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Old 8th October 2005, 09:18 PM   #81
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After Googling some, it doesn't look to me that specs are the strong point with some of these tubes.
Looking at the specs myself I don't see any problem in using the 6HV5. Actually, I believe it will perform better because the Ra is lower.

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if you indeed have built one of these beasts.................
If you want to have a look at my amp, well here it is:

HVamp

Dick
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Old 8th October 2005, 10:10 PM   #82
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Default After Googling some, it doesn't look to me that specs .......

Sorry I wasn't more clear here,....just meant that from what I was able to come across that info seemed to be somewhat limited. I wonder about pinout compatibility, but it may be a moot point with your guy's custom setups. Dj - Nice looking OTL..... How easy is it to work on though if something went wrong? Do the panels fold out or anything? It definitely looks like you put some time into this one!
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Old 8th October 2005, 10:23 PM   #83
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It definitely looks like you put some time into this one!
Indeed, even though I can say I'm pretty well experienced.

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How easy is it to work on though if something went wrong? Do the panels fold out or anything?
For servicing this approach is not very handy, nothing folds out.
I had to put everything in this 19" case as I don't have room for 2 seperate ones. Plus everything has to be safe for my children.
As the amp is in a closet under the stairs to the next floor, the noise of the fans can't be heard.

Dick.
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Old 9th October 2005, 12:17 AM   #84
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Dj - I seem to recall from a past thread that were into developing an all-tube approach. Do you keep the EQ intact or just run the signal straight? I can respect the proprietary nature of the circuit no matter what you're approach and have read about past amps employing an all tube circuit, but never have been able to learn much about them. I think it might be because nobody really knows except the designer.... Wish I could read the language of your website, might learn a thing or two.........sigh.
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Old 9th October 2005, 03:39 AM   #85
sasha is offline sasha  Canada
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This is what I have built so far.
To assemble one board doesn't take too much time 2-3 hours.
And there is 4 boards for 2 channels. High voltage supply is cascaded
6 separate transformers each giving 800V. This is actually 220V/12V
step-down transformers put backwards and 12V side in series to
fit 110V input. Well, each transformer will see more than rated 12V
but in my case no overheating. With help of voltage doubler circuit
I was able to get over 800V from each transformer.
Power supply is around 250W, which considering max. allowed
dissipation of the 4 tubes (4x30W=120W) is OK.
To get custom made power transformer cost a fortune.
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Old 9th October 2005, 03:40 AM   #86
sasha is offline sasha  Canada
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More pix
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Old 9th October 2005, 03:42 AM   #87
sasha is offline sasha  Canada
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This is candidat for amp case.
Old Kenwood.
It might even look good.
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Old 9th October 2005, 05:49 PM   #88
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Do you keep the EQ intact or just run the signal straight?
RetroAudio, I first tried the amp straight as I also wondered why Acoustat made that EQ filter. The amp sounded way to bright.
This was tried on several ESL (Acoustat, Final700, Audiostatic100) with all the same result.
Hence the reason for this EQ, which is a low pass filter. I made a simple filter (R-C-Pot in series) after the first stage to ground, and with the pot you can adjust the right balance of high/mid of the sound.

On the website there is no information but general stuff.

Sasha, I have a custom made HV xformer, with 2000V secondary on a 250VA core. Paid about 75 euros, =90 US$, for it.
BTW, nice pictures.

Dick.
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Old 9th October 2005, 07:07 PM   #89
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Dj - that's been my experience as well with the EQ. I have run rough freq. response plots to verify (I was playing around, do my best work that way) and found the low-pass filter as well as the hi-freq boost. The hi-freq adjustment is amazingly touchy and one can tell the difference when the circuit is cleaned up with better components, at least I can. Stats seem to need this EQ in general from what I have gathered. I have heard of others sticking the servo up to other panels and reported it sounded just fine. Of course, some measuring would be needed to get it just right, a capability not everyone has. I don't know, these projects never seem to end cause there's always something left to do.

Sasha - keep up the work! You'll learn things as you go and will be the better designer for it. I think you've undertaken a very respectable project, but please be careful for everyone's sake!
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Old 9th October 2005, 09:01 PM   #90
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The EQ has to be adjusted if an other panel is connected.
On the original servo there are 2 user selectable EQs depending on the distance to the wall at the back of the panels. The main difference is in the low frequencies.
Ofcourse these EQ where designed to suit the 3 panels that came with each of them.

The Hi-freq is mandatory or else the panels will sound to bright.

The original Acoustat servo amp suffer from to slow and outdated op-amps, introducing distorsion with todays high class music sources. Listen to piano for example.
Introducing better components can improve it , but this flaw will always remain unless you do a major circuit update.

Dick.
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