I've only had a couple of tube rectified amps,most were old designs, like the old 1961 Bell.
What I have been using for the last year of trouble free listening is a DecWare Zen Select.
I came across a collection of old 5U4GB rectifier tubes from RCA and Sylvania to name a few.
I never thought a rectifier tube change from the stock one would make that great a difference, but it did.
Now here is the nice part,they measured 60 on a tube tester,so they were still good.
The even better news is that in the DecWare amp, they should last longer than I will.
I suppose it depends on the amplifier design,but I think the Op's rectifier tubes may not have been all they were cracked up to be.
I don't think rectifier tubes are as prone to wearing out as fasat or faster than the output tubes, at least not in any amps that I am familiar with.
Perhaps there is something wrong with the amp.
It may not be the tube's fault, and if it was me, I wouldn't spend any more money on tubes until I had a tech go over the amp.
Good luck.
What I have been using for the last year of trouble free listening is a DecWare Zen Select.
I came across a collection of old 5U4GB rectifier tubes from RCA and Sylvania to name a few.
I never thought a rectifier tube change from the stock one would make that great a difference, but it did.
Now here is the nice part,they measured 60 on a tube tester,so they were still good.
The even better news is that in the DecWare amp, they should last longer than I will.
I suppose it depends on the amplifier design,but I think the Op's rectifier tubes may not have been all they were cracked up to be.
I don't think rectifier tubes are as prone to wearing out as fasat or faster than the output tubes, at least not in any amps that I am familiar with.
Perhaps there is something wrong with the amp.
It may not be the tube's fault, and if it was me, I wouldn't spend any more money on tubes until I had a tech go over the amp.
Good luck.