tube problem?

Crimes · Post by **Crimes** » Sun Jan 01, 2006 11:00 pm

A ringing sound recently started coming out of the back of my ad30tc when i play at loud volumes. It's also become near impossible to avoid feedback at loud volumes. When I palm mute, the feedback is almost louder than what i'm playing. Is this a tube related issue? Thanks

acorkos · Post by **acorkos** » Sun Jan 01, 2006 11:12 pm

prolly a microphonic preamp tube. gotta good spare? swap it into each spot until you find the bad one. or sometimes tapping on each one whilt the amp is on reveals the bad guy.

VintageJon · Post by **VintageJon** » Mon Jan 02, 2006 3:39 am

Well, it could be microphonic tube or Korean pick-up as these pick-ups are known to feedback like crazy, especially with heavy distortion.

-Jon

Crimes · Post by **Crimes** » Mon Jan 02, 2006 10:13 pm

I'm thinking it sounds more like a tube problem. So which tubes are the preamp tubes? (stupid question)

MarcusBlacksmith · Post by **MarcusBlacksmith** » Mon Jan 02, 2006 10:36 pm

Check out the photo in this thread:

http://forum.orangeamps.com/viewtopic.php?t=6486

The main pre-amp tubes are Clean, Dirty #1, Dirty #2 and Phase Inverter.

Now if someone would just enlighten this silly bastard as to removing the chassis from the sleeve, I could get on with checking my OWN tubes.

Crimes · Post by **Crimes** » Tue Jan 03, 2006 3:19 am

OK! I did the pencil tap test and I found the problem tube. It's the GZ34. Two more questions, what kind of tube is this (preamp, power), and can I replace it with an Electro Harmonix tube? Thanks so much guys.

Crimes · Post by **Crimes** » Tue Jan 03, 2006 3:57 am

Nevermind!! I figured it all out. All fixed. Thanks again.

tube problem?

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