots with shafts that are too short, or to convert control shafts between 6mm and 1/4". Using a setscrew as a splice produces a great final result!
Jack
Plimpington2
Super Member
Oh, I stand corrected. I would not have guessed that. I feel like I’ve not seen that before. I supposed it would have helped me to look at the schematic!! Ha!
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