Simplistic MosFET HV Shunt Regs

[marcus1]

Hi pidesd

I've got the eXStata as well - what areas are improved using the Salas reg over the standard eXStata supply?

Thanks

i ve been giving juice to my exstata (The eXStatA Electrostatic Amplifier) with my prototype bipolar salas reg for a handful of hours now and so far i have not noticed any sign of oscillation or malfunction and it sounds great (how surprising? ). in the meantime i ve been working on a final compact version but i cant make it work. but i highly suspect the problem comes from some kind of mishandling from me . i ll give updates when i try to debug it. as usual, pictures not available ...for now

 

[Tfan69]

Salas, what are the upper limits (tested and theoretical) of the circuit? could it achieve 475v@250mA somehow? it would be nice to try it in a kt88 monoblock power amp i'm thinking to build in the next months

 

[Salas]

Power amps are reactive and it will need very high idle CCS at high B+, it will surely break down by heat if not from oscillation.

 

[Tfan69]

i see.. well nevermind i tried

 

[pidesd]

marcus,

i have not tried the default PSU from cavalli but i doubt the salas reg is inferior... but also maybe there is no audible difference. there is no way to tell for sure until both are compared but noise output is less from salas shunt, i m pretty sure about that.

but try it for yourself and let us know. i m curious about it too. it s as easy as diy can get...well almost

i m using a crcrc 200uf-200r-...

but more capacitance or use of inductors might boost performance.

 

[dvb projekt]

Hi Salas,

as you perhaps know, my Tube-I-zator use a unregulated psu for the B+.
With the experiences from your low voltage shunt in my mind , i have made an upgrade module for the Tube-I-zator based on your circuit design.

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An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

The first power up runs perfect!

An externally hosted image should be here but it was not working when we last tested it.

After a light output voltage drift in the first minutes, it stand´s solid at the wanted 150V voltage (Input 170V).

In my case the two 6N2P tubes need´s ~3mA together, so i think i could stay with the 56R current adj. resistor.

I am really looking forward to the weekend when i have time to test it in my circuit.

Best regards,
Oliver

P.S.: I have only made a few pcb´s, so no additional GB for this.

 

[Salas]

Isn't your Curadj res a bit small for size? Is it getting hot? OK not for 35mA, but if you want to use in another app. I also see you use the 150V protection Zener nearly directly on pins. Good.

 

[dvb projekt]

I coudn´t wait till weekend....

An externally hosted image should be here but it was not working when we last tested it.

I prepared my Tube-I-zator module for this upgrades. Just get rid of the bridges for the two B+ Lines, integrate the shunt and make a new bridge to power both output lines...

An externally hosted image should be here but it was not working when we last tested it.

... and it´s sound H o l o g r a p h i c




No it´s time to take all projects in a nice case, before my wife......kicks me in my butt.

An externally hosted image should be here but it was not working when we last tested it.

 

[Salas]

Look dear! No electrolytics in my high voltage! Look honey...eat in restaurants till 2011!

 

[dvb projekt]

 

[j45yip]

Forced Cooling and Heatsink.

Hi Salas,

I'm planning to use my left-over P3 CPU heatsink with cooling fan for Q1 & Q3. Is it enough to do the job?

 

[Salas]

You estimate your power dissipation by voltage times current across Mosfets and if the CPU cooling system is specified for as many or more Watt then you know its good for the job.

 

[regal]

High Salas, for pre-filtering is a 1 mV ripple OK or should it be filtered further?

 

[Salas]

Excellent figure.

 

[Sheldon]

Salas,

Used you design (or minor variation thereof) to good effect here: http://www.diyaudio.com/forums/tubes-valves/169428-unholy-alliance-phono-amp.html
Thanks,
Sheldon

 

[Salas]

You mean the depletion CCS? Handy, I use it too some times. I prefer the standard a bit better tonally that's all. Maybe 2uF across the lower Rref? Nice DIY BTW. Congrats.

 

[Sheldon]

You mean the depletion CCS? Handy, I use it too some times. I prefer the standard a bit better tonally that's all. Maybe 2uF across the lower Rref? Nice DIY BTW. Congrats.

Yes, I had those parts in the bin already. Good point on the decoupling cap. Can easily parallel in another cap.


Sheldon

 

[Bengali]

Hi Salas,

on BAS PSU (CRC), output of +B has resistor divder to reference Heater (-).

do I still use the BAS resistor divider or I should put one on output of the HV shunt? does it matter which way?

I have the following:

trafo --> BAS PSU(tube recitifer, 220V) --> HV Shunt(200V, 45mA) --> +B Aikido

Thanks.

 

[Salas]

Keep it where it was. Don't put extra things across output. If the voltage you get now is in data sheet's range to shield the heater, no difference.

 

[merlin el mago]

Hi guys,

Please could you help me, for my pre-amp AN x 4 6922 SRPP I'm looking for a schematic for B+ 165 Vout I will use these PSU posted by Salas instead the Maida because I want to do the Simplistic Mosfet HV Shunt Regs.

SRPP schematic

An externally hosted image should be here but it was not working when we last tested it.

Also for a friend that owns a MM PXXXXX P10 I want to do the SMHVSR

An externally hosted image should be here but it was not working when we last tested it.