Blues Junior keeps blowing F1 Fuse - Telecaster Guitar Forum
The Number 1 Fender Telecaster Guitar authority in the world.
   

Go Back   Telecaster Guitar Forum > Amplifier Discussion Forums > Amp Central Station
Forgot Username/Password? Join Us!
Notices

Amp Central Station Amps, tubes, speakers & everything AMP related.


Wilde Pickups by Bill & Becky Lawrence WD Music Products Amplified Parts Mod Kits DIY Amps, Mods, Pedals dallenpickups.com Warmoth.com seymourduncan.com


Forum Jump


Reply
 
Thread Tools
Old October 18th, 2009, 11:20 AM   #1 (permalink)
Tele-Meister
 
Join Date: Nov 2004
Location: Southern Minnesota
Age: 49
Posts: 350
Blues Junior keeps blowing F1 Fuse

When I turn my Blues Junior on it hums for about two seconds than blows the F1 fuse. Any suggestions as to where to start with troubleshooting? It does have the BillM presence control and a Celestion 30, but is otherwise stock. Any advise would be appreciated.

DougF is offline   Reply With Quote

Old October 18th, 2009, 11:43 AM   #2 (permalink)
Tele-Afflicted
 
Al Watsky's Avatar
 
Join Date: Apr 2007
Location: New Jersey
Age: 62
Posts: 1,575
Power tubes would be my first try. Install a new set and hit the on switch and see what happens.
__________________
Livin' in the Past ,Present and Future
is takin' up all my time..........
Al Watsky is offline   Reply With Quote

Old October 18th, 2009, 09:21 PM   #3 (permalink)
Tele-Holic
 
tele_jas's Avatar
 
Join Date: Feb 2006
Location: Springfield/Mt.Vernon, MO
Age: 42
Posts: 998
If not a power tube, probably a Rectifier... If none of those, you'd probably need to take it to an amp tech.

I kept blowing fuses in my Dr Z when my Rectifier tube was going out.
__________________
Dr. Z Z-Wreck * 65amps London Pro * Tele's * Bunch 'O Pedals...
Good deals with: tweeddeluxe, Lwilliams, Sunkidd
www.southerngreenband.com www.facebook.com/SGreenBand www.guitartest.moonfruit.com
tele_jas is offline   Reply With Quote

Sponsored Links   #
Sponsored posting
 

Old October 18th, 2009, 09:57 PM   #4 (permalink)
Friend of Leo's
 
Join Date: Mar 2008
Location: New Jersey
Age: 67
Posts: 2,211
The rectifier is solid state. I have yet to see a Blues Junior blow a diode, but anything is possible. I'd suspect output tubes, too. It's fairly common for EL84 screen grids to fail and short out to some other part of the tube.

There have also been problems with leaky filter caps. One could short out internally, which would blow the fuse right quick:



More info about this on my site:

http://billmaudio.com/wp/?page_id=267
Billm is offline   Reply With Quote

Old October 24th, 2009, 06:51 PM   #5 (permalink)
Tele-Meister
 
Join Date: Nov 2004
Location: Southern Minnesota
Age: 49
Posts: 350
Bill, you nailed it on the head. I noticed one of my Mullards had a black spot on the glass and when I swapped it out the amp worked fine. Does it hurt to have two different makes of output tubes? I noticed the other Mullard has a blue ring on the top its grid while the new Electro Harmonics looks fine.
DougF is offline   Reply With Quote

Old October 25th, 2009, 09:07 PM   #6 (permalink)
Friend of Leo's
 
Join Date: Mar 2008
Location: New Jersey
Age: 67
Posts: 2,211
Your output tubes should be a matched pair for best performance. When the tubes have different current draw and thus run at different levels of amplification, their ability to cancel out common mode hum is diminished. They also produce more harmonic distortion.

Fender recommends that the output tubes be within 20 percent of one another.
Billm is offline   Reply With Quote

Reply

Bookmarks

Thread Tools

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

Forum Jump


» Random Photo for Guests
'62/63 Mark Jenny/Jim Sliff/Kirk Fletcher Special
Untitled Document



 


Powered by vBadvanced CMPS v3.2.2



IMPORTANT:Treat everyone here with respect, no matter how difficult! No sex, drug, political, religion or hate discussion permitted here.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 RC 2
© TDPRI.COM 1999 - 2014 All rights reserved.