Just wondering what your thoughts are on current production tubes. I've heard JJs have been weak recently. The KT88s I modded my 65 with were crap and on the Hi setting so I've switched back to EL34s but being cautious with tubes and running in Low.
I haven't used any JJ's from recent manufacture but I ONLY bought mine from Eurotubes and NEVER had any issues, even when tubes bought from other sources WERE having problems. Mike.
...as I haven't purchased new tubes in quite some time. However, the JJs, Winged Cs, and Sovteks I've used all work fine without incident. Prefer older US tubes when I can find them (Sylvania, GE, Phillips, RCA, etc). As always, rebias correctly after retubing.
I'm looking out for some old tubes for the first and I'm dropping different ones in and out.
While this thread is alive I've got another question regarding biasing.
My 210 sixty five runs 780 volts stable. I've just been going off the 25mv across the emitter resister method. Because there's quite a few more volts on the plate compared to stock (is it 720 on this amp?) Would it be better to bias it cooler?
Absolutely. You don't know, unless you are measuring tubes separately if one is pulling a crapload more current. Even measuring tubes separately, I set mine at 22ma-23 with a 12ax7a driver and they last. Mike.
Sent you a message...
I have a 210 Sixty Five 210 combo and head version, sent you a message...
What kind of tubes do you run?
Hiya,
Just wondering what your thoughts are on current production tubes. I've heard JJs have been weak recently. The KT88s I modded my 65 with were crap and on the Hi setting so I've switched back to EL34s but being cautious with tubes and running in Low.
Best
Richard
I haven't used any JJ's from
I haven't used any JJ's from recent manufacture but I ONLY bought mine from Eurotubes and NEVER had any issues, even when tubes bought from other sources WERE having problems. Mike.
Not much help here...
...as I haven't purchased new tubes in quite some time. However, the JJs, Winged Cs, and Sovteks I've used all work fine without incident. Prefer older US tubes when I can find them (Sylvania, GE, Phillips, RCA, etc). As always, rebias correctly after retubing.
Thanks guys and new question on bias
I'm looking out for some old tubes for the first and I'm dropping different ones in and out.
While this thread is alive I've got another question regarding biasing.
My 210 sixty five runs 780 volts stable. I've just been going off the 25mv across the emitter resister method. Because there's quite a few more volts on the plate compared to stock (is it 720 on this amp?) Would it be better to bias it cooler?
Best
Richard
Absolutely. You don't know,
In reply to Thanks guys and new question on bias by Dubby Dub Dub
Absolutely. You don't know, unless you are measuring tubes separately if one is pulling a crapload more current. Even measuring tubes separately, I set mine at 22ma-23 with a 12ax7a driver and they last. Mike.
I have an early Sixty-Five
I have an early Sixty-Five Reverb head with the 12AX7. I was thinking about finding a 210 cab for it, or selling it as I have a HD130 Reverb also.
2-10 sixty-five
In reply to I have an early Sixty-Five by Soultrain65
Thanks for touching base. However, I was able to find a 210 Sixty Five.