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Where are the ZV9 builders???
Where are the ZV9 builders???
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Old 27th March 2008, 09:46 PM   #191
Fuling is offline Fuling  Sweden
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Tyimo: I have similar stuff in my junkbox(es), except that my biggest cores are 420VA EI-types and my biggest toroid transformer is "only" 750VA.

I think there are a few threads about L-loaded SS amps already, we could bring one of them back to life instead of starting a new one.
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Old 27th March 2008, 11:01 PM   #192
flg is offline flg  United States
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Quote:
Originally posted by Fuling
...
I think there are a few threads about L-loaded SS amps already, we could bring one of them back to life instead of starting a new one.


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Old 27th March 2008, 11:27 PM   #193
Fuling is offline Fuling  Sweden
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Old 28th March 2008, 12:44 PM   #194
flg is offline flg  United States
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Old 25th April 2008, 08:14 AM   #195
Vix is offline Vix  Yugoslavia
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Hi,

I have a question for Steen:

Are you using your Zv9 with feedback (as in the original schematics), or without one? (with Aleph CS disconnected)

Lately I've been playing with my Zv9, and tried diferent value of feedback resistors...

At the moment, I got pleasing sound with those values:

R17: 31.7 K (27K +4.7 K)
R16: 2.7 K

Plus I connected 15 ohm resistor across the speaker terminals...

So I guess that I got something between a voltage and current amp, with miniscule amount of feedback...
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Old 25th April 2008, 08:32 PM   #196
steenoe is offline steenoe  Denmark
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Hi Vix. I think you are on the right track. I am using mine without the Aleph CCS and with no feedback at all. I think this results in too much "Discobass" as we used to call it. Discobass is above 100hz! I cant blame NP for wanting to stuff the Abby's mouth with a half pound of dacron. I have also installed the recommended // filter. (10r/10uF/10r as far as I recall) I think the amp needs a little feedback, to tame the upper bass output. I could use a little more deep bass, but thats not possible from a 6" driver, so its all about smoothing the excisting soundstage.

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Old 28th April 2008, 11:11 PM   #197
Vix is offline Vix  Yugoslavia
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Thanks a lot.

If you keep the original R17 at 47K, you can try 3.9 or 4.7 K for R16. Or, even better, place 2.2 K reistor + 4.7 Kohm trimpot in series for input R (R16. As you change it, the amount of feedback will change, thus affecting the gain, and , more important, tonal balance. Boiled water, I know, but the effect is interesting.
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Old 1st February 2010, 06:07 AM   #198
Uselink is offline Uselink  Russian Federation
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Hi everybody!

I am not a professional in building such things. More amateur.
I try to build Zen 9 . This week i will make the PCB for the amp part. This is Peter Daniel type PCBs. But i have no any thoughts about good power supply for the Zen 9.
I saw many circuits of power supply but can not choose right.
Please give me advice what circuit i can use for it.

With the best wishes,
Aleksey.
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Old 27th June 2010, 05:07 PM   #199
yggdrasil is offline yggdrasil  Norway
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Finally finished my Zen 9. Have had it lying in the workshop almost finished for a couple of years.

Anyway I got the transformer and heat sinks a few weeks back, and here it is.
Attached Images
File Type: jpg 152_5207.jpg (457.3 KB, 248 views)
File Type: jpg 152_5210.jpg (392.8 KB, 218 views)
File Type: jpg 152_5214.jpg (447.0 KB, 215 views)
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Old 28th June 2010, 06:02 AM   #200
VladimirK is offline VladimirK  Uzbekistan
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Here is my current version of upgraded Zen9. My new PMC EB1i power demanding loudspeakers are very happy with these monoblocks, excellent sound without any reservations even at the low end. Classic music, metal, jazz, organ, everything is amazing. The square wave picture is for 3,2Ohms resistive load, 15V peak-to-peak, 10kHz, C8=15pF. With C8=5pF the picture is still OK.
Attached Images
File Type: jpg Zen9 4,8А schem monobl.JPG (178.3 KB, 191 views)
File Type: jpg Foto Monoblocks 4,8А res.jpg (77.2 KB, 197 views)
File Type: jpg SquareWave 10kHz 3,2Ohms 15pF resize.jpg (79.0 KB, 114 views)

Last edited by VladimirK; 28th June 2010 at 06:09 AM.
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