No output and Loud squeals! Help!

skid20 · 2nd May 2010, 02:48 AM

new tubes

new output transformer

new filter caps

I plug in my guitar and I get no output from the guitar but get a loud buzzing and squealing....

what else should I be looking for?

rotaspec · 2nd May 2010, 03:28 AM

A schematic would help here.
If the amp uses negative feedback, try hooking it up to the opposite end of the speaker winding (or if the speaker winding has a ground you will have to swap that too or reverse the connections of the primary winding - all of them if it uses screen taps)

skid20 · 2nd May 2010, 03:29 AM

..Gee.... I guess it helps to have the OT grounded huh? Nevermind noob mistake

rotaspec · 2nd May 2010, 03:41 AM

Only on the secondary side. Grounding any part of the primary will toast the OT.

skid20 · 2nd May 2010, 03:52 AM

Quote:

Originally Posted by rotaspec

Only on the secondary side. Grounding any part of the primary will toast the OT.

Agreed

When I clipped the "remote" leads from the terminal strip on the back of the chassis I apparently cut the ground that went to the ground terminal for the OT!

The worst part about it is I've been trying to figure it out for 2 days!

rotaspec · 2nd May 2010, 04:07 AM

Glad you got it sorted in the end

2nd May 2010, 02:48 AM	#1
skid20 diyAudio Member Join Date: Mar 2010	No output and Loud squeals! Help! new tubes new output transformer new filter caps I plug in my guitar and I get no output from the guitar but get a loud buzzing and squealing.... what else should I be looking for?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
cracked el34 -> replacement squeals	PM650	Tubes / Valves	1	19th May 2008 02:47 PM
How loud can you go?	paulspencer	Multi-Way	7	28th June 2007 04:12 AM
DIY tube amp squeals when turned up	jjai	Tubes / Valves	4	7th September 2005 01:32 AM
Occasional loud popping from spkrs (tube output stage on DAC)	HeadSh0T	Digital Source	4	13th May 2003 01:57 AM
how loud do i need to go	badger	Multi-Way	6	8th January 2002 07:24 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

2nd May 2010, 03:28 AM	#2
rotaspec diyAudio Member Join Date: Nov 2007	A schematic would help here. If the amp uses negative feedback, try hooking it up to the opposite end of the speaker winding (or if the speaker winding has a ground you will have to swap that too or reverse the connections of the primary winding - all of them if it uses screen taps)

2nd May 2010, 03:29 AM	#3
skid20 diyAudio Member Join Date: Mar 2010	..Gee.... I guess it helps to have the OT grounded huh? Nevermind noob mistake

2nd May 2010, 03:41 AM	#4
rotaspec diyAudio Member Join Date: Nov 2007	Only on the secondary side. Grounding any part of the primary will toast the OT.

2nd May 2010, 04:07 AM	#6
rotaspec diyAudio Member Join Date: Nov 2007	Glad you got it sorted in the end

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)