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Old 20th March 2004, 09:26 PM   #21
argo is offline argo  Estonia
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Onother 6C33C SET

http://www.borbelyaudio.com/15wse.pdf
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Old 21st March 2004, 02:33 AM   #22
AKSA is offline AKSA  Australia
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Thanks Guys,

Very useful information, particularly Borberly's design, which is up to his usual very thorough standards!

Thanks again,

Hugh
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Old 21st March 2004, 03:49 AM   #23
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Hi,

Attached one more schematic for your choice, I have prepared all components and need time to complete this project.

Rgds,
Red
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File Type: gif 6c33c_6.gif (16.6 KB, 1146 views)
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Old 21st March 2004, 09:15 AM   #24
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This is one more link in German.

http://www.jogis-roehrenbude.de/Verstaerker/6C33C-N.htm
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Old 21st March 2004, 09:19 AM   #25
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This commercial design is under Bilder (images)

http://de.msnusers.com/6C33C-B
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Old 21st March 2004, 11:25 AM   #26
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Hi,

One of the first who deisgned a SE amp with 6C33C was Mr Dakesue in Japan. I built a kit designed by him using the 6C33C. According to Mr Dakesue the 6C33C sounds best at relatively low anode voltage ~200V and 200mA current with 600 ohm load.

http://www2.gol.com/users/tube/se.html

If the dissipation in a 6C33C is kept below 40W or 2/3 of max the life time is very long.

I have had no problems with valve sockets in my SE amp, (>6 years) or my OTL, (> 4years).

BTW, Miller capacitance is not so high in these tubes as u is very low.

Regards Hans
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Old 22nd March 2004, 07:33 AM   #27
AKSA is offline AKSA  Australia
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Hi Hans,

Thanks for your response; very interesting information.

I intend to run the tube at 220V, 200mA, using 6SN7 followed by 6BX7 as driver.

BTW, what do you think of the sound of your circuit?

Cheers,

Hugh
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Old 22nd March 2004, 11:27 AM   #28
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Quote:
BTW, what do you think of the sound of your circuit?
I thought is was very good even compared to other SE amps using 300B and 2A3, also when comparing to quite high end solid state amps, (Electrocompaniet, Luxman, Sunfire and others) most people listening noticed that the sound was smoother and the SE amp didn't add any thing bad sounding to the music, especially compared to a high spec Luxman the sound was very smooth and nice and the problems with the Luxman especially really showed themselves, (the person owning the Luxman sold it shortly afterwards as he was so disappointed)

However, as all SE amps I have heard this amplifier also mask some details in the music, I believe this is due to high 2nd order distorsion and IM that is also quite high, at least much higher then in many other non SE amps...

After building my OTL amp I really heard what was missing with the SE amp and for me SE amps is a dead end, I have also compared my OTL with other SE amps of good reputation but the result is the same.

Maybe what I described above will invite a lot of bashing but I stand firm in my belief of OTL amp superiority over SE amps until someone convince me of the opposite.

Regards Hans
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Old 22nd March 2004, 01:49 PM   #29
Previously: Kuei Yang Wang
 
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Konnichiwa,

Quote:
Originally posted by tubetvr
After building my OTL amp I really heard what was missing with the SE amp and for me SE amps is a dead end, I have also compared my OTL with other SE amps of good reputation but the result is the same.

Maybe what I described above will invite a lot of bashing but I stand firm in my belief of OTL amp superiority over SE amps until someone convince me of the opposite.
No bashing or the like intended, but I would like to know a little more about the system context (especially speakers) and your seating preferences in the concert hall (I like "Mid-Hall" Center best), assuming you include classical music (fresh and converve) in you musical diet.

Would you mind telling? It might give a better context to place your comments in.

My experience with OTL's was not as favuorable as yours. The OTL's where Croft Monoblocks, 4 X EL509/519 Output Valves per channel. I have also had a chance to hear later Croft OTL's based on the 6AS7 and in both cases I noted a number of performance areas where the Transformer coupled SE and PP DHT Amplifiers at had where by far superior (especially low level detail retrieval).

Of course, it may very well be that Crofts are simply bad OTL's or simply that I enjoy a little 2nd Harmonics from an SE Amp (but why then do I like all transformer coupled PP DHT Amp's equally well?) or I just like having transformers in the signal path.

Sayonara
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Old 22nd March 2004, 03:13 PM   #30
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Hi,

Quote:
The OTL's where Croft Monoblocks, 4 X EL509/519 Output Valves per channel.
About the worst OTL Glenn ever did IMO but with some modification you could make it into a great little OTL.

Mine is the Series II which uses 10 //ed 6080s but I had trouble with the main PS for the tubes as he had put 100Vers in series to create 200V caps.
I had them replaced with 250 V Mallorys of similar total value and haven't had problems since.

He also derives the bias for the output stage from the negative rails which is IMO cutting a corner whith a highish risk factor.

Sonically the Series II is very hard to beat but from reading you it may well be not your cupper.

Cheers,
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