DIYHiFi.org

I came accross Machmats Auto Fixed Bias here: http://www.machmat.com/sales/kits/afb.htm and then stumbled on the Tentlabs Negative Bias modules here: http://www.tentlabs.com/Products/Tu...e24/page24.html

Is there any difference between the two? (apart from the Machmat product being less than half the price of the tentlabs version - (kit)€37.50*2 or (built)€60*2 compared to €179

What's the difference to CCS biasing on output stage?

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There is a crack in everything, that's how the light gets in!

Your Tent link does not work........

http://www.tentlabs.com/Products/Tubeamp/page24/page24.html

Guido's sounds more exotic. First one sounds like a servo, which Guido pooh-poohs.

Jocko

Blumlein's Garter biasing seems to be simpler and just as effective: http://www.tubecad.com/2005/May/blog0046.htm
Has anybody tries it? How much B+ is diverted?

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There is a crack in everything, that's how the light gets in!