Simplistic Mosfet HV Shunt Regs - Page 51 - diyAudio
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Old 29th August 2009, 04:49 AM   #501
Ryssen is offline Ryssen  Sweden
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2 driver tubes at 20mA each total of 40ma.That would be 6,8w double the current 80mA=13,6w.
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Old 29th August 2009, 10:41 AM   #502
Salas is online now Salas  Greece
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The CCS Mosfet can take up to 200V across it. Haven't used such a Vin - Vout though. You are talking 170V at 80mA through it. I would at least clamp it with a 190V 5W Zener across and 12V 0.25W Zener from G to S, as well as the output one from S to G, directly on the pins. All Zener cathodes looking up as we view the schematic. Because a small transient would kill easily at such margins. R1=33R at 170Vdiff for 80mA. On the other hand, why not kill some voltage on a series of RC filter stages, so to get the dif down to 70V and benefit by pre smoothing the reg's final Vin a lot?
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Old 29th August 2009, 10:56 AM   #503
Ryssen is offline Ryssen  Sweden
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Ok,thanks.
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Old 29th August 2009, 11:42 AM   #504
Stixx is offline Stixx  Germany
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I eventually got the headphone amplifier breadboarded that my first HV shunt was intended for. As a reminder: SE spud using D3A, C3G or E810F (playing right now), vintage Saba opt's and so on...
For testing I initally used a Maida reg at 145V since the Salas' shunt is a bit more ...err... sensitive to prying around with probes, disconnecting and connecting and such
The sonic result wasn't exactly overwhelming (even after burn in) so I put the shunt regulator to use.

and to Salas again! Don't want to repeat myself too often, but what a difference! The shunt is playing at 75mA for about 42mA consumption at 142V (the lower limit of the trimpot) and beats the Maida by a very comfortable margin... Open, sweet, subtle and authentic... very nice!
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Old 29th August 2009, 12:23 PM   #505
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well done !!

Ps don't use mdf is carcinogen.....
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Old 29th August 2009, 02:04 PM   #506
Salas is online now Salas  Greece
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Quote:
Originally Posted by Stixx View Post
I eventually got the headphone amplifier breadboarded that my first HV shunt was intended for. As a reminder: SE spud using D3A, C3G or E810F (playing right now), vintage Saba opt's and so on...
For testing I initally used a Maida reg at 145V since the Salas' shunt is a bit more ...err... sensitive to prying around with probes, disconnecting and connecting and such
The sonic result wasn't exactly overwhelming (even after burn in) so I put the shunt regulator to use.

and to Salas again! Don't want to repeat myself too often, but what a difference! The shunt is playing at 75mA for about 42mA consumption at 142V (the lower limit of the trimpot) and beats the Maida by a very comfortable margin... Open, sweet, subtle and authentic... very nice!
Good to know it has served you well in several occasions. Happy listening.
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Old 8th September 2009, 03:45 PM   #507
disco is offline disco  Netherlands
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Still waiting for those A94 to arrive...

Nice bottles you use for the headphones Stixx.
Is the schematic on line?
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Old 8th September 2009, 06:10 PM   #508
Stixx is offline Stixx  Germany
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Those bottles are 6D22s halfwave rectifiers... the rest is a very straightforward single tube SE-schematic.
The schematic is now online , shown with the D3A though.. Also bias is now with an orange LED at around 21mA for the E810F.
Not sure about this tube yet, also i am still having a tiny bit of hum on one channel probably due to wiring...
Next in line is C3G which I am using successfully in another headphone amplifier.
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Old 8th September 2009, 06:54 PM   #509
Ryssen is offline Ryssen  Sweden
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Do you have a picture with higher resolution?
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Old 9th September 2009, 07:11 AM   #510
Stixx is offline Stixx  Germany
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I should be readable when you fully enlarge it (first zoom it and than extend in lower left corner).
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