2SK117 is alright substitute. Don't drop 100V across the reg, its wasted heat and bigger sinks. Drop it in RC steps before, so you pre-filter also. Even 20V in-out will be more than good. Don't know about D1 in Quanghao's, had some problems he wrote, was blowing the 9610, but that was with his first try, had significant layout distance. Keep a spare 9610 and try underneath it directly with D1. Its good for general safety to be there if it does not blow anything. If it does, replace 9610, take D1 out and forget about it. In my P2P it did not blow something. OTOH a DIYer told me the reg even survived some output short without any guard Zeners at all, but sounds like pulling a wheelie without a helmet.
I would start 33R R1. But would check it passes 70mA. LEDS & VGS vary. 68K R3 5W good for circa 350V in.
I would start 33R R1. But would check it passes 70mA. LEDS & VGS vary. 68K R3 5W good for circa 350V in.
Argh! Farnell hasn't 2SK117 and 2Sk170, and RS the first will be available at the end of this month
Salas, any other equivalent transistor available on rs or farnell?
Like 2sk170.
zenner diode protect 9160 and 840 you can use 6V to 12V /1/2W
Salas,
As promissed, I report on the performance of the HV shunt reg. As I told you I installed it in my tube preamplifier. For information, this preamp is a Curcio Daniel-II. It is already an excellent machine that I had a chance to compare several times againts the best gears on the market. It always ranked among the top.
I initiated many upgrades since its construction with significant improvements on sound with any of them. I though I had come to the end until I upgraded the regulator section with a Guido Tent fixed 15V shunt regulator and your HV shunt regulator.
Both these upgrades made a huge difference in sound quality. Among my first impressions, I noticed reduce noise, better overall definition, exeptional image with pin point location of musicians and performers. I also found deeper sound stage, and clear reproduction of concert hall or studio reverberation when there is.
The upgrades where made in two steps, the Tent Lab first, so I could apppreciate the improvements gained with it. I did listen to it for several weeks until I could finaly find time and opportunity to install your HV shunt.
The HV shunt makes even more difference than the Tent Lab alone, but their action adds up to give the preamp outstanding performances.
Beside continuing the listening sessions, I will make comparisons with other high end preamplifiers and report on my findings.
This is well done Salas, an excellent design, great boards.
I can only thank both of you for the efforts and recommand to anyone desiring to build a performing HV shunt regulator, to try this one.
As promissed, I report on the performance of the HV shunt reg. As I told you I installed it in my tube preamplifier. For information, this preamp is a Curcio Daniel-II. It is already an excellent machine that I had a chance to compare several times againts the best gears on the market. It always ranked among the top.
I initiated many upgrades since its construction with significant improvements on sound with any of them. I though I had come to the end until I upgraded the regulator section with a Guido Tent fixed 15V shunt regulator and your HV shunt regulator.
Both these upgrades made a huge difference in sound quality. Among my first impressions, I noticed reduce noise, better overall definition, exeptional image with pin point location of musicians and performers. I also found deeper sound stage, and clear reproduction of concert hall or studio reverberation when there is.
The upgrades where made in two steps, the Tent Lab first, so I could apppreciate the improvements gained with it. I did listen to it for several weeks until I could finaly find time and opportunity to install your HV shunt.
The HV shunt makes even more difference than the Tent Lab alone, but their action adds up to give the preamp outstanding performances.
Beside continuing the listening sessions, I will make comparisons with other high end preamplifiers and report on my findings.
This is well done Salas, an excellent design, great boards.
I can only thank both of you for the efforts and recommand to anyone desiring to build a performing HV shunt regulator, to try this one.
I will try to theoretically mirror one so you can try instead and tell us if it works.
It replaces the 7815 as IC1 in the Master Regulator. It is floating on top of the high voltage supply between VCC and VEE. It is used to power the op amp in the line amplifier.
The included diagrams should explain it all.
Thank you
Attachments
thank you.
and may the force be with me indeed.
one question:
what is the most proven pre reg filter for this reg so far? do you think 220uf+470r+220uf would be a safe choice, as i ve seen a couple time here before?
edit: also, what i want to power with this reg (exstata) requires 300Vout. any change required to the circuit (+ and - reg)?
and may the force be with me indeed.
one question:
what is the most proven pre reg filter for this reg so far? do you think 220uf+470r+220uf would be a safe choice, as i ve seen a couple time here before?
edit: also, what i want to power with this reg (exstata) requires 300Vout. any change required to the circuit (+ and - reg)?
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Some builder have shown SSHV DVM photos with the MJE350 holding even at over 300V (which is its spec). So give it +/-320V DC input and go +/-300V with the trimmers. What is the +/-ma that your electrostatic headphones amp will consume? Needed info.
CLC pre filter people say its subjectively better. CRC is nice for sizing the input voltage when trafos and mains aren't exact on the other hand.
CLC pre filter people say its subjectively better. CRC is nice for sizing the input voltage when trafos and mains aren't exact on the other hand.