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In the Forum: Melquiades Amplifier
In the Thread: To drive the 6C33C...
Post Subject: I think it was fine solution.Posted by Romy the Cat on: 11/10/2010
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 N-set wrote: |
| Romy, may I ask you why you've employed an autobias on 6E5Pin Milq's MF rather than your biasing technique (if there is any reason at all)? |
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If you look at the page #13 of the Milq DHT thread then you will see that the first 12 drafts of the DHT Milq were with my typical biasing technique – a resistor in grid. Knowing your agenda I assure you that I went for auto bias not because the consideration of stability. In case of DHT I do not drive 6C33C with 70-90V of bias but a flimsy DHT with sub 40V bias. The full blown 6E5P has 32 times gain, with a good input voltage I was in danger to drive my DHT to class A2 – something the I did not want to. The option was to go for different type of driver tube with less gain of to go autobias on 6E5P. The autobias is very bad configuration as it employs a cap on cathode – very bad for sound. But if you look my autobias then you will see no cap. With no shunting capacitor on cathode a tube loops gain a lot – which was exactly what I was needed for my driver tube. So, I have the autobias but with no capacitor in cathode. This taupe of autobias is not different then my “typical biasing technique”. In my typical biasing technique a signal flows across a single resistor. In my version of the autobias the electrons flow to cathodes from ground comes also across a very small resistor. I think it was fine solution.
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