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 7th June 2008, 03:00 AM   #1
diyAudio Member
 
Join Date: May 2008
Default My 66 Fender bassman tube guitar amp is cutting out intermittently and is making a bl

My 66 Fender bassman tube guitar amp is cutting out intermittently and is making a blip blip blip noise after notes are struck?? Has anyone ever had a similar problem? If so any guidance would be greatly appreciated.


Thanks guys

Eric
  Reply With Quote
Old 7th June 2008, 02:52 PM   #2
diyAudio Member
 
Join Date: Oct 2007
blip blip blip sounds like some sort of power supply problem, it's trying to "motorboat". I would bet that the problem is elsewhere and some other portion of the amp is drawing too much current. Look for a bad coupling cap first. It seems like I've had a resistor in the power supply cause that problem before too but it also was caused by some other problem which caused it to see too much current.
  Reply With Quote
Old 7th June 2008, 03:15 PM   #3
diyAudio Member
 
Join Date: May 2008
I read somewhere that if a cap has a resistance over 350k that it is leaky is there any truth to this? And if not is there any bulletproof way to test for leakage. BTW I've also heard that if you put AC or DC current through I can't remember what kind or even how much if there is current going through the cap it is leaky. Any help getting to the bottom of this would be appreciated.

Thanks
Eric
  Reply With Quote
Old 7th June 2008, 04:06 PM   #4
diyAudio Member
 
Join Date: Jun 2008
Solder joint, bad connection. Take a chopstick and poke around the board and wires.
  Reply With Quote
Old 7th June 2008, 04:23 PM   #5
diyAudio Member
 
Join Date: Jun 2008
If you want to test for a leaky coupling cap. Put your meter to DC and measure after the coupling cap. There should be very little DC voltage.
  Reply With Quote
Old 7th June 2008, 08:06 PM   #6
diyAudio Member
 
Join Date: May 2008
Thank you audiotuber!
  Reply With Quote
Old 8th June 2008, 04:21 PM   #7
diyAudio Member
 
Join Date: May 2008
Found it BAD PHASE INVERTER TUBE!!

thanks guys


eric
  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 Bassman Ten Benny Bennett Instruments and Amps 2 2nd April 2009 01:01 PM
antique fender bassman 50 retubed HELP firefart_1st Tubes / Valves 1 26th May 2008 11:06 PM
Fender Bassman- AB165 capacitor toss up Willampsburn Tubes / Valves 1 9th February 2008 02:12 AM
Fender Bassman PT Rewind OKBill Tubes / Valves 4 14th January 2007 02:51 PM
Modifing A Fender Bassman Scheme amirmk Tubes / Valves 5 16th September 2005 07:34 PM


New To Site? Need Help?

All times are GMT. The time now is 06:50 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