GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Melquiades Amplifier
In the Thread: More 6E5P-6C33C amps.

Post Subject: A TV single in SET amplifier.Posted by Romy the Cat on: 11/15/2010

Panos,

it is not about convincing me. My standing is absolutely irrelevant in this subject – I do not sell audio and do not making living by evaluation of SET amplifiers. I report what I have witnessed, nothing more. Sure, it is very possible that you use the winding technique that took the 6C33 transformer response to be able to transmit TV single and this is fine. I did not see and I do have some suspicions (circumstantial suspicions I have to admit) that response of your amp is not as wide as you described. For instance any person who does measure the FULL power response would not care about -3db but would care where the transformer only begin to roll off, sort of proverbial 0.1dB. Anyhow, your transformer does whatever it does, so good for him, but I think I am within my constitutionals rights to have my suspicions, am I?

Yes, the 6C33 has low plate impedance. Not always “sub 100ohm” and to be sub 100R you need to fry it at 320-330 mA. All that it does makes the transformer to have less turns with all consequential benefits. So, you have no cupper and less ability to grow inductance for LF, so you need a larger core mass. The larger core mass make larger winding with filling and spreading problems as there are not a lot of turns. Anyhow, I of course still admit the lower plate impedance tubes allow to have wider bandwidth of OPT but I would also insist that it has no practical significance. The low Rp 6C33 with 500kHz DSET transformer would not sound as interesting in HF as type 10 tube with Rp sub 10.000R and a transformer that would have a millions turns. so, it is not as straight forward.

In context of this thread – I do like the 6C33 and since for you the interaction at this site has purely marketing objective I wish to your amp a worm reception and good sale. Honestly, if I had it them I would try the 6E6P instead of 7721, but this is me and I like the 6E5P/6E6P sound….

The Cat

Rerurn to Romy the Cat's Site