I was gonna say i still use some Siemens 34s in my Plexi I pulled out of my old 100B.Originally posted by SQUAREHEAD
When Reinhold forst started production of the Xtcy, he ALWAYS used Siemens 34's... for the first few years, until he could no longer get a good supply. They all (Ecstacys) run around the 500 mark. I've always used them in my Xtcy's and NEVER once had any problems.
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Yep!!Originally posted by Ed DeGenaro
I was gonna say i still use some Siemens 34s in my Plexi I pulled out of my old 100B.
I love 'em. Sheet...the ones in my plexi have been in that amp since about 5 years...and had already been in the 100B 2 years prior.Originally posted by SQUAREHEAD
Yep!!
Great tubes, Ed!!
I've never had one die in 20 years of using them in about everything I've ever owned.
keith
Yep I"ve used Siemens in my Orange or120 head that runs about 500volts and never had a problem despite all the warnings I got!!Originally posted by Ed DeGenaro
I was gonna say i still use some Siemens 34s in my Plexi I pulled out of my old 100B.
What's with all the warnings anyway?Originally posted by ericb
Yep I"ve used Siemens in my Orange or120 head that runs about 500volts and never had a problem despite all the warnings I got!!
eRIC
I'm assuming that you haven't tried more than a handful of these tubes in your various amps. It's always possible to get lucky. Some tubes will beat the odds.Originally posted by SQUAREHEAD
What's with all the warnings anyway?
They seem fine in any amp I've ever used them in...![]()
Hi MikeOriginally posted by Blue Strat
I'm assuming that you haven't tried more than a handful of these tubes in your various amps. It's always possible to get lucky. Some tubes will beat the odds.
Even if only 10 to 20% (which would be optimistic) would fail in amps with plate voltage over 450V, it would be pretty lame to recommend them for such applications knowing this fact.
SEDs, GT 6CA7GEs or Mullards (which are VERY pricey).Originally posted by Shemp
Hi Mike
Thanks for the reply. What do you recommend for the EL 34 Shiva?
Mike - Speaking of the GT 6CA7GE's, I was wondering if you had any observations on properly biasing these tubes. Some resources I've seen say that they should be treated as EL34's for biasing purposes. Groove Tubes, however, (or at least Myles) says that they should be biased more like 6L6's or in between 6L6's and 6550's. This would result in a significantly warmer bias setting, if I'm doing the math correctly.Originally posted by Blue Strat
SEDs, GT 6CA7GEs or Mullards (which are VERY pricey).
Well...I guess I've been quite lucky. I have owned 5 Bogners in the last 14 years and every Marshall 100 watter I've owned/own has Siemens 34's in it, some of them are real old amps with plate voltage pushing 550...Originally posted by Blue Strat
I'm assuming that you haven't tried more than a handful of these tubes in your various amps. It's always possible to get lucky. Some tubes will beat the odds.
Even if only 10 to 20% (which would be optimistic) would fail in amps with plate voltage over 450V, it would be pretty lame to recommend them for such applications knowing this fact.
Hey Mike,Originally posted by Blue Strat
I'm assuming that you haven't tried more than a handful of these tubes in your various amps. It's always possible to get lucky. Some tubes will beat the odds.
Even if only 10 to 20% (which would be optimistic) would fail in amps with plate voltage over 450V, it would be pretty lame to recommend them for such applications knowing this fact.
Oh I believe him, Mark.Originally posted by Mark Kane
I've seen Seimens run forever at real high voltages and I've also seen three of them blow within a couple minutes at around 500 volts from personal experience. If they are gonna go they will go pretty quick. Bogner may be running 150k bias resistors between the PI and out put tubes or may have a high value screen resistors in his amps, both of which will help. They are nice sounding tubes but Mike K. is right about them.
I used them in my 67 plexi SB with 560+ volts on the plates. They lasted 10 years and now I have a pair (from the 10 year old quad) in my JCM800 2204.Originally posted by ericb
Yep I"ve used Siemens in my Orange or120 head that runs about 500volts and never had a problem despite all the warnings I got!!
eRIC