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Old 19th October 2010, 12:47 AM   #1
losacco is offline losacco  United States
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Default Frank's 6sn7 preamp

Iím 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 donít know where to begin.

Any help on a power supply for this preamp would be appreciated. Mean while I'll keep searching.
Thanks
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Old 19th October 2010, 11:21 AM   #2
mikvous is offline mikvous  Greece
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What's your B+ target? If I remember well it should be around 250 V.
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Old 19th October 2010, 11:59 AM   #3
losacco is offline losacco  United States
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yes, 250v b+
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Old 19th October 2010, 12:01 PM   #4
mikvous is offline mikvous  Greece
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So your trafo is 275V AC center tap @ 100 ma?
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Old 19th October 2010, 01:28 PM   #5
losacco is offline losacco  United States
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Default 275V AC, 50mA

275V AC, 50mA
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Old 19th October 2010, 02:27 PM   #6
mikvous is offline mikvous  Greece
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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.
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Old 19th October 2010, 02:34 PM   #7
losacco is offline losacco  United States
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Default direct coupled

direct coupled
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Old 19th October 2010, 03:18 PM   #8
losacco is offline losacco  United States
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Default schematic

mikvous, do you have schematic of this power supply?
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Old 19th October 2010, 03:45 PM   #9
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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.
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Old 19th October 2010, 05:59 PM   #10
mikvous is offline mikvous  Greece
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Take a look at Power Supplies ,thread: Simplistic Mosfet HV Shunt Regs ,post: 1198
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