Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 31st January 2013, 10:11 AM   #1
diyAudio Member
 
Join Date: Jan 2013
Default Humming V1 in Fender Pro Junior

Hi all,

I wonder if anyone might have experienced something similar to this...

I want to reduce the gain in the pre-amp of my Fender PJ, so I have tried a number of different tubes in the V1 but they ALL create a tremendous electrical buzz.

Please note the stock Sovtek 12AX7 does NOT hum or buzz in the V1 position, but I want to be able to adjust it and I thought I should be able to experiment without the buzz. I have tried a JAN GE 5751, EH 12AY7 but the sovtek is the only one that works properly. I wonder, is this related to tubes or related to the electrics?

Many thanks!

Tom
  Reply With Quote
Old 1st February 2013, 06:45 AM   #2
Tesla88 is offline Tesla88  Italy
diyAudio Member
 
Tesla88's Avatar
 
Join Date: Dec 2011
Location: Italy
The schematic is quite simple and i don't see why changing V1 with a pin to pin compatible valve (same heater also) would lead to a buzzing amp , anyway can you better describe the buzzing sound?

Maybe is only due to bad pin contact or bad tubes . . .

http://support.fender.com/schematics...atic_Rev-F.pdf
  Reply With Quote
Old 1st February 2013, 06:48 AM   #3
Tesla88 is offline Tesla88  Italy
diyAudio Member
 
Tesla88's Avatar
 
Join Date: Dec 2011
Location: Italy
Why start open topics with same issue?

Fender Pro Junior Tube Set Up...
  Reply With Quote
Old 1st February 2013, 07:10 AM   #4
diyAudio Member
 
Join Date: Jan 2013
No reason other than the desire to attract people more knowledgeable than myself to contribute and ultimately expand my tragically under-informed mind.
  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
Fender Pro Junior Tube Set Up... tomincognito Instruments and Amps 1 28th January 2013 04:57 PM
Fender TR SF. Humming like crazy only with the outer tubes in place. Dick Deviant Instruments and Amps 13 12th April 2012 07:47 AM
Strange problem with a Fender Blues Junior Cassiel Instruments and Amps 8 15th February 2012 02:51 PM
Fender tweed pro-amp clone cheltok Tubes / Valves 3 23rd May 2010 08:43 PM
Fender Pro Amp atmars Tubes / Valves 1 23rd November 2008 01:30 AM


New To Site? Need Help?

All times are GMT. The time now is 06:04 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