preamplifier usher p 307a - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 February 2013, 04:15 PM   #1
diyAudio Member
 
Join Date: Oct 2009
Default preamplifier usher p 307a

Hi I have a preamp would usher p 307th and adjust the voltages Someone will have the service manual or reference of all voltages.gracias
  Reply With Quote
Old 30th September 2014, 12:47 PM   #2
jlithen is offline jlithen  Finland
diyAudio Member
 
Join Date: Nov 2009
Location: Vaasa
Maybe a bit late reply, but they seem to be +/-20V and +/-12V.
The voltages are just regulated in two stages of LM317 and 337 I think.

I just bought one and have built a custom PSU for it and I will do a recap.
Original caps are absolute crap.

Maybe replacing the regulators might be beneficial too
  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
Wanted: 306A; offer two NOS 307A iko Swap Meet 2 30th January 2013 09:05 PM
PREAMPLIFIER USHER P307 A miguelnoda Solid State 0 3rd July 2012 11:16 PM
Where are the 307A / VT225 amps? corbato Tubes / Valves 63 22nd February 2012 11:11 AM
1pr Sylvania 307A / VT-225 Tubes (NOS in original boxes) n_maher Swap Meet 4 15th February 2011 12:05 AM
FS: [2] pairs of 307A / VT225 tubes n_maher Swap Meet 3 8th July 2010 12:47 PM


New To Site? Need Help?

All times are GMT. The time now is 03:31 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