phonostage with 150VDC B+ - 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 17th August 2007, 03:47 AM   #1
alexg is offline alexg  Philippines
diyAudio Member
 
alexg's Avatar
 
Join Date: Jan 2005
Location: Philippines
Default phonostage with 150VDC B+

Am looking for a tube phonostage with 150V B+. Can somebody give me schematic or point me to one?

(I have a 130-0-130 ptx )

Thanks.
  Reply With Quote
Old 17th August 2007, 07:24 AM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
GE, who 1st developed mag. carts., devised a circuit around the 6SC7. I've attached a schematic of a Fisher unit that followed GE's lead.

A number of changes are necessary to use modern mag. carts. The I/P resistor has to be 47 KOhms and the HF roll off is achieved by placing a cap. across the O/P.

I'm working with a fellow who has a pair of the Fisher mono units. Perhaps he will be willing to provide a scan of the regulated PSU that was devised, with help from the "crowd" here.

BTW, that cicuitry will work with a 'SL7 or a 5751. Don't forget a DC heater supply.
Attached Images
File Type: gif fisher pr-6 schematic.gif (38.5 KB, 347 views)
__________________
Eli D.
  Reply With Quote
Old 17th August 2007, 07:37 AM   #3
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
Hi Eli, that looks nice and simple. Does your friend like the sound?
  Reply With Quote
Old 17th August 2007, 08:26 AM   #4
diyAudio Member
 
Join Date: May 2007
Default Re: phonostage with 150VDC B+

Quote:
Originally posted by alexg

(I have a 130-0-130 ptx )

Thanks.
With this PT you can also get 300V B+
  Reply With Quote
Old 17th August 2007, 01:41 PM   #5
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Quote:
Originally posted by arnoldc
Hi Eli, that looks nice and simple. Does your friend like the sound?

Arnold,

The project is not complete. So, no comments are available. FWIW, Avery Fisher's ears were quite decent.

A couple of threads regarding the matter can be found on AA. Search against the Tube and Tube DIY forums.



Edit: fixed typo
__________________
Eli D.
  Reply With Quote
Old 17th August 2007, 01:57 PM   #6
alexg is offline alexg  Philippines
diyAudio Member
 
alexg's Avatar
 
Join Date: Jan 2005
Location: Philippines
Default Re: Re: phonostage with 150VDC B+

Quote:
Originally posted by revintage


With this PT you can also get 300V B+
How do I do that? Voltage doubler?

Thanks.
  Reply With Quote
Old 17th August 2007, 02:01 PM   #7
diyAudio Member
 
Join Date: May 2007
Just neglect the CT and use a bridge-rectifier. If you want to use a tube rectifier you can make the bridge from the tube together with two silicon diodes.
  Reply With Quote
Old 17th August 2007, 02:46 PM   #8
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
i.e. graetz bridge
  Reply With Quote
Old 17th August 2007, 02:51 PM   #9
diyAudio Member
 
Join Date: May 2007
Yep
  Reply With Quote
Old 18th August 2007, 01:13 AM   #10
alexg is offline alexg  Philippines
diyAudio Member
 
alexg's Avatar
 
Join Date: Jan 2005
Location: Philippines
Thanks for the input.

I think I can adopt my ptx for Thorsten designed circuit (12ax7/6dj8) phonostage.

BTW, how do you compute for the voltages using the hybrid rectifier (two diodes and a tube rectifier). do multiply the voltages from the diodes with 1.41 and use that to simulate using PSUD2?

Thanks.
  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
freaky new phonostage Vinylsavor Tubes / Valves 35 30th November 2010 07:30 AM
rjm 2 tube phonostage hacknet Analogue Source 6 10th April 2006 05:27 AM
Nice meters FS 150VDC jlsem Swap Meet 5 20th May 2005 02:08 PM
Mallroy 2000F/ 150Vdc WALTER BURKHARD Swap Meet 0 31st January 2004 09:58 PM
diy MC-phonostage Onvinyl Analogue Source 25 30th November 2002 04:24 PM


New To Site? Need Help?

All times are GMT. The time now is 10:12 PM.


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