Rerurn to Romy the Cat's Site


In the Forum: Melquiades Amplifier
In the Thread: A different breed of 6C33C amplifier.
Post Subject: Convince me.Posted by Romy the Cat on: 3/17/2012
fiogf49gjkf0d
 KOTriode wrote:
Ok, I just read your "Melquides Remote biasing". This technic can not be duplicate in my amp due to DC coupling, the C3G (I dont use 6E5P) driver stage basically adjust the 6C33C current in the output stage. Just for curiosity, I will build a mono block version Melquiades and compare with my version, I believe I have extra chassis for it.
The Melquides Remote biasing is not the Melquides but the idea to use the positive side of biasing to pressurize interconnects with voltage, thus the Remote past comes from. To try the Melquides biasing feel free to discard the biasing PS. You would need 400V to drive the 6E5P, so use the very same supply as you use for driver tube, juts drop voltage to ~ 190v to light up the 150V gas tubes. Evrything after the points B and C on the schematic is important. Do not change the value of C4 and C5 and keep R4 and R6 as high as you can.  By biasing with grid resistor we eliminate the cathode bypass cap (always horrible for sound) in case of cathode biasing, the grid cap in case of fix biasing or grid battery that has a whole array of own problems. The miller capacitance of 6E5P is low as it looks like the grid impedance do not form filter with it that too auditable. The 6E5P has own unique sound that I happens to like but the key in there the gas tube biasing. The gas tubes damp reflections of currents from the 6E5P grid and make the tube sound very luxurious and pliable, it also create very different bass.

The reason I do encourage you to assembled a prototype of Melquides and to give it some listening test is because I find it would be interesting to have some reality check and to see how the my version of 6E5P-6C33C would stand against alternative to drive 6C33C. I do not mind somebody find better single-stage driver 6C33C and I do not mind to use the efforts and time of others to propel the journey. I do feel that anybody who would like to drive 6C33C with one stage have to listen what Melquides. I might be wrong, convince me.

The Cat

Rerurn to Romy the Cat's Site