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Old 31st August 2009, 12:41 AM   #11
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Try Zen and another one in a stereo configuration and check if you still have a good stereo image. I mean, use your ears for direct comparison.
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Old 31st August 2009, 01:03 AM   #12
Bigun is offline Bigun  Canada
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will do.

Right now I'm listening to TGM1 and TGM2 in stereo. I can tell it's not quite the same as two the same. The bass imaging seems the most affected, the rest of it is pretty good.
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Old 31st August 2009, 03:46 AM   #13
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Quote:
by jerluwoo - The same change in harmonics can be achieved by simply adding a resistor from the output to the "tail" in the ltp of a standard set up using a regular ring of two ccs.
Absolutely , just adding one resistor from my CCS to tail I can double my H2.

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By gordy - Ostripper, may I ask which amp provided that clean FFT result? Is it Diy-able or a commercial amp?
Yes you may , That FFT is just the combo of "symasym - the next generation" and "self type 3 EF (hybrid triple)". Even with a TGM type voltage stage the result is sweet.

The switching distortion (H5/7) of the double EF with suckout cap is frequency and load dependent and might negate any H2 "maniplations" .
OS
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Old 31st August 2009, 04:17 AM   #14
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by ostripper View Post
Absolutely , just adding one resistor from my CCS to tail I can double my H2.
Yep, that's what I described and used on my TGM1. But, if you believe simulations, the Aleph modulated CCS is superior in terms of less higher order harmonics.
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Old 31st August 2009, 05:02 AM   #15
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the Aleph modulated CCS is superior in terms of less higher order harmonics.
That is my point , vanishing H5/7. BUT , if your OP stage is reintroducing it , you are still at ground zero. I am "tinkering" now , to see if the aleph CCS in combo with my new "CCS powered type 3 triple" can come close to eliminating it altogether . just one more device can't hurt.

BTW , on your TGM/aleph , what are your tail currents??
OS
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Old 1st September 2009, 12:47 AM   #16
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I don't mind the Aleph's gate bootstrap cap, its like a freebie CCS...
But I don't care for the coupling cap. Though Nelson sais his 220uF
is less a problem than non-linear gate capacitance, gate worries me
too...

Anyways, here I direct couple an Aleph through the emitter.
And the split sense resistor, compared to the fixed VBE drop
of one emitter computes all the active current sink magic...

The downside to this, is now your plate is driving the gate of the
mosfet (as if the emitter wasn't there). So you want this gate to
be small and easy to drive. I find a Darlington arrangement drives
friendlier than one huge mosfet.
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Old 1st September 2009, 01:42 AM   #17
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Above post was intended for your other similarly themed thread.

SET amp using Triode-FET complementary feedback pair ?

I guess I had them both open at once, and got mixed up...
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Old 1st September 2009, 02:26 AM   #18
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by ostripper View Post
That is my point , vanishing H5/7. BUT , if your OP stage is reintroducing it , you are still at ground zero. I am "tinkering" now , to see if the aleph CCS in combo with my new "CCS powered type 3 triple" can come close to eliminating it altogether . just one more device can't hurt.

BTW , on your TGM/aleph , what are your tail currents??
OS

It would be interesting to combine it with the Triple OS. There's always the danger that my sims are not 'good' in some way I've overlooked so it will be interesting to hear what you discover.

My current thinking now is that the additional benefits of the non-switching CFP output look HUGE so I am only continuing simulations on the combination of TGM-Aleph-(non-switching)CFP.

The tail currents in the sim are running at around 2.7mA, that's means a good solid current down each leg. I haven't looked at the impact of different current levels but the Aleph CCS might not behave so advantageously at low currents.

Kenpeter - thanks for the response, I know it was aimed at my thread on a Hybrid amp in the tubes forum but I think this is the right thread to talk about the Aleph CCS - the other thread is really to focus on a Tube-MOSFET CFP hybrid and the Aleph CCS is simply a carry-over from my use of the Zen amp as a starting point. I fear I have too much going on !
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Last edited by Bigun; 1st September 2009 at 02:41 AM.
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