Frank's 6sn7 preamp

losacco · 19th October 2010, 12:47 AM

I’m looking for a tube rectified power supply for Frank,s 6sn7 preamp. I have done a search and have come up empty. Parts I have, Hammond 270BX(550V-50mA), 5u4gb rectifier. I would like to try designing one myself but don’t know where to begin.

Any help on a power supply for this preamp would be appreciated. Mean while I'll keep searching.
Thanks

mikvous · 19th October 2010, 11:21 AM

What's your B+ target? If I remember well it should be around 250 V.

losacco · 19th October 2010, 11:59 AM

yes, 250v b+

mikvous · 19th October 2010, 12:01 PM

So your trafo is 275V AC center tap @ 100 ma?

losacco · 19th October 2010, 01:28 PM

275V AC, 50mA

mikvous · 19th October 2010, 02:27 PM

Ok, I believe it's enough.What I've done is a simple CRC (220 uf-50 ohm-220 uf) and after that Salas HV shunt regulator @ 30-40 mA with amazing results.You must have at least 265 V before the regulator to regulate @250V.
Which version of the preamp are you building,the direct coupled or the cap coupled?
I prefer the direct coupled one.

losacco · 19th October 2010, 02:34 PM

direct coupled

losacco · 19th October 2010, 03:18 PM

mikvous, do you have schematic of this power supply?

porkchop61 · 19th October 2010, 03:45 PM

Here's what I'm using:
http://webpages.charter.net/porkchop...s_ultimate.jpg
Only because it's a PT that I had on hand scavenged from an old HAM radio. Some of the cap and resistor values may have changed slightly, but it's basically the same circuit. I think I have a 100uF as the last cap now. I was trying to tune the output voltage to the 250V using the resistors. Probably a waste of power for the tranny as it was made to supply more tubes than I am now using, but again I already had it.
Mine's dead quiet with this power supply.

mikvous · 19th October 2010, 05:59 PM

Take a look at Power Supplies ,thread: Simplistic Mosfet HV Shunt Regs ,post: 1198

19th October 2010, 12:47 AM	#1
losacco diyAudio Member Join Date: Dec 2008	Frank's 6sn7 preamp I’m looking for a tube rectified power supply for Frank,s 6sn7 preamp. I have done a search and have come up empty. Parts I have, Hammond 270BX(550V-50mA), 5u4gb rectifier. I would like to try designing one myself but don’t know where to begin. Any help on a power supply for this preamp would be appreciated. Mean while I'll keep searching. Thanks

19th October 2010, 01:28 PM	#5
losacco diyAudio Member Join Date: Dec 2008	275V AC, 50mA 275V AC, 50mA

19th October 2010, 02:34 PM	#7
losacco diyAudio Member Join Date: Dec 2008	direct coupled direct coupled

19th October 2010, 03:18 PM	#8
losacco diyAudio Member Join Date: Dec 2008	schematic mikvous, do you have schematic of this power supply?

19th October 2010, 03:45 PM	#9
porkchop61 diyAudio Member Join Date: Aug 2004 Location: Mansfield, Connecticut	Here's what I'm using: http://webpages.charter.net/porkchop...s_ultimate.jpg Only because it's a PT that I had on hand scavenged from an old HAM radio. Some of the cap and resistor values may have changed slightly, but it's basically the same circuit. I think I have a 100uF as the last cap now. I was trying to tune the output voltage to the 250V using the resistors. Probably a waste of power for the tranny as it was made to supply more tubes than I am now using, but again I already had it. Mine's dead quiet with this power supply. __________________ "Imagination is more important than knowledge"

19th October 2010, 11:21 AM	#2
mikvous diyAudio Member Join Date: Nov 2006	What's your B+ target? If I remember well it should be around 250 V.

19th October 2010, 11:59 AM	#3
losacco diyAudio Member Join Date: Dec 2008	yes, 250v b+

19th October 2010, 12:01 PM	#4
mikvous diyAudio Member Join Date: Nov 2006	So your trafo is 275V AC center tap @ 100 ma?

19th October 2010, 02:27 PM	#6
mikvous diyAudio Member Join Date: Nov 2006	Ok, I believe it's enough.What I've done is a simple CRC (220 uf-50 ohm-220 uf) and after that Salas HV shunt regulator @ 30-40 mA with amazing results.You must have at least 265 V before the regulator to regulate @250V. Which version of the preamp are you building,the direct coupled or the cap coupled? I prefer the direct coupled one.

19th October 2010, 05:59 PM	#10
mikvous diyAudio Member Join Date: Nov 2006	Take a look at Power Supplies ,thread: Simplistic Mosfet HV Shunt Regs ,post: 1198

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