Strange 5F1 champ problem

pjf626 · October 31st, 2009, 09:39 PM

I have a Valvetrain 59 champ clone. When the volume is full up you get a very low weak feedback sound whether a guitar is plugged in or not. If you tap the side of the amp it will stop temporarily if you tap it again it will start again. I do not hear it at lower volumes like 5 or 6. I did change out the 6v6 tube, sound is still there. Anybody have any ideas what might be causing this?

Thanks

JohnnyCrash · October 31st, 2009, 10:02 PM

Perhaps a microphonic preamp tube?

Try swapping out the 12AX7 preamp tube.

Groovey Records · October 31st, 2009, 10:16 PM

Thats gota be the culpret the tubes going but I kinda k=like them right on the edge

pjf626 · October 31st, 2009, 10:30 PM

Thanks Johnny that was indeed the culprit.

October 31st, 2009, 09:39 PM	#1 (permalink)
pjf626 TDPRI Member Join Date: Nov 2004 Location: Schaumburg, IL Posts: 34	Strange 5F1 champ problem I have a Valvetrain 59 champ clone. When the volume is full up you get a very low weak feedback sound whether a guitar is plugged in or not. If you tap the side of the amp it will stop temporarily if you tap it again it will start again. I do not hear it at lower volumes like 5 or 6. I did change out the 6v6 tube, sound is still there. Anybody have any ideas what might be causing this? Thanks

October 31st, 2009, 10:02 PM	#2 (permalink)
JohnnyCrash Poster Extraordinaire Join Date: Mar 2005 Location: Fullerton, CA Posts: 8,748	Perhaps a microphonic preamp tube? Try swapping out the 12AX7 preamp tube. __________________ -- I constantly have to remind myself I'm a grownup and it's just the internet.

October 31st, 2009, 10:16 PM	#3 (permalink)
Groovey Records Tele-Afflicted Join Date: Apr 2008 Location: Desolation Row Posts: 1,521	Thats gota be the culpret the tubes going but I kinda k=like them right on the edge __________________ Yeah but you should of heard what I was trying to play-Thelonius Monk EnJoY ThE MuSiC GrooVey RecOrds

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October 31st, 2009, 10:30 PM	#4 (permalink)
pjf626 TDPRI Member Join Date: Nov 2004 Location: Schaumburg, IL Posts: 34	Thanks Johnny that was indeed the culprit.

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