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Old 9th November 2009, 03:03 PM   #41
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Default Aaaaaaaaand

Again the principle is to lower primary impedance and to drive output tubes in counter-phase independent grid-cathode drive.
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Old 9th November 2009, 03:29 PM   #42
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Good thinking.
Many of Sinclair-Peterson ideas are published in their (accessable) pat. 2802907.
And Yamaha also considered diff. SRPP stage (in their pat. 4241313 with a bunch of SIT amps circuits), although not with the same degree of sofistication.
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Old 9th November 2009, 05:38 PM   #43
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Dagnabit.... Now I gotta go add a toroid to my GR collection... See what you did!
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Old 9th November 2009, 06:47 PM   #44
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Default best method?

Quote:
Originally Posted by StevenOH View Post
And Yamaha also considered diff. SRPP stage (in their pat. 4241313 with a bunch of SIT amps circuits)
The Yamaha B1 amplifier was an output structure not too dissimilar to the WSF-4. The WSF-4 style of design was derived from the Sinclair-Peterson concept long before I ever serviced a Yamaha. The B1 uses a differential current source from a far away minus rail called "C" as well, however Yamaha uses another pair of "SITs" to drive the output pair. This was due to a need to reduce the gate drive Z because of a fundamental flaw in the device geometry that could not be economically solved at that time. That flaw eventually caused the cessation of production as well as the damning advent of vertical MOS in the late 70's. The B2 version was an entirely different animal using N and P channel "SITs" in a complimentary output stage but not as elegant in design and not as clean in my estimation.
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Old 9th November 2009, 07:28 PM   #45
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Default PS

This illustrates the fundamental concept as originally promoted and as I prefer to configure it. It should be noted that the filament winding capacitance for the upper tube should be in a guard shield coupled to the output. You can just imagine where the displacement currents at high frequency would go otherwise.
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Old 9th November 2009, 08:21 PM   #46
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Oh, you like differential SRPP, do you?
But try to make a power stage of this!
Differential White Cathode Follower...

If the pic is a little confusing, cause of
5VPP CM @ 400Hz + 5VPP PSR @120Hz
just showing how it rejects all that...

I got a bunch of General Radio stuff,
masterpiece of my collection one of
their slotted lines. Never figured why
GR874 connectors didn't catch on...
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Last edited by kenpeter; 9th November 2009 at 08:30 PM.
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Old 9th November 2009, 08:39 PM   #47
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[QUOTE=kenpeter;1975128]Oh, you like differential SRPP, do you?
But try to make a power stage of this!
Differential White Cathode Follower...

..................do it all the time, but not as follower.............. ! !

Nice follower though................
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Old 9th November 2009, 08:44 PM   #48
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[QUOTE=kenpeter;1975128]Oh, you like differential SRPP, do you?
But try to make a power stage of this!
Differential White Cathode Follower...

Which model do you use for the 6DJ8? if I may ask
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Old 10th November 2009, 02:54 AM   #49
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Quote:
Originally Posted by kenpeter View Post
I got a bunch of General Radio stuff,
masterpiece of my collection one of
their slotted lines. Never figured why
GR874 connectors didn't catch on...
They were 14 mm and 7mm was the next venue represented by Hewlett Packard APC-7 the ones used in microwave after that were 3.5mm but I agree with Tektronix that the GR-874 was hands down the most versitile connector overall through 8 GHz. Even the 900 was not as generally useful though more precise for what I use them for. All my lab setups are dominated by 874 interconnects from audio to RF.
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Old 10th November 2009, 06:35 PM   #50
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6DJ8 model? Probably Duncan Amps' if I recall...
Or you asking which brand real 6DJ8 do I use???

Amperex mostly, from my dad's collection of HP
and Tektronix pulls. I prolly got 50 of those...
Sylvania and Telefunken too, but not so many.

"NH" No Heater... Yeah, definitely Duncan..

But back to the point. You are about the only
other person I've ever seen abusing a split tail
CCS with cap bridged across. And doesn't look
like the first time you have played with that
particular configuration?

Last edited by kenpeter; 10th November 2009 at 06:47 PM.
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