GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Melquiades Amplifier
In the Thread: A different breed of 6C33C amplifier.

Post Subject: It will wary with implementation…..Posted by Romy the Cat on: 3/14/2012

I see now. Quad can’t be driven by single 6C33C. This is well know fact and I did a lot of experiments with Quads and Lamm ML-2.0. For whatever reason as ML-2.0 drives Quads it produces Stingy Sound. I can’t explain it but it is not the sound that ML-2.0 and Quads are capable under the best conditions. When I sold my Lamm then one of my ML-2.0 was interned to by a guy from West who was a big Quads devotee. I did tell him many times that it will not sound as ML-2.0 is able to sound but he bought them anyhow. He reported that he loved it but I never believed him, or cared. Warn you that ML-2.0 runs global feedback and it has to be able to drive Quads better then something like Melquiades. I never tried Melquiades with Quads but I think ti will be even worth then Lamms.

Also about the sub 100H bass. For whatever reasons the amps with 6C33C are very sensitive to plate loading when they do lower bass. I have seen the situation that 1/2R of secondary impacted bass hugely.

Now about the “some sense of dryness”. Yes, I would confirm that it might be the case and in some designs 6C33C do have a tendency to sound like SS amp. I think it is a properly of des but the property of the tube. In fact I feel that it is in many cases the properly of the driver. If you make 6E5P-6C33C two stages then you will see that the amp has some dry SS feeling. Add to the amp the Melquiades-style biasing of the driver stage and you will get superb most feeling with bass 10 times better then it was with battery or fix-bias of 6E5P.

The Cat

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