Simplistic Mosfet HV Shunt Regs - Page 201 - diyAudio
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Old 19th September 2011, 07:55 PM   #2001
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Wow, what a thread. Must be interesting but just too long for me to even try to get into. Can someone write down the conclusion and post it in a new seperate thread? Thnx.
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Old 19th September 2011, 08:08 PM   #2002
iko is online now iko  Canada
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That'll be hard. But in a few words, Salas has developed a high voltage shunt regulator which a number of people have implemented and have been really happy with. The latest schematic is somewhere in this thread, sadly, I don't know exactly where.
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Old 19th September 2011, 08:25 PM   #2003
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My personal summary of this thread:
1. According to the late Allen Wright, the power supply quality has 50% responsibility for the sound quality of an amplifier.
2. Shunt Regulators are the best possible regulators - wherever it's possible to use them (it's usually impossible to use them with reactive load, like output transformer or inter-stage transformer{s}). They are the best possible regulators both from the technical-engineering view and from listening reports.
3. Salas Shunt Regulators are easy to build, even with point-to-point wiring, and according to the testimonies of many users - give excellent results.
My bottom line:
The Salas HV Shunt Regulator is the most highly recommended solution to any tube pre-amp, including phono stages - and to the voltage stage(s) of any tube power amp.
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Old 20th September 2011, 10:21 AM   #2004
regal is offline regal  United States
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Quote:
Originally Posted by Joshua_G View Post
My personal summary of this thread:
2. Shunt Regulators are the best possible regulators - wherever it's possible to use them (it's usually impossible to use them with reactive load, like output transformer or inter-stage transformer{s}). They are the best possible regulators both from the technical-engineering view and from listening reports.
.

I know at least two or three of us are using it with output transformer loads without issue. This is a SSHV single feed 5k:32 OPT WE417, 2H-60db, the bump at 60hz(under -100db) is from the power transformer emi into the opt:

Click the image to open in full size.
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Old 20th September 2011, 11:27 AM   #2005
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Quote:
Originally Posted by regal View Post
I know at least two or three of us are using it with output transformer loads without issue.
Indeed, however it looks like a shunt regulator cannot be guarantied to work on all amps with output or inter-stage transformers without any issue.
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Old 24th September 2011, 04:08 AM   #2006
tim845 is offline tim845  Hong Kong
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Quote:
Originally Posted by Salas View Post
Truly unique build. The BC transistors first reg in direct to chassis dead bug wiring! Are you sure you want to dismantle that for a later update?
Hi Salas

I tried to review this thread up to page 192 and cannot find the circuit that matched the above like you said is the latest version. Would you tell me D5 and D7 should be 1N4003 or 12V zener?

Because some latest circuit showed that D5 to D8 is all 12V zener including the redrawn circuit by Mr. Quang Hao.

I just P-to-P again last night but it didn't work. ha ha ha .......................

Thanks

Tim
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Old 24th September 2011, 04:32 AM   #2007
Salas is online now Salas  Greece
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They can be two zeners protecting a gate, or a zener and a reverse biased diode. Firstly take them all types out if in doubt, see if your circuit works without those protections.There could be some other priority to fix or not.
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Old 24th September 2011, 05:12 PM   #2008
tim845 is offline tim845  Hong Kong
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Hi Salas

Problem solved. A very careless mistake:the regulator did not grounded !!!!

A preliminary test is the audible hum, it is very very quite !!!!! The first version I still got an audible buzz......y............., but this time it is nothing can be audible !!

Thanks for your masterpiece !!!!!

Now is mid night in Hong Kong, I have to play it tomorrow.

Tim
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Old 24th September 2011, 05:20 PM   #2009
Salas is online now Salas  Greece
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Nice. Did you leave the diode-zener protection connected to gates as in the drawn circuit when it got grounded and worked?
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Old 25th September 2011, 12:47 AM   #2010
tim845 is offline tim845  Hong Kong
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Quote:
Originally Posted by Salas View Post
Nice. Did you leave the diode-zener protection connected to gates as in the drawn circuit when it got grounded and worked?
The diode - zener protection was disconnected and found no problem, the regulator turned on up to this time seems no problem too and I proposed not to connect this protection.

P-to-P of transistors circuit is very interesting than tube....
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