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In the Forum: Melquiades Amplifier
In the Thread: A different breed of 6C33C amplifier.
Post Subject: Feedback to the 6C33C review.Posted by Romy the Cat on: 3/14/2012
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 KOTriode wrote:
On dynamic, the 6C33C tube showed its ability to go deep in the bass on Ray Brown trio recording of Soular Energy which is excellent for a 15W SE , the 845 amp can do better, but not by much, but probably because of its 25W output give it more headroom than the 6C33C. .

I do know the sound of 845 and 211 tubes and I feel that properly implemented 6C33C shall way over-perform them in dynamic and bass. The advantage that 845 has is by the fact that it is a 845 direct heated tube and by definition the direct heated might gently enter the grid currents and run in A2. 6C33C in contrary is indirect heated and it even theoretically can’t operate properly with grid currents. If eve if you give to 6C33C super powerful driver than as soon swing in grid approaches the bias voltage the tube will just clip. The direct heated do not clip, the run higher distortions but the still are operational in A2. This gives to people who do not care HOW the amp running a feeling that 845 has more bass sand more dynamic.  The reality is that one need to be certain if the sensitivity of his acoustic system is enough to be able to use 6C33C in A1 , if not then all bets are off. I was laughing to see the idiots big-Willson user who claim that that bough Lamm ML3 and feel that it has more dynamic and more bass then Lamm ML2.0. I did ask them if any of them ever seen on scope what happen when 18W Lamm SET begin to drive the dead 15” Willson ported woofer. Of cause they have no idea what I even asked – they are too “big” reviewers to pay attention to such “small” things. Anyhow, if the 6C33C is not stressed to A2 then I do feel that 6C33C has better bass then any 845 I heard.
 KOTriode wrote:
One always think that you have to use directly heated triode to get the best midrange out of a tube amplifier, the 6C33C proves that it is no longer necessarily true. The 6C33C is simply so revealing and coherent on pair of stacked Quad, it just sound much better than many amp in my stable, and that's include a pair of Futterman OTL 3.

I do not necessary agree with it. The “best midrange” is a complex subject. I have absolutely no problems with 6C33C midrange but there is more to it. If you run multi-way installation then you have you own custom objective to the sound of MF channels. You change the compression driver; crossover, you play with wires and with many other aspects, I went even further and added tonal injection as I was not able to get tone I needed from one MF. The 6C33C has very nice and clean midrange but it has only one type of midrange. If one would like to add own specific twist into out of midrange MF channel then 6C33C, in my view, does not give a lot of options. You can get many different productions of 6C33C and they all will sound the same more or less. With directly heated triodes we have fallibility to find the character we want among many options. As I went for DHT I was paling with dozens of different tubes unit I found the one that doe the best in context of the rest of my efforts. If you compare the 6C33C midrange with the midrange on my current MF DHT tube (YO186) than the DHT will be laughable. I guess it produced a huge amount of distortions but you would never seen a person who walked out of my room and did not claim the it was the cleanest and the most interesting MF s/he even heard. The point that I am trying to make is that in context multi-ampling the 6C33C is not the most flexible tubes if one goes for any custom characters for given channel. The 6C33C is very clean and too straight forward for “some” applications.

The caT

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