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Old 7th July 2005, 04:43 PM   #1
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Exclamation 833a Amp 75W SE

I would design gladly a 833a amp. Perhaps does someone have thereby experience or even a good connection diagram? I would use 845 a triode gladly as driver
( however I would do gladly
without the two transducers in the preliminary stage).
The whole is to become SE amp.
The 833 anode voltage is to be operated and with -60V bias with a Raa of ~20k. it is around the 75 -100W to carry out in such a way with 3000V.

MfG Dominic from Germany
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Old 7th July 2005, 05:36 PM   #2
Giaime is offline Giaime  Italy
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Default Re: 833a Amp 75W SE

Originally posted by dominic_tollens
I would use 845 a triode gladly as driver

Originally posted by dominic_tollens
it is around the 75 -100W to carry out in such a way with 3000V.

However those crazy things turn out to be great most of the times! (I wonder about the power consumption of that amp)
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Old 7th July 2005, 06:17 PM   #3
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Why use something as whimpy as a 833A when you could build One of These
There are no foxes in atheistholes
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Old 8th July 2005, 11:37 AM   #4
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Check out this tread with Reinout's stunning 833 amp!

Where are the 833 amps?
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Old 8th July 2005, 07:38 PM   #5
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I will probably build this Amp. However with another driver, I think however I the Amp also times in the orginale will try out. Later then 845 drivers after Unison a S8, thus I have good experiences of sounded made ago.
It carries for instance 13W out (With small change which that heat the ECC concerns. )

Unison S8 "Driver"

833a 75W Schematic

Which hold you from orginal the circuit and/or from the idea the S8 as drivers to use in such a way.

Gladly I would try also times the Wavac out 833 circuit. There does someone know which more drueber?

MfG Dominic
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Old 14th December 2006, 02:12 AM   #6
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I have some schematic's from Lancroft Audio, but they are not so perfect like i would want. I was thinking, building a very good set amp with a 300B and in place of a OPT, using an interstage trafo to drive the 833A, I was thinking of using the 300BXLS (powered at 472V and 120mA), drived by a -stage of D3A penthode and 27 triode (Attilla from Triode Dick) and in place of a beefy OPT, using of an interstage transformer. And i have an electron tubes book T1 from Philips, 1985 and would the TB4/1250 not been better than the 833A? The TB4/1250 looks better than the 833A, maybe little more stable?
I think that if you think, an 833A from Wavac, rated at 150w classA i think that it is most A2 driven, so sounds not so good.
I have a schematic of the HE805 from Wavac, and the schematic diagram don't look spectacular high-end, more like an overkilled dissapointment (in technical therms if you study the schematic diagram)...
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