Peavey Classic 30

Ard · 02-27-2009, 12:36 PM

I own a Classic 30 for several years and sometimes wondered if it wouldn't be time to change out the tubes, after reading about that, but never did that - yet. Being very happy with the great sound from the amp I thought just leave it as it is. While rehearsing yesterday I suddenly heard a loud squeal which left me with no sound at all.
Changing from guitar Input to Effects return didn't change a thing. The power tube at the far left doesn't glow, so could this indicate a tube failure of that particular one? Thnx for your advice!

bnwitt · 02-27-2009, 02:43 PM

Of course. Re-tube your amp now. The bad thing about pushing power tubes beyond their rated hours, is they can short and take out other components.

tubeswell · 02-27-2009, 07:45 PM

Yep those EL84s need retubing about every 12 months (if you play it every day). Put a new quad in.

Ard · 02-27-2009, 09:48 PM

OK guys, thanks for the quick reply.

I've ordered 4 JJ's and will let you know the results.

CharlieP · 03-02-2009, 04:15 AM

You may also have a bad fuse. Bad power tubes can blow fuses.

Ard · 03-06-2009, 03:38 PM

Quote:

Originally Posted by CharlieP

You may also have a bad fuse. Bad power tubes can blow fuses.

After finally receiving the new tubes and installing them late in the evening yesterday I soon found out to still have no sound. But alll tubes glow now so tonight I will dig into it again and check the fuses as you suggest.

drewl · 03-06-2009, 03:50 PM

They really run these too hot.
I always install a bias pot and set the bias where it should be when I fix these, just did one last week.
Anyway, check the screen grid resistors on pin 9 of the output tubes. When they go they often fry these resistors causing the tubes to light up but not amplify.

Ard · 03-06-2009, 06:52 PM

Final update

There also was a fuse blown indeed, also replaced it and again enjoy the great sound of my Classic 30.

Thanks for the help you've been giving!

CharlieP · 03-06-2009, 11:09 PM

Rock On! Glad you have it fixed.

02-27-2009, 12:36 PM	#1
Ard Junior Member Join Date: Feb 2009 Location: The Netherlands Posts: 6	Peavey Classic 30 - Tube failure? I own a Classic 30 for several years and sometimes wondered if it wouldn't be time to change out the tubes, after reading about that, but never did that - yet. Being very happy with the great sound from the amp I thought just leave it as it is. While rehearsing yesterday I suddenly heard a loud squeal which left me with no sound at all. Changing from guitar Input to Effects return didn't change a thing. The power tube at the far left doesn't glow, so could this indicate a tube failure of that particular one? Thnx for your advice!

02-27-2009, 07:45 PM	#3
tubeswell Supporting Member Join Date: Feb 2007 Location: Wellington NZ Posts: 2,658	Yep those EL84s need retubing about every 12 months (if you play it every day). Put a new quad in. __________________ Building a better world (one tube amp at a time)

03-02-2009, 04:15 AM	#5
CharlieP Member Join Date: Jan 2009 Location: L. Panasoffkee, FL Posts: 86	You may also have a bad fuse. Bad power tubes can blow fuses. __________________ CharlieP Peavey VK 112 2008 Marshall 250 DFX 2007 Met. Red LP Gibson Robot 2008 Faded Cherry LP Gibson 2007 Fender Strat HSS LSR S1 2008 Pearl Gretsch G5120 2007 Black

03-06-2009, 11:09 PM	#9
CharlieP Member Join Date: Jan 2009 Location: L. Panasoffkee, FL Posts: 86	Rock On! Glad you have it fixed. __________________ CharlieP Peavey VK 112 2008 Marshall 250 DFX 2007 Met. Red LP Gibson Robot 2008 Faded Cherry LP Gibson 2007 Fender Strat HSS LSR S1 2008 Pearl Gretsch G5120 2007 Black

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02-27-2009, 02:43 PM	#2
bnwitt Senior Member Join Date: Nov 2008 Location: Southern California Posts: 409	Of course. Re-tube your amp now. The bad thing about pushing power tubes beyond their rated hours, is they can short and take out other components.

02-27-2009, 09:48 PM	#4
Ard Junior Member Join Date: Feb 2009 Location: The Netherlands Posts: 6	OK guys, thanks for the quick reply. I've ordered 4 JJ's and will let you know the results.

03-06-2009, 03:50 PM	#7
drewl Senior Member Join Date: Jun 2006 Posts: 556	They really run these too hot. I always install a bias pot and set the bias where it should be when I fix these, just did one last week. Anyway, check the screen grid resistors on pin 9 of the output tubes. When they go they often fry these resistors causing the tubes to light up but not amplify.

03-06-2009, 06:52 PM	#8
Ard Junior Member Join Date: Feb 2009 Location: The Netherlands Posts: 6	Final update There also was a fuse blown indeed, also replaced it and again enjoy the great sound of my Classic 30. Thanks for the help you've been giving!

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