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Old 7th September 2006, 06:08 PM   #11
steenoe is offline steenoe  Denmark
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Quote:
Zen V9 . . . ? No, I am unsure that I could handle that small Jfets.
I am sure you can deal with them! Having seen your previous work, I wont hesitate to recommend the ZenV9 It just sounds so sweet The ZenV5 is all about HUMMMM, as far as I know You really will need a perfect PSU(read: not cheap at all) No way around the big inductors in the PSU So you better get going on that ZenV9 Havent heard a sweeter topend before! Following Mr. Pass's instructions, its dead silent without signal's

Steen
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Old 8th September 2006, 02:39 AM   #12
Formerly "jh6you". R.I.P.
 
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Quote:
Originally posted by Zen Mod


ya wanna pair of Babelfish PCBs?

YES.
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Old 8th September 2006, 03:43 PM   #13
Formerly "jh6you". R.I.P.
 
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Choky,

I wonder why I can't go through your mail.

Always get this message:

"80.74.160.XXX does not like recipient.
Remote host said: 550 Denied by RBL
Giving up on 80.74.160.XXX."

Hmm . . .
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Old 8th September 2006, 06:11 PM   #14
moe29 is offline moe29  United States
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my scary Zen 5 on the bench. I still have not finished this project...
maybe this winter!

thread
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Old 8th September 2006, 06:52 PM   #15
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Babowana
Choky,

I wonder why I can't go through your mail.

Always get this message:

"80.74.160.XXX does not like recipient.
Remote host said: 550 Denied by RBL
Giving up on 80.74.160.XXX."

Hmm . . .

you can always mail me via board "email" button;
besides-I can add your mail addy to white list of my ISP
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Old 10th September 2006, 06:55 AM   #16
Formerly "jh6you". R.I.P.
 
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Quote:
Originally posted by steenoe


I am sure you can deal with them! Having seen your previous work, I wont hesitate to recommend the ZenV9 It just sounds so sweet The ZenV5 is all about HUMMMM, as far as I know You really will need a perfect PSU(read: not cheap at all) No way around the big inductors in the PSU So you better get going on that ZenV9 Havent heard a sweeter topend before! Following Mr. Pass's instructions, its dead silent without signal's

No doubt about your recommendation with ZV9.
No doubt about the potential hummm from ZV5.
And, no doubt that Papa dislikes the hum.
The hum is everywhere.
Diyers have hums even with Aleph, Aleph-X, P1.7, X-CCS-BOSOZ . . .

I'm very intersted in the original dumb PSU of ZV5 with the gentle wakeup calling C10 and C11. And, also interested in the large C8 and C9, which are informed as effectively helping the regulator to be an ideal ac short. I want to experiment these things . . .
Ahhhh . . . one thing . . . I still wonder with L1 and L2 . . . whether they are must or just a dumb trial . . . whether replacing them with ripple-filtering Rs would be also acceptable . . .

I'm hungry in learning things . . .
Of cource, I would like build ZV9 and Babelfish, too . . .
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Old 12th September 2006, 03:14 AM   #17
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Quote:
Originally posted by Babowana


Ahhhh . . . one thing . . . I still wonder with L1 and L2 . . . whether they are must or just a dumb trial . . . whether replacing them with ripple-filtering Rs would be also acceptable . . .

mmm . . . nobody responds . . . I feel lonely . . .

By the way, I am thinking to replace IRF240 and its P-ch partner with IRFP250N and its P-ch partner. I have two reasons: (1) I hardly get IRF240 in this market place and (2) according to datasheets, IRFP250N has a transconductance about double-higher than IRF240 so that it could provide me about double-damping factor.

Hehe . . . I ignore the different input capacitances between them . . .
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Old 12th September 2006, 08:53 AM   #18
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Originally posted by Babowana


(2) according to datasheets, IRFP250N has a transconductance about double-higher than IRF240 so that it could provide me with about double-damping factor.

But, the higher damping factor (DF) is not my real target. I would be happy with the original DF. I am actually thinking to return the increased DF back to the original level, by lessening the bias near to 1A (target) if I do not loose much of the 2A-bias sound quality.
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Old 13th September 2006, 02:02 AM   #19
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I follow Papa’s rule of thumb for the transformers.
I consider max 2A bias (actual 1 to 2A).
I consider 20V rails.
2.5 x 2 x (20+8) x2 = 280VA
Hmm . . . two 300VA for two mono blocks.
(20+8+3)/1.4 = 22Vac

Okay, I am going to order two of (110-0, 110-0 / 22-0, 22-0 / 300VA / 50Hz).
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Old 16th September 2006, 01:12 AM   #20
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Quote:
Originally posted by Babowana



Ahhhh . . . one thing . . . I still wonder with L1 and L2 . . . whether they are must or just a dumb trial . . . whether replacing them with ripple-filtering Rs would be also acceptable . . .

I'm hungry in learning things . . .
Of cource, I would like build ZV9 and Babelfish, too . . .
Hi Babowana,

First, I do not _know_, but I think the inductor was chosen
over a resistor for power efficiency reasons. In other words,
you could use a resistor, but you will convert more energy into
heat.

Robert
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