WHY Peavey? Why?!?!

[Anonymous]

Had a 5150II on my bench today. It had a few blown screen grid resistors. Someone did a "quickie" repair to it once before, but it failed. The resistor was shorting to the loop board directly above it...

The pain in the butt about these is that the power tube board is riveted to the chassis. You have no choice but to drill out the rivets...

Anyway, it is all done and sounds pretty decent. Reminds me of a Soldano Hot Rod+

Some pics:

Before:

After:

Rebiased and tested...

 

[tonechasers]

why fusionbear why do you have to live so far from me, since my old man died i've got broken amps stacking up.... I really should learn... but i'd wrather play.

 

[glpg80]

i guess you swapped the resistor out to allow for proper bias as well? wierd they are riveting the boards now, the one i own is not riveted at all - other ones i have came across arent either. seems as though i must be lucky as i have heard more than once they are riveted.

BTW what diameter solder is that?! .015mm? what rosin core are you using with it?

i also see peavey is taking other corners as well - the ballast resistors parallel to the filter caps used to be mil-spec 1% tolerance, looks like average joe 5-10% in there now. that + the rivets must mean they are hurting bad in this economy

 

[Giga]

Well, my 25 y/o VTM's were also rivetted, so nothing new here

I *think* it's because it's a bit of a pain to get access to either the bolthead or the nut once the board is in place.

Giga

 

[JerryP]

Peavey has always done that. At some point the 5150II changed to a newer style board which mounted with screws. Different board layout and different tube sockets. The 5150 eventually got the new board just before the change to the 6505 name. They all are held in with screws now.
The screen grid resistors can be changed without pulling the board on the old style board.
Jerry

 

[Anonymous]

Peavey has always done that. At some point the 5150II changed to a newer style board which mounted with screws. Different board layout and different tube sockets. The 5150 eventually got the new board just before the change to the 6505 name. They all are held in with screws now.
The screen grid resistors can be changed without pulling the board on the old style board.
Jerry

Thanks for the heads up!

 

[Anonymous]

I have changed the screen resistors on a few 5150's. I always go up to 1k/5 watts.

I thought about that, but that can make the amp feel a tad spongy to guys who play the drop tuned stuff. In the end, I went with the standard 470 Ohm 5 watt Fender/MESA vs. the ridiculous 100 Ohm 5 watt original ratings.