Gary Pimm's battery biased mosfet cccs

[sparkle]

Hi guys,
I need help form someone that has build the sch. attached or from mr. Gary himself......
I would like to try it on my 12B4 preamp. But since I don't know much about this circuit I have a few questions.

First, mr. Gary uses 3.3V battery cells in the table in his article (from where I have the sch attached). I have 3.6V cells - and because of that I would need to adjust slightly the circuit. Would it be enough to use the same circuit as attached and adjust it with the pot as in the sch or should I change some values.?

Second, he has metioned that he uses 2,3 or 4 cells- I asume that he use them in series with. So if I would decide to use 2 cells I would need 4 battery cells for the whole circuit, right?

Third, and most important of all, what is the voltage drop across the ccs? Is it the same as in other revisions (150V)?

 

[sparkle]

Here is the table - also from the same article....

BTW, thanks for all Your replies if there would be any.😀

 

[sparkle]

Hi,
is there anybody that could answer my q's?

 

[grataku]

GP would probably be able to answer all your questions. Have you tried him?

 

[sparkle]

Hi grataku,
no I didn't since I know that mr. GP is very, very busy man. I thought that someone on forum might have played around with this type of ccs. So it seemed better to ask those questions here, on forum.....
best regards

daniel

 

[pedroskova]

You're more apt to find Gary if you ask over at the tube DIY asylum .

 

[sparkle]

Pedroskova, thanks - will also try there😉
regards