I have this 1970 V4 on my bench that likes to eat power tubes.
It has been mostly recapped there is one original can cap left.
It has been through three quads in the past three years. The tubes seem to short before they have much time on them.
there are no fly back diodes on the ot -would adding them help?
The board has a spot under the 470 ohm resistor feeding the screens that has seen some significant heat, not burnt but crispy.
The circuit looks to be pretty much stock other than the caps that have been replaced.
So what are the best (most durable) 6L6's. JJ's and winged C's didn't survive....
Should I go with the Sovtek 5881's? I know the owner is tired of buying new tubes after a couple of gigs....
Thanks,
Marc
It has been mostly recapped there is one original can cap left.
It has been through three quads in the past three years. The tubes seem to short before they have much time on them.
there are no fly back diodes on the ot -would adding them help?
The board has a spot under the 470 ohm resistor feeding the screens that has seen some significant heat, not burnt but crispy.
The circuit looks to be pretty much stock other than the caps that have been replaced.
So what are the best (most durable) 6L6's. JJ's and winged C's didn't survive....
Should I go with the Sovtek 5881's? I know the owner is tired of buying new tubes after a couple of gigs....
Thanks,
Marc
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