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63 Concert blows one power tube

jackmac

Member
Messages
6
I've got a 63 Fender Concert that blew one of the power tubes after only a couple hours of use. Had a tech replace the tube socket, the resisters at the socket, and new power tubes. After a couple hours, same thing, started to sound really hot (good!) and saw that the tube was glowing badly and shut it down. BTW, the amp had been in an attic for about 30 years. Any help would be greatly appreciated!
 

Baloney

Senior Member
Messages
1,675
It could be your Capacitor hoses or your Speaker bearings.

HAHA seriously man take it in to a tech for a check up. 30 yrs is a long time.
 

Structo

Member
Messages
9,556
So the tech didn't replace any of the electrolytic caps?

Not a very good tech if he at least didn't tell you that they should be replaced.

When you have it recapped (filter caps, bias cap and bypass caps) , have them also install a three prong cord, remove the death cap and take the ground switch out of circuit.
Don't let them replace any of the coupling caps unless they are super leaky and cause the pots to be scratchy.
 

donnyjaguar

Member
Messages
4,199
Satellite has the most probably cause. Check also the resistor supplying the bias voltage to the Cgrid. It could be going open circuit as the amp warms up. This is a typical failure mode.
 

jackmac

Member
Messages
6
The tech "replaced all filter capacitors and cathode bypass capacitor, installed adjustable bias pot, replaced other components as needed, cleaned controls, retubed and adjusted bias for new tubes". I moved shortly after having the work done, and now look to getting it running.
I know I need to get it to a qualified tech. Thanks for all of the advise,
John
 

Trout

Member
Messages
7,551
The tech "replaced all filter capacitors and cathode bypass capacitor, installed adjustable bias pot, replaced other components as needed, cleaned controls, retubed and adjusted bias for new tubes". I moved shortly after having the work done, and now look to getting it running.
I know I need to get it to a qualified tech. Thanks for all of the advise,
John

Sounds like a leaky coupling cap,
 

kidmandude

Platinum Supporting Member
Messages
3,018
so the tech didn't replace any of the electrolytic caps?

Not a very good tech if he at least didn't tell you that they should be replaced.

When you have it recapped (filter caps, bias cap and bypass caps) , have them also install a three prong cord, remove the death cap and take the ground switch out of circuit.
Don't let them replace any of the coupling caps unless they are super leaky and cause the pots to be scratchy.
+++1
 




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