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Old 1st April 2013, 03:14 PM   #1
jrobson is offline jrobson  South Africa
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Default active bias supply?

Anyone ever tried this?
http://www.diyhifisupply.com/files/ABS1.1.pdf

Would this be the correct way?
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Old 1st April 2013, 04:18 PM   #2
jrobson is offline jrobson  South Africa
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Sorry cathode should be connected on the other side of the resistor.
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Old 9th April 2013, 05:13 PM   #3
ORNJ is offline ORNJ  United States
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So this essentially would making adjusting the bias every time tubes are changed to be a non-issue?

I am really interested in getting some TSE boards because of the ability to adjust the bias on them to extend tube life and increase in sound quality.

With the boards being as reasonably priced as they are, I can get several of them and build them over time for myself and loved ones.

I had intended to "mimic" the decware with the VU meters on the top plate to show the bias so I know it is running optimally.

I hope I can build one though, I have built a bottlehead quickie and then I have also build computers and worked welded for years, and worked with high voltage electronics before, so the electricity doesnt scare me....just my intelligence.
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Old 9th April 2013, 05:16 PM   #4
jrobson is offline jrobson  South Africa
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Correct, once set it will always run at that bias, but it will probably be better not to remove the entire circuit like I did at ABS Input and just replace the Bias bit(Bias 1).
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Old 9th April 2013, 05:21 PM   #5
ORNJ is offline ORNJ  United States
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interesting.

However, would you still have to adjust if you changed the type of tubes you were using?

2A3 to 300B for instance?
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Old 9th April 2013, 05:26 PM   #6
jrobson is offline jrobson  South Africa
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You set it, it keeps it, different tube types requiring different bias will need adjustment.

Last edited by jrobson; 9th April 2013 at 05:42 PM.
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Old 9th April 2013, 05:41 PM   #7
ORNJ is offline ORNJ  United States
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Ok great, I just wanted to make sure I understood everything about it properly.

I was turned onto tubelab stuff by Evenharmonics in a thread where i was talking about using tubes in a home theater...the TSE looks like a great way to go but I am also considering the SSE...maybe i'll get one SSE for practice and gift it out and keep the TSE for myself....
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Old 9th April 2013, 05:48 PM   #8
ORNJ is offline ORNJ  United States
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Ok great, I just wanted to make sure I understood everything about it properly.

I was turned onto tubelab stuff by Evenharmonics in a thread where i was talking about using tubes in a home theater...the TSE looks like a great way to go but I am also considering the SSE...maybe i'll get one SSE for practice and gift it out and keep the TSE for myself....
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Old 9th April 2013, 05:49 PM   #9
jrobson is offline jrobson  South Africa
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I might try it when I do the GM70 update, will report back if I do.
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