Comments on: Fender Hot Rod Deluxe Amp Repair Video Part 2

By: Gary

Gary — Sat, 31 Jul 2010 23:23:15 +0000

Hi,

Fantastic…good eyeballing there!

Gary

By: billy ray

billy ray — Sat, 31 Jul 2010 22:38:38 +0000

Thank you for all your information.
Turns out one of the solder connections on the ribbon cable to the preamp tubes had a loose connection on the curcuit board. The ground wire was also loose on the circuit board.
I removed the board and re soldered the 2 connections. I put it back together and it sounds great and every thing seems to work. Thanks again and have a great day, I know I will be rocking.

By: Gary

Gary — Sat, 31 Jul 2010 14:23:19 +0000

Hi,

So you’re saying you switched one GLG for the other?

If you did, the amp shouldn’t quit working, even if one was noisy. Are you sure the bottom part (plastic) guide tip (inside the metal pins circle) is not broke off? You would be able to see the glass of the tube from the bottom if it was.

And besides, tubes going bad ( unless they cause a short from the above problem or a tube destructs internally) is not going to make your amp dead.

I would put it back the way it was and see if it comes on. I’m not saying it’s not your tubes but at the same time I can’t say it is the tubes. There’s nothing worse than buying 2 6L6′s and still have a problem. No one is going to take tubes back.

Gary

By: billy ray

billy ray — Sat, 31 Jul 2010 02:18:44 +0000

no switched 1 output tube for the other. same tubes different plugs. Is that bad?

By: Gary

Gary — Sat, 31 Jul 2010 02:09:05 +0000

Hi,

I’m assuming you switched the output tubes with tubes that are not from this amp? It shouldn’t be dead. Something doesn’t sound right.

It’s really hard to troubleshoot on the net, from what you said so far, I would take it to a shop or to a friend that works on amps. You could buy tubes and still have the problem.

Just my 2 cents.
Gary

By: billy ray

billy ray — Sat, 31 Jul 2010 01:50:43 +0000

switched the 2 tubes now it is dead, so i think re tube it all. Is there matched 6L6 and the other 2 in a pair then 1 single?
I will start with only 2 6L6 and see.
Unless you have a better thought.

By: Gary

Gary — Sat, 31 Jul 2010 01:13:54 +0000

Hi,

It may be a tube, if you have a known good tube to replace each one and see if the noise goes away would be the quick thing to do.

Gary

By: billy ray

billy ray — Fri, 30 Jul 2010 21:33:34 +0000

I have a 2002 hot rod deluxe. If you tap about any where on the amp it crackles. I opened the back and when i tap around the curcit board, knobs, or compontents it crackles. It seems worse when i tap on the GT6L6B tubes. and one tube worse than other. Would bad tubes cause it to crackle even when i tap on the outside case?

By: Gary

Gary — Sat, 24 Jul 2010 19:26:44 +0000

Hi,

On the power resistors, possibly, depends on which ones. If it’s the step down FP, those generate some heat which could be that the legs have pulled away from the board or a component near them. Continuity test would tell.

If it’s the resistors leading to the 15 volts feed, now that may be your problem…did you check the voltages 15 v rails? May have lost a zener or an Ic.

There’s a schematic at http://www.fender.com/support/amplifier_schematics.php if you don’t have one.

Gary

By: Kyle

Kyle — Sat, 24 Jul 2010 16:50:11 +0000

Unfortunately, all the caps (& diodes) look to be in great shape. It looks like one of the power resistors has gotten hot at some point, perhaps I’ll try flipping it for a new one.

Thanks so much for your thoughts!