Try a MOSFET instead of a TIP50
These are variations on the tried-and-true Maida design, which I've used successfully many times in the past - all the way up to 1000V! The problem has always been that high-voltage bipolar transistors have low current gain, so you are forced in many cases to use a Darlington configuration. A buddy of mine just built a Maida variation using a 1000V MOSFET (in a TO-220 package) to stretch the voltage, instead of a Darlington pair. Works great he says. I don't have the part number but I can ask if anyone wants to know. There are surely a large number of high voltage MOSFET types available.
These are variations on the tried-and-true Maida design, which I've used successfully many times in the past - all the way up to 1000V! The problem has always been that high-voltage bipolar transistors have low current gain, so you are forced in many cases to use a Darlington configuration. A buddy of mine just built a Maida variation using a 1000V MOSFET (in a TO-220 package) to stretch the voltage, instead of a Darlington pair. Works great he says. I don't have the part number but I can ask if anyone wants to know. There are surely a large number of high voltage MOSFET types available.
Hello. For a MOS-FET version, check the following site of my friend.
http://www.geocities.jp/shoranosekai/FETDengenKairozu2of2.html
The original design was introduced by Mr. Kato (JA9TTT). His site no more carries the drawings. I have followed his design and enjoy verious kinds of high voltage power supplies for my tube amplifiers.
http://www.geocities.jp/shoranosekai/FETDengenKairozu2of2.html
The original design was introduced by Mr. Kato (JA9TTT). His site no more carries the drawings. I have followed his design and enjoy verious kinds of high voltage power supplies for my tube amplifiers.
Example
Check out the captioned SFM80 Schematic here:
http://www.diyparadiso.com/proj/sfm75.htm
Don't worry about his SRPP comment at the top of the schematic, not a SRPP in sight.
The whole front end circuit is available as a kit or PCB only from Curcio Audio Engineering (CAE). IIRC the PCB-1A. Of course, no circuit value on the schematic at CAEs website.
I've built a few of these - works well.
Cheers,
Ian
Check out the captioned SFM80 Schematic here:
http://www.diyparadiso.com/proj/sfm75.htm
Don't worry about his SRPP comment at the top of the schematic, not a SRPP in sight.
The whole front end circuit is available as a kit or PCB only from Curcio Audio Engineering (CAE). IIRC the PCB-1A. Of course, no circuit value on the schematic at CAEs website.
I've built a few of these - works well.
Cheers,
Ian
Dear all,
Actually, I stored in my home 3 boards for sale.
If somebody need a board i can sale them.
my mail walter_burkhardt@web.de
regards walter
Actually, I stored in my home 3 boards for sale.
If somebody need a board i can sale them.
my mail walter_burkhardt@web.de
regards walter
i think this is what he was looking for (see link)
i have it on file as i have been doing a rig tests on the (new to me) lm78s05cv from kec which has a 2A rating.
the heater sup looks good with a nice 6.3v @ 1.8mA using an old u709 as a test load.
the down-side with these is in the old days they would shut down on overload at only 500mA or so. and leave you with the amp running but with out heaters.
i hope this don't happen with an ecl82 and 9v light bulb per leg.
i have it on file as i have been doing a rig tests on the (new to me) lm78s05cv from kec which has a 2A rating.
the heater sup looks good with a nice 6.3v @ 1.8mA using an old u709 as a test load.
the down-side with these is in the old days they would shut down on overload at only 500mA or so. and leave you with the amp running but with out heaters.
i hope this don't happen with an ecl82 and 9v light bulb per leg.
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