Help - 63 Brown Deluxe gone bad

[Kbro]

Hi, My amp just started cracking up the other night. I just put a differant set of tubes in and it's the same thing. I have made a short mp3 of the sound and was hoping someone might give it a listen and recognize the problem. btw, it only cracks up with an input signal. It's like a really ugly distortion - not at all musical.
I'm not quite sure how to post the mp3 so I will try here, in the post section, and if that does not work please email me and I will send it out.

Thanks for any help.
Ken

Edit - the following should take you yo the post.....

hi-fi URL: http://www.soundclick.com/util/getplayer.m3u?id=7471932&q=hi

[scottlaned]

When were the caps last replaced?

[Kbro]

It was in for service a couple of years ago and a couple of filter caps were replaced.

[Kbro]

Is there anyone out there who might be able to help me with this problem?

Thx

[WaltC]

troubleshooting guitar amps thoroughly is a fairly involved even if not a particularly esoteric engineering task.

explaining how to do it to someone who doesn't know how already can take hours, and without pictures is almost always doomed to failure.

Start w/ these resources and then let us know what you find out and ask any specific questions you get and we can see if we can help. Pictures are ***very*** helpful...

http://www.pacificrecone.com/JackDarrBook.html

http://acruhl.freeshell.org/mga/main/troubleshoot.html

http://www.aikenamps.com/ (lots of great info here)

or go here :
http://www.el34world.com/schematics.htm#Links%20to%20technical%20and%20amp% 20service%20information.

and scroll down to "Servicing Fender Amps"

[slider313]

It was in for service a couple of years ago and a couple of filter caps were replaced.

I've seen some techs replace only a "couple" electrolytic caps and wonder why they don't replace all of them. Yes, they may test good in the circuit but for how long? Life span on these is somewhere between 15 and 20 years, depending on use. Be sure all your electrolytics are new.

[FloridaSam]

I've seen some techs replace only a "couple" electrolytic caps and wonder why they don't replace all of them. Yes, they may test good in the circuit but for how long? Life span on these is somewhere between 15 and 20 years, depending on use. Be sure all your electrolytics are new.


Exactly. Like only replacing 3 tires on a car if one still looks ok. I'd bet a bad cap.

[Kbro]

I was hoping someone might recognize the sound in the clip I posted as it is quite unique. ie. a bad load resistor\op tranny\rectifier tube causes an output such as the one in the post.

.....thanks for the leads to the web sites Walt

[schmidlin]

Sure sounds like a blown speaker to me. Did you try another?

IME, bad filter caps throw in 60hz, not Moog.
From your description, something is loose (even a loose speaker coil connection) and I would open it up and do the ol' chopstick test.