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Old 28th October 2012, 10:59 PM   #3411
Salas is offline Salas  Greece
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Quote:
Originally Posted by roger57 View Post
Yes - after 3 hours. It was set to exactly 374, so it's out by 300mV. Salas should be happy with that.
That's impressive drift indeed for that scale of voltage in a hot reg when coming from an innocent for noise and complexity JFET and resistor non feedback Ref. What is it 0.08%? And we can trust the FLUKE 45 stability I guess.

Nice amps by the way.
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Old 28th October 2012, 11:09 PM   #3412
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
That's impressive drift indeed for that scale of voltage in a hot reg when coming from an innocent for noise and complexity JFET and resistor non feedback Ref. What is it 0.08%? And we can trust the FLUKE 45 stability I guess.
If you're happy...I'm there too.

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Nice amps by the way.
Thanks! (they were only 18 months in the planning and building of the 2 sets)

As I mentioned, my only concern - if it's one at all, is the very dynamic nature and magnitude of the screen current. With the low z out of the SSHV2, it should handle this well.
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Old 28th October 2012, 11:19 PM   #3413
Salas is offline Salas  Greece
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Power amps are weird in how they receive regulation. You will test in practice soon.
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Old 28th October 2012, 11:25 PM   #3414
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Quote:
Originally Posted by Salas View Post
There is SSHV1 negative.
Hi Salas,
A general question (to all).
When there is a separate power transformer winding for negative supply (either low or high voltage), is there any possible drawback in using a positive regulator for that negative supply?
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Old 28th October 2012, 11:27 PM   #3415
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
Power amps are weird in how they receive regulation. You will test in practice soon.
I've been using the Maida (LT1085) regulator with an IRF840 for a pass element for both screen and driver. When I was doing the build originally, you had not yet done the SSHV2. I went with the Maida because it was stable and I had done lots of bench testing. That's all changed now. The large filter caps I required for the linear regulators (100uF) on the amplifier will become unconnected monoliths.
Just waiting for teabag to finalize his group buy and once I have another board, I will begin testing on the amp.

Thanks!
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Old 28th October 2012, 11:33 PM   #3416
Salas is offline Salas  Greece
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Quote:
Originally Posted by Joshua_G View Post
Hi Salas,
A general question (to all).
When there is a separate power transformer winding for negative supply (either low or high voltage), is there any possible drawback in using a positive regulator for that negative supply?
To the contrary, using two positives with two bridges arrangement, gives you two identical same genre semiconductor circuits and ground loop safety.
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Old 28th October 2012, 11:42 PM   #3417
10y is offline 10y  Italy
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Originally Posted by Salas View Post
There is SSHV1 negative.
Hi Salas,

thanks for your quick replay.

Where can I find it?


Anto
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Old 28th October 2012, 11:54 PM   #3418
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To the contrary, using two positives with two bridges arrangement, gives you two identical same genre semiconductor circuits and ground loop safety.
Thanks.
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Old 29th October 2012, 12:20 AM   #3419
Salas is offline Salas  Greece
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Originally Posted by 10y View Post
Hi Salas,

thanks for your quick replay.

Where can I find it?


Anto
It was a few pages behind I mentioned it again, but here again not to be searching.
Attached Images
File Type: png MirrorSSHV1.png (33.4 KB, 235 views)
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Old 1st November 2012, 02:59 PM   #3420
10y is offline 10y  Italy
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Thank you Salas

Another question would I ask : is it possible to change some parts in order to make sshv1/2 usable for B+ around or over 500 V ?
Ciao,

Anto
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