6sn7 Preamp power supply - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th August 2008, 11:40 PM   #1
diyAudio Member
 
ambience exists's Avatar
 
Join Date: Jun 2008
Default 6sn7 Preamp power supply

I found this design from a google search that got some good feedback, and I want to build it because I have been looking for a good 6sn7 preamp. I also found a power supply, but it seems like the transformer has an odd VAC, and the regulator s a bit complex and out of my tight, tight budget. Is there a good 250v B+ design that uses either SS or tube rec. and uses a common transformer voltage? Any help would be greatly appreciated.

Thanks, ((AE))
Attached Images
File Type: gif frank-6sn7-linestages.gif (11.3 KB, 1296 views)
__________________
((AE))
  Reply With Quote
Old 20th August 2008, 11:41 PM   #2
diyAudio Member
 
ambience exists's Avatar
 
Join Date: Jun 2008
Here is the PS in question:

I don't mind using a SS rec. if it is properly snubbed, for cost reasons.
Attached Images
File Type: gif psu_250vdc_simple.gif (11.0 KB, 1229 views)
__________________
((AE))
  Reply With Quote
Old 20th August 2008, 11:56 PM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
That's Frank de Grove's design, a very solid one. I'd probably update the supply a bit (high speed diodes are cheap these days), but if you build it as-is, you'll have a fine performer.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 21st August 2008, 02:29 AM   #4
athos56 is offline athos56  United States
diyAudio Member
 
athos56's Avatar
 
Join Date: May 2006
Location: Yakima, Washington
Default How about this

Parts from Angela and Antique Elec Supp. As far as my knowledge of PSUD II is concerned it looks like a fast, low ripple psu. Nothing fancy. I'm thinking of trying myself.
Attached Images
File Type: jpg untitled.jpg (44.5 KB, 1048 views)
  Reply With Quote
Old 21st August 2008, 02:49 PM   #5
diyAudio Member
 
ambience exists's Avatar
 
Join Date: Jun 2008
That looks nice, but pardon my noobness: what is the symbol at the end of the circuit?

Thanks for the reply.

Also, does anyone have a SS suggestion?
__________________
((AE))
  Reply With Quote
Old 21st August 2008, 02:53 PM   #6
diyAudio Member
 
ambience exists's Avatar
 
Join Date: Jun 2008
Sorry for the double post, but I have a power transformer in my parts box but it has no markings on it. It looks center tapped. How do I find out what kind of voltage will come out of it without killing myself? It would be nice to use some iron I already own.
__________________
((AE))
  Reply With Quote
Old 21st August 2008, 05:51 PM   #7
athos56 is offline athos56  United States
diyAudio Member
 
athos56's Avatar
 
Join Date: May 2006
Location: Yakima, Washington
Quote:
Originally posted by ambience exists
That looks nice, but pardon my noobness: what is the symbol at the end of the circuit?

Thanks for the reply.

Also, does anyone have a SS suggestion?
The symbol at the end is my best guess at the current draw of the preamp.

About your transformer, I'm sure there is a propper way other then just plugging it in and measuring the leads with a meter (which is likely not a wise thing to do) so I'll let someone else field that question.
  Reply With Quote
Old 21st August 2008, 06:42 PM   #8
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Actually, that's a fine way of doing it; it will give you the off-load voltage, and by plugging that in to their calculator along with primary and secondary resistances, you can get a decent representation of your transformer.

But there's danger involved, so watch the voltages.

There's a very nice solid-state regulator kit that should work well with this preamp circuit:

http://tech-diy.com/DIY_PWR_LastPass.htm
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 21st August 2008, 06:48 PM   #9
diyAudio Member
 
ambience exists's Avatar
 
Join Date: Jun 2008
So.. that kit would be the whole supply? hook it right up to the xformer? Looks very cool and noob friendly. I like PCB's!

When I am figuring out this power transformer, what else should I measure besides the volts coming out of the other end?

How do I get the primary and secondary resistances?

Once I get the volts, I'll post the results so maybe someone will know what it is comparable to what I could get new.

My real question: What if it ends up too large? Could I use a resistor to drop the voltage before it goes into the regulator(I have decided I like that kit)? I guess I am just confused about how much of the power supply that sweet PCB kit includes.


Any Ideas?

__________________
((AE))
  Reply With Quote
Old 21st August 2008, 07:05 PM   #10
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Contact Jack directly about what is/isn't included, though I'm sure the transformer wasn't part of the deal.

The primary and secondary resistances are easily measured with a multimeter. But again, if you start measuring voltages, there are definite safety hazards for a noobie. We don't want to lose you! Check the Safety and High Voltage Practices sticky thread. And I would HIGHLY recommend you invest in Morgan Jones's two books on tubes and tube amps. That will help keep you safe and give you a lot more understanding of what you're doing.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
A 6SN7 direct coupled preamp & regulated supply for everyone's perusal. G Tubes / Valves 23 21st August 2012 11:57 AM
preamp supply w/ 48v power impsick Power Supplies 16 27th April 2007 11:36 PM
Need Help for Power Supply for gg Preamp vangogh-hk Tubes / Valves 7 8th December 2005 02:00 PM
P88 preamp power supply Scribble Solid State 2 23rd January 2005 08:50 AM
Boz Preamp Power Supply beppe Pass Labs 0 5th March 2002 08:11 PM


New To Site? Need Help?

All times are GMT. The time now is 04:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2