Help with AD30 PSU build

gcp · 5th July 2011, 02:57 PM

I'm building an Orange AD30 clone from tubes/trafos from a Leslie 610.

The Orange has what I consider a typical PSU with single rectifier and voltage divider to provide B+ to run the 12ax7 preamp tubes and the EL84 power amp tubes.
http://users.telenet.be/orangefg/OFG_SCHEM/AD15main.jpg

The Leslie has what I consider a slightly odd PSU with a combination of two secondaries in various configurations to get required voltages to run its single 12ax7 preamp and 7189 power amp tubes.
http://www.captain-foldback.com/Lesl...matics/610.gif

I'm planning on continuing to use the 7189's in the clone I'm making, and they're tolerant of the higher B+ from the Leslie (as thats what it was designed for).
Instead of running 332V and 326V on output tubes plate and screen, respectively...I'll be running 400V and 300V on plates and screens, respectively. Preamp and PI tubes will use the 215V rail.

Does anyone see anything glaringly wrong with my plan?

DigitalJunkie · 6th July 2011, 01:19 AM

I've done similar 'supply stacking' schemes before,and it usually works out fine.

I might have put the 215V and 125V divider on the lower 300V winding,just so that the dissipation in the resistors would be lower,but maybe that's just me.

GavinPaddock · 6th July 2011, 01:38 AM

Thanks DigitalJunkie! As I don't have any other specs on power tranny performace (though it should be fine) I think I'll refresh the caps and keep it stock. Thanks for the heads up though!

5th July 2011, 02:57 PM	#1
gcp diyAudio Member Join Date: Jul 2011	Help with AD30 PSU build I'm building an Orange AD30 clone from tubes/trafos from a Leslie 610. The Orange has what I consider a typical PSU with single rectifier and voltage divider to provide B+ to run the 12ax7 preamp tubes and the EL84 power amp tubes. http://users.telenet.be/orangefg/OFG_SCHEM/AD15main.jpg The Leslie has what I consider a slightly odd PSU with a combination of two secondaries in various configurations to get required voltages to run its single 12ax7 preamp and 7189 power amp tubes. http://www.captain-foldback.com/Lesl...matics/610.gif I'm planning on continuing to use the 7189's in the clone I'm making, and they're tolerant of the higher B+ from the Leslie (as thats what it was designed for). Instead of running 332V and 326V on output tubes plate and screen, respectively...I'll be running 400V and 300V on plates and screens, respectively. Preamp and PI tubes will use the 215V rail. Does anyone see anything glaringly wrong with my plan?

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6th July 2011, 01:19 AM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	I've done similar 'supply stacking' schemes before,and it usually works out fine. I might have put the 215V and 125V divider on the lower 300V winding,just so that the dissipation in the resistors would be lower,but maybe that's just me.

6th July 2011, 01:38 AM	#3
GavinPaddock diyAudio Member Join Date: May 2009	Thanks DigitalJunkie! As I don't have any other specs on power tranny performace (though it should be fine) I think I'll refresh the caps and keep it stock. Thanks for the heads up though!

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