Bias adjustment Graaf GM-20

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

Hello all,
I recently bought a Graaf GM-20 OTL amp. It sounds fantastic so far. I am still waiting for my BAT pre-amp, that would "finalize" my system.
My question regards the bias settings for the tubes (6C33C). The distibutor has a kind of service to bias the amp for you for free, only the power tubes are quite expensive at 100 dollar each.
So I ordered the tubes (6C33C-B) myself in Russia at 10 dollar. Does anyone have the instructions to bias this amp myself?
My questions are:
- Is it absolutely necessery to match the power tubes, or can they be biassed per tube?
- What is the bias current
- are there other point that I have take notice off?
Thanks in advance,
Ed
The Netherlands

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Topic - Bias adjustment Graaf GM-20 - edje999 11:41:45 04/06/05 (5)

Re: Bias adjustment Graaf GM-20 - vince.s 03:09:04 05/05/05 (0)

Re: Bias adjustment Graaf GM-20 - papworth 06:09:09 04/08/05 (3)

Re: Bias adjustment Graaf GM-20 - proac@operamail.com 07:18:28 04/08/05 (2)

Re: Bias adjustment Graaf GM-20 - edje999 03:18:47 04/18/05 (1)

Re: Bias adjustment Graaf GM-20 - Fosse 05:05:00 06/14/05 (0)

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