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6C4C E80CC PP IT coupled
6C4C E80CC PP IT coupled
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Old 3rd December 2017, 02:50 PM   #1
claudiomas is offline claudiomas  France
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Default 6C4C E80CC PP IT coupled

hello everybody
few weeks ago i made this lovely small DHT PP with URSS 6B4G Svetlana LogoC
6C4C, interstage LL1660 driven by E80CC , LL1540 splitter driven by E80CC SRPP
sound very nice THD all harmonics 0,1% for 8Watt
THD 1% for 10W so no bad for tube amplifier
E80CC its long life gold pins Philips special Quality very low distorsion medium mu twin triode, here Dario and Haltron made by Philips Hollande Netherland.
also 6C4C are beautyfull and very well built DHT triodes from URSS Svetlana logo C.
5C3S logoC rectyfier, oil caps and electrolithics and choke for HT power supply.
the negative bias on parallel choke 600H 10mA
NP cathode caps, transformer splitter, i now should write down schematics
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Old 3rd December 2017, 03:29 PM   #2
claudiomas is offline claudiomas  France
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preliminary schematics
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Old 3rd December 2017, 04:01 PM   #3
claudiomas is offline claudiomas  France
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i should write inspiration for this amp come from Jefferson 2A3PP 1933
thanks Mr Jefferson and Mr Lilienthal
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Old 3rd December 2017, 05:08 PM   #4
audiowize is offline audiowize  United States
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Those are some nice numbers. What impedance is your output transformer?

A customer of mine dropped off 3 large Gulbransen 6V6 push-pull amps, and I've convinced him that they should become a single pair of push-pull 6B4G monoblocks. I even got a nice pair of 4K push-pull output transformers.
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Old 3rd December 2017, 05:32 PM   #5
claudiomas is offline claudiomas  France
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OPT are 1615 hammond 5K/15W
brass screw and nuts and sound very nice
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Old 3rd December 2017, 11:34 PM   #6
6A3sUMMER is offline 6A3sUMMER  United States
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The schematic in post #2 has the -57V bias shorted through the choke to ground.
Just a simple drawing error?
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Old 4th December 2017, 12:16 AM   #7
claudiomas is offline claudiomas  France
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Quote:
Originally Posted by 6A3sUMMER View Post
The schematic in post #2 has the -57V bias shorted through the choke to ground.
Just a simple drawing error?
its just like my granfather make amplifiers,its not "short" but act like grid choke , its 600H 5Kohm 10mA choke, soud its better, lower thd and noise great stability
just like:
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Last edited by claudiomas; 4th December 2017 at 12:32 AM.
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Old 4th December 2017, 03:01 AM   #8
Shef is offline Shef  Canada
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While I admit this way has its right to existence. .. how about the opposite way? Balanced Input + PP IT to parallel SE Output stage, I'm more and more thinking of this way.
Just recently I repaired some custom-made Japanese amp, implemented this way, very liked its sound.
Interesting detail discovered: each of two output tubes had its separate OPT's primary winding, h-m. ..
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Old 4th December 2017, 08:00 AM   #9
jazbo8 is offline jazbo8
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6C4C E80CC PP IT coupled
Schematic, PSU Not Shown:

Screenshot - 12_4_2017 , 8_59_11 AM.png
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Old 4th December 2017, 09:23 AM   #10
matejsirk is offline matejsirk  Slovenia
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6C4C E80CC PP IT coupled
C3=10uF (R1=330 Ohm)? It is enough?
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