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Old 10th February 2010, 11:39 AM   #131
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Originally Posted by regal View Post
Seems that the low primary impedance of the OPT sort of negates the low output impedance "potential" of the 633C-B, what is the max primary impedance recommended?
Hi regal,
sorry, can't say what is max. primary impedance. Until now none my own experience above that.
As you probably know, the optimal prim. impedance is 600 ohm (even upon the majority opinion).
Good luck & Cheers,
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Old 10th February 2010, 11:52 AM   #132
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Default 6c33

in a certain way u are right: enthusiasm drives the world and the tubes design. unfortunately, for tubes, there is nothing new under this sun. as long people stay happy with their own hom brew design, the world is peaceful. this seems the better way to go, we finally can agree to something as a compromise and we need not to fight with guns for other ideas. lets keep us this way!
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Old 10th February 2010, 12:11 PM   #133
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Hi
I just finished my amp with 6C33C; I must say is the best amp I ever had. I use the Borbely diagram with 6H8C and 6C2C. The sound is linear, very dynamic and detailed. The bass is impressive.
I listen a lot of tubes amplifiers but for my taste The 6C33C is far better... I was afraid at the beginning because a lot of people say that this tube don’t sound so good, maybe if look at the specification but in practice is other thing. Now I will made him a proper case ant it will be may main Amp.
My next project is Malquida amplifier with 6E5P and 6C33C. I want to see the differences between Malquida and Borbely
Regards
Gabriel.
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Old 10th February 2010, 12:25 PM   #134
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Originally Posted by tubesteve View Post
...the world is peaceful. this seems the better way to go, we finally can agree to something as a compromise and we need not to fight with guns for other ideas. lets keep us this way!
Hi tubesteve,
you have my signature under that your nice thought!
OK, I'm not joking, I really like to know your triode suggestions (without Kalashnikov in my hands ).
Cheers,

Last edited by ma_coule; 10th February 2010 at 12:29 PM.
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Old 10th February 2010, 12:29 PM   #135
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Originally Posted by gabrielbecheanu View Post
Hi
I just finished my amp with 6C33C; I must say is the best amp I ever had. I use the Borbely diagram with 6H8C and 6C2C. The sound is linear, very dynamic and detailed. The bass is impressive.
I listen a lot of tubes amplifiers but for my taste The 6C33C is far better... I was afraid at the beginning because a lot of people say that this tube donít sound so good, maybe if look at the specification but in practice is other thing. Now I will made him a proper case ant it will be may main Amp.
My next project is Malquida amplifier with 6E5P and 6C33C. I want to see the differences between Malquida and Borbely
Regards
Gabriel.
Hi Gabriel,
Congrats, nice work!
Please, can you say us some details about OT, Va, .... ?
Cheers,
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Old 10th February 2010, 01:42 PM   #136
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Hi
This is the schematic for the OT. I use iron E20 20cm Fe Si. Primari section 550 ohm
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Old 10th February 2010, 05:34 PM   #137
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Originally Posted by gabrielbecheanu View Post
Hi
This is the schematic for the OT. I use iron E20 20cm Fe Si. Primari section 550 ohm
Hi Gabriel,
thank you very much for your OT info!
But... do you mean EI 20x20cm (f.E. EI192 or EI216)?
Cheers,
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Old 10th February 2010, 06:13 PM   #138
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Hi
I found the specification is EI 120
Yog Systems India Ltd.

Last edited by gabrielbecheanu; 10th February 2010 at 06:40 PM.
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Old 10th February 2010, 06:59 PM   #139
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Hi
I found the specification is EI 120
Yog Systems India Ltd.
Thanx Gabriel,
which one EI120 is yours: a (14,8 cm2), b (19,3 cm2) or c (26,7 cm2)?
Hope not to ply you with questions to much...
Cheers,
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Old 10th February 2010, 07:52 PM   #140
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I use for the OT 19.3cm2
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