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Old 20th November 2012, 04:02 PM   #61
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I am encouraged to read the reviews. I am very glad to see that you are all enjoying it so far.

Thanks!

Cheers!
Russ
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Old 20th November 2012, 04:35 PM   #62
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Originally Posted by shoom View Post
The lift in clarity and detail retrieval is far from subtle and the overall improvement it made to the sound was obvious.
I was skeptical when I dropped a pair into my dual mono build but do agree. I'll gladly take better.
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Old 22nd November 2012, 07:36 AM   #63
Goto is offline Goto  United Kingdom
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Hi Russ

Dropped the new AVCC module into my Buffalo, let it run for a few hours (mainly because I was busy elsewhere) and had a good listen last night.

As with applying the CCS mod on the old B24 this is a very handsome upgrade. Really lifts the music. Great effort.

Thanks for keeping at it.

Mark
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Old 22nd November 2012, 02:15 PM   #64
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Put a couple in my BII dual mono with Feastrex traffos & tube I/V...
WOW!! Deeper blacks, more realistic transients, especially on piano key attacks, better imageing around the instruments and vocals. Best $80 upgrade in ANY of my systems going back to the 70's

IMPRESSIVE.

JD
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Old 29th November 2012, 04:14 PM   #65
glt is offline glt  United States
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Default Received the AVCC2.1

Superb finish and workmanship. I can see the improved use of top and bottom layers in the layout. Looks very nice too.

Compared with my original AVCC that came with BII. It is a v1 version. Didn't realize that there has been a v2 and now the v2.1

Also notice that the n-channel transistors in the v1 are gone in the V2 design. Just out of curiosity, what improved from v1 to v2?
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Old 29th November 2012, 08:45 PM   #66
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Which parameter(s) are you referring to?

Thanks...

2.4v/uS per example. I have built quite a few shunt regs with a similar topology and they have all been very sensitive to the AC performance of the opamp.
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Old 29th November 2012, 09:22 PM   #67
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Quote:
Originally Posted by glt View Post
Just out of curiosity, what improved from v1 to v2?
Everything. I won't give away all of the secret sauce, but I agree though our current choice for the opamp is much better than the previous one - live and learn.
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Old 29th November 2012, 11:51 PM   #68
glt is offline glt  United States
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Everything. I won't give away all of the secret sauce, but I agree though our current choice for the opamp is much better than the previous one - live and learn.
Hi Russ,

I guess I am in for a big surprise :-). The 2.1 looks so simple: an Opamp and two p-channels: one got to be the pass transistor and the other I would guess the ccs for the LED reference. I guess simplicity is its best friend...
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Old 3rd December 2012, 09:33 PM   #69
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Hi Russ!

May I assume you considered beneficial improvments in resolution and hf supression by adding filter cap on shunt outputs described in your support forum (Max Cap value on output of Trident Reg) and somewhere else?
Is there a way of upgrading old version of avcc?

Thanks and Regards.
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Old 3rd December 2012, 09:41 PM   #70
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Quote:
Originally Posted by AndriyOL View Post
Hi Russ!

1) May I assume you considered beneficial improvments in resolution and hf surpression by adding filter cap on shunt outputs described in your support forum (Max Cap value on output of Trident Reg) and somewhere else?

2) Is there a way of upgrading old version of avcc?

Thanks and Regards.
1) Yes - I considered that - but it actually did more harm than help once the whole circuit was tuned. Too much capacitance and the output impedance starts to rise too much - I would not add any to either the new Trident or AVCC 2.1 modules when used with the BII/BIII/BIISE.

2) No - not really. You can change the opamp and also add a 100pf or so from -IN to OUT on both halves of the opamp. That will get you somewhat close. Still there is more to it than that.
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