Hi,
While I am searching for a good circuit for tube preamp, I came across Allen Wright's design and also bought his book about super regulator which happens to be a shunt regulator. Then further searching on the web leads me to here
www.euronet.nl/~aespreng/Shuntregv11d/Manual.pdf
A very well organised and describtive manuel on HPHV shunt regulator which also uses the same idea as Allen's super reg
I wonder if anyone had built this before and have any comment on it? I am ready to build one myself. My question is that whether it is possible to modify the circuit to produce 4A at 550V
I noticed that IRF830 has a capacity of 4.5A
Should I reduce R6 to 0.5R, then the max current for the CCS should increse to 2.5v/0.5R = 5A? Would this work if I use a huge heatsink?
Can I parallel a few more IRF830 to get a higher current in the CCS part?
Can I parallel a few more IRF830 to get a higher current in the shunt part without using tube to increase the shunt current?
While I am searching for a good circuit for tube preamp, I came across Allen Wright's design and also bought his book about super regulator which happens to be a shunt regulator. Then further searching on the web leads me to here
www.euronet.nl/~aespreng/Shuntregv11d/Manual.pdf
A very well organised and describtive manuel on HPHV shunt regulator which also uses the same idea as Allen's super reg
I wonder if anyone had built this before and have any comment on it? I am ready to build one myself. My question is that whether it is possible to modify the circuit to produce 4A at 550V
I noticed that IRF830 has a capacity of 4.5A
Should I reduce R6 to 0.5R, then the max current for the CCS should increse to 2.5v/0.5R = 5A? Would this work if I use a huge heatsink?
Can I parallel a few more IRF830 to get a higher current in the CCS part?
Can I parallel a few more IRF830 to get a higher current in the shunt part without using tube to increase the shunt current?
ackcheng,
IRF830
well, 500volts and 4.5 amp and 74 watts is way out the picture even with an external device...
He gives a little explanation at the end...
Ishunt should be at least 0.2* Iload; lets use 40mA (0.040A). Pshunt = 450 * 0.040 = 18W.
in your case 170 volts * 4A ILoad ==> 680 watts ; its Huge
you would need a MosFet capable of 2000 watts dissipation
and a heathsink to dissipate more than 700 watts....
The transfo would be 1000*3 = 3KVA !!!
Better try an other idea...
Could you tell why you need 170 volts and 4Amps ?
Alain.
IRF830
well, 500volts and 4.5 amp and 74 watts is way out the picture even with an external device...
He gives a little explanation at the end...
Ishunt should be at least 0.2* Iload; lets use 40mA (0.040A). Pshunt = 450 * 0.040 = 18W.
in your case 170 volts * 4A ILoad ==> 680 watts ; its Huge
you would need a MosFet capable of 2000 watts dissipation
and a heathsink to dissipate more than 700 watts....
The transfo would be 1000*3 = 3KVA !!!
Better try an other idea...
Could you tell why you need 170 volts and 4Amps ?
Alain.
"in your case 170 volts * 4A ILoad ==> 680 watts ; its Huge
you would need a MosFet capable of 2000 watts dissipation
and a heathsink to dissipate more than 700 watts....
The transfo would be 1000*3 = 3KVA !!!"
if the Iload is 4A, doesn't that makes the Ishunt 4 x 0.2 = 800ma?
power that the mosfet need to handle would be 170 x 0.8 = 136W?
you would need a MosFet capable of 2000 watts dissipation
and a heathsink to dissipate more than 700 watts....
The transfo would be 1000*3 = 3KVA !!!"
if the Iload is 4A, doesn't that makes the Ishunt 4 x 0.2 = 800ma?
power that the mosfet need to handle would be 170 x 0.8 = 136W?
ackcheng,
I am working on a SE 6C33C-C 18 watts ... little world ! {Simplex from Ari Polisois}
In your case if you want dynamics, the power supplies must have a lot
of reserve and a PS 4*200 mA in average would have to pass 3 or 4 times this
in peak... so 800*3 ==> 2400/3200 mA
{Its pure class A and the transfo must have room about 2* to 3* average current}
You understand why there are no regulators on such configurations
as OTL with 4 * 6C33C-B's amplifiers ... but huge 1600 microF 250Volts cap's
For my SE the winding for the B+ will give 270 Volts at max 0.9A {average 250mA}
that's only for 1 tube !
I'll have 2 * 330 VA transformers ; 1 for each monobloc.
Alain.
I am working on a SE 6C33C-C 18 watts ... little world ! {Simplex from Ari Polisois}
In your case if you want dynamics, the power supplies must have a lot
of reserve and a PS 4*200 mA in average would have to pass 3 or 4 times this
in peak... so 800*3 ==> 2400/3200 mA
{Its pure class A and the transfo must have room about 2* to 3* average current}
You understand why there are no regulators on such configurations
as OTL with 4 * 6C33C-B's amplifiers ... but huge 1600 microF 250Volts cap's
For my SE the winding for the B+ will give 270 Volts at max 0.9A {average 250mA}
that's only for 1 tube !
I'll have 2 * 330 VA transformers ; 1 for each monobloc.
Alain.
ackcheng,
No no need to go further than the peak current.
0.8 to 3.0 Amps peak = about 170*3 = min 510 VA to 680VA by channel
only for the B+
42 watts for eah heater = 4 * 42 * coeff 1.5 ==> 168VA to 250 VA
You are already at 930 VA by channel. + Add some more for the driver stage
Did you take a look at heatsinks for about 130 watts ... without a fan
it's huge. Plus the MosFet must be about 5 amps average and 175 watts...
But now, you understand that it's huge to regulate even 3 amps at 170 volts!
Good luck in your project.
Alain.
No no need to go further than the peak current.
0.8 to 3.0 Amps peak = about 170*3 = min 510 VA to 680VA by channel
only for the B+
42 watts for eah heater = 4 * 42 * coeff 1.5 ==> 168VA to 250 VA
You are already at 930 VA by channel. + Add some more for the driver stage
Did you take a look at heatsinks for about 130 watts ... without a fan
it's huge. Plus the MosFet must be about 5 amps average and 175 watts...
But now, you understand that it's huge to regulate even 3 amps at 170 volts!
Good luck in your project.
Alain.
ackcheng,
I have been thinking about your project, and my opinion is that a "shunt regulator"
will be detrimental, you need to let pass as much current as possible
otherwise the dynamic will be stretched!
You can start without it, at first ; them insert it in the circuit to compare.
PS: reserve the "shunt regulator" for the driver stage.
Regards.
Alain.
I have been thinking about your project, and my opinion is that a "shunt regulator"
will be detrimental, you need to let pass as much current as possible
otherwise the dynamic will be stretched!
You can start without it, at first ; them insert it in the circuit to compare.
PS: reserve the "shunt regulator" for the driver stage.
Regards.
Alain.
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