My Zen V4 Dual Mono - Page 4

UrSv · 31st October 2002, 02:04 PM

Recommendation according to the article on ZenV4 which gives you the information in writing from Mr Pass himself:

2*18 VAC giving 36 VAC at 300 VA per channel.

If running one transformer for both channels 500 VA would be suitable.

/UrSv

wchick · 31st October 2002, 03:11 PM

herm,
I'm glad to hear that your heatsink work out so good. Seem quite likely that my coming A5 should be cool enough. By the way, did you buy your heatsink directly from Aavid? If so, did you buy a big piece and cut by yourself or buy them pre-cut? Also, I'm very interested to know how much they cost you.

UrSv,
I noticed that you diy yourself a pair of ProAc 2.5 clone. I wonder what amp you feed them. I plan to build a pair too and feed with pass amp (most likely Aleph 5). I know ProAc sound great with tube. Could you give some comment about this? Thanks.

Wallace

UrSv · 31st October 2002, 03:14 PM

The ProAcs are currently driven by a DENON AVR-2800 but that will be replaced by an Aleph 30 as soon as possible.

BTW. The ProAcs do not sound bad at all with the Denon...

/UrSv

herm · 31st October 2002, 03:43 PM

Wchick;

I paid $50 for (2) 18" sections.

I got them surplus from a local motor control manufacturer
through an inside source. Too bad I can't get more - I
would buy every one they had!

I had a buddy cut them with a band saw into 9" lengths.
Not too hard, but use lots of lubricant.

-herm

Zapped · 5th November 2002, 11:13 PM

Question re: transformers. wchick, you have located your toroids side by side. Is there any bad effect from locating them stacked on top of one another. Like, some kind of saturation effect or magnetic interaction between the two?? If not, sure would save horizontal real estate to do so.

{P.S. - That is a very clean looking amp you have there, wchick. Heat sinking looks more than adequate. Hope my intended ZenV4 sinks will work --couple of 23 year old Heathkit sinks that would have been on the side of their 250 wpc kit super amp (I bought them as parts).-- but they have no where near the surface area that yours do. Have used Elliot's calculator to est. thermal resist. but not sure}

Larry Wright
Seattle area

wchick · 6th November 2002, 04:31 AM

Larry,

I can't comment the issue about stacking transformer. I myself tried to avoid this, that's why I placed them side by side. However, I do see quite a number of fellow diyers stack their transformer. Maybe other experts may comment this.

Heatsink in my amp maybe sufficient but not efficient because they are in 3 separate pieces. One of them is significantly hotter than the others. I hope you have single big heatsink in your case.

Wallace

herm · 11th November 2002, 03:36 PM

wchick;

As I stated before, I am running the Zen4 in low
power mode ( no R1 ). I am dissipating approximately
66 watts in to each 9 inch sink.

Using a kitchen thermometer, I measure a temp
of 112 degrees over a 62 ambient (fahrenheit).

Looks like you will be in good shape with your
aleph 5 monos.

-herm

wchick · 11th November 2002, 09:54 PM

Thanks for your info, Herm. Really appreciate.

Wallace

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31st October 2002, 02:04 PM	#31
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	Recommendation according to the article on ZenV4 which gives you the information in writing from Mr Pass himself: 2*18 VAC giving 36 VAC at 300 VA per channel. If running one transformer for both channels 500 VA would be suitable. /UrSv

31st October 2002, 03:11 PM	#32
wchick diyAudio Member Join Date: Jul 2002 Location: Colorado	herm, I'm glad to hear that your heatsink work out so good. Seem quite likely that my coming A5 should be cool enough. By the way, did you buy your heatsink directly from Aavid? If so, did you buy a big piece and cut by yourself or buy them pre-cut? Also, I'm very interested to know how much they cost you. UrSv, I noticed that you diy yourself a pair of ProAc 2.5 clone. I wonder what amp you feed them. I plan to build a pair too and feed with pass amp (most likely Aleph 5). I know ProAc sound great with tube. Could you give some comment about this? Thanks. Wallace

31st October 2002, 03:14 PM	#33
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	The ProAcs are currently driven by a DENON AVR-2800 but that will be replaced by an Aleph 30 as soon as possible. BTW. The ProAcs do not sound bad at all with the Denon... /UrSv

31st October 2002, 03:43 PM	#34
herm diyAudio Member Join Date: Mar 2002 Location: Seville, Ohio USA	Wchick; I paid $50 for (2) 18" sections. I got them surplus from a local motor control manufacturer through an inside source. Too bad I can't get more - I would buy every one they had! I had a buddy cut them with a band saw into 9" lengths. Not too hard, but use lots of lubricant. -herm

5th November 2002, 11:13 PM	#35
Zapped diyAudio Member Join Date: Jul 2002 Location: Seattle	Question re: transformers. wchick, you have located your toroids side by side. Is there any bad effect from locating them stacked on top of one another. Like, some kind of saturation effect or magnetic interaction between the two?? If not, sure would save horizontal real estate to do so. {P.S. - That is a very clean looking amp you have there, wchick. Heat sinking looks more than adequate. Hope my intended ZenV4 sinks will work --couple of 23 year old Heathkit sinks that would have been on the side of their 250 wpc kit super amp (I bought them as parts).-- but they have no where near the surface area that yours do. Have used Elliot's calculator to est. thermal resist. but not sure} Larry Wright Seattle area

6th November 2002, 04:31 AM	#36
wchick diyAudio Member Join Date: Jul 2002 Location: Colorado	Larry, I can't comment the issue about stacking transformer. I myself tried to avoid this, that's why I placed them side by side. However, I do see quite a number of fellow diyers stack their transformer. Maybe other experts may comment this. Heatsink in my amp maybe sufficient but not efficient because they are in 3 separate pieces. One of them is significantly hotter than the others. I hope you have single big heatsink in your case. Wallace

11th November 2002, 03:36 PM	#37
herm diyAudio Member Join Date: Mar 2002 Location: Seville, Ohio USA	wchick; As I stated before, I am running the Zen4 in low power mode ( no R1 ). I am dissipating approximately 66 watts in to each 9 inch sink. Using a kitchen thermometer, I measure a temp of 112 degrees over a 62 ambient (fahrenheit). Looks like you will be in good shape with your aleph 5 monos. -herm

11th November 2002, 09:54 PM	#38
wchick diyAudio Member Join Date: Jul 2002 Location: Colorado	Thanks for your info, Herm. Really appreciate. Wallace

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