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Old 1st March 2006, 03:47 AM   #81
moe29 is offline moe29  United States
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Zen V9 may measure better.... but does it sound better?

Measurements vs. Sound Quality came to mind becasue i was thinking
of the Stereophile review of Yamamoto A-08 amp in this month's issue.
(It's a 2 Watt tube SET) Art Dudley gave it a good review - comparing it favorably
to his Lamm ML2.1s.

The funny thing was reading John Atkinson's measurement comments.
He said the amp was handsome and beautifully made.... LOL.

"Not much more than 300mW are available into 8 or 16 ohms at our
usual definition of clipping of 1% THD."

I'm building the Zen V8 now, and will probably build the Zen V9 too,
will be neat to listen to the differences in my system.
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Old 1st March 2006, 03:48 AM   #82
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Default Ah, but...

Apassgear, what if you make a mirror of the circuit and run it parallel in order to achieve balanced/bridge mode?

I'm so curious!

John
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Old 1st March 2006, 03:54 AM   #83
moe29 is offline moe29  United States
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Blues,

I think i remember reading that Mr. Pass said that as of right now
PassDIY wasn't going to be selling anything. I suppose it frees up
more time for Mr. Pass to crank out new Zen versions

I'm sure as long as we keep it not-for-profit, and for the members of
this Forum it wouldn't be a problem.

Of course there's nothing wrong with getting permission before proceeding.
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Old 1st March 2006, 11:54 AM   #84
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Default point to point mania

I have given it more thought and finnaly came upon the solution that will (hopefully) go into construction.
I think it offers small signal path lenghtht, em length (boy, my English is a bit blur today), actually it's designed to fit on one of them Eurocard/protoyping things.
I've checked a couple of times, but I don't guarantee that the design is free of wiring-mistakes.

The two ground-points should be connected "with a fat piece of wire" and then terminated to earth-ground via a resitor or one of them NTC things or else.
The pot will probably be a Bourns, cermet .5W.

Two remarks:

First, the power resitors should be mounted with a little distance from the PCB (maybe onto some individual stand offs where the big black dot are in the diagram) to allow some air to flow. There should also be some space to the right of the .47 3W Resistor.
The input resistor and the feedback network should be mounted at the bottom of the PCB. Else the power resistors will heat them up, which is bad if we want constant values. There will also be more space available on top of the PCB.

Second, the output-decoupling capacitors' placement is not ideal yet. As far as I know, bypass-capacitors should be placed closer to the load than the bypassed capacitor, which is true for the .47 3W resistor, but not for the 100 3W one. So there some improvement could be done. But maybe it doesn't matter dealing with such short distances. Your comment please.



Now some questions: How much power (VA) for the transformer? CLC-Filtering or will rectification and some big cans be enough? What happens if the value of the feedback-cap is increased?
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Old 1st March 2006, 11:57 AM   #85
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Here's what the whole thing might look like. On paper, of course.
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Old 1st March 2006, 12:02 PM   #86
steenoe is offline steenoe  Denmark
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Quote:
CLC-Filtering or will rectification and some big cans be enough?
You can use a simple psu for this amp. The Capacitance multiplier clean up the supply rails really well. A couple of cans, say at least 30.000uF should do the trick.
A couple of 300VA trafos should be fine.
That P2P work look great.


Steen
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Old 1st March 2006, 12:18 PM   #87
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Yeap . . . really looks great . . .
As long as it is practical, I always go with p2p.
Personality . . .
More fun . . .
Flexibility . . .
Easier variation . . . (for this reason, I use a bit maginal lengths of wires . . . Noise pick up . . .? Errrrr . . . . . .)

But, do not do like the tooboo man, Choky, doing . . . teravle . . .

Regards
jh
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Old 1st March 2006, 12:45 PM   #88
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Quote:
Originally posted by moe29
I'm sure as long as we keep it not-for-profit, and for the members of
this Forum it wouldn't be a problem.

Of course there's nothing wrong with getting permission before proceeding.
Hi Moe,

I very much share your sentiment. The PCBs I am working on right now are really just because I wanted a few for myself, and for my buddy Steen as well as a few others. If I get a few made it will only be with Mr. Pass' permission and strictly NFP.

Cheers!
Russ
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Old 1st March 2006, 01:08 PM   #89
Blues is offline Blues  United States
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Quote:
Originally posted by Russ White


Hi Moe,

I very much share your sentiment. The PCBs I am working on right now are really just because I wanted a few for myself, and for my buddy Steen as well as a few others. If I get a few made it will only be with Mr. Pass' permission and strictly NFP.

Cheers!
Russ

Russ,

I'm with your idea. Maybe I'd just want something from Mr. himself that I can afford (brand new) and as long as it's also with Mr. for you to proceed.

Thanks for your efforts.

Allan
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Old 1st March 2006, 01:10 PM   #90
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I have a question, and, possibly, based on the answer a suggestion for Russ.

Would it work to implement ZV9 without the negative feedback (installment 3), but with the Aleph current source? Or does the Aleph current source require the feedback?

I do not know, at this point, whether I want a power transconductance amp or not and I would like to have the advantage of the Aleph current source regardless, if that's possible.

Assuming one can add the Aleph current source without the negative feedback, it might be nice if the PCB offered the ability to add it in or not.

Regardless, I would be interested in purchasing PCBs if and when they become available.

Thanks.

Paul Ebert

P.S. Russ, some time down the road, it would also be nice to have a balanced version to match the X-BOSOZ.
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