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In Reply to: RE: Ei KT90 Question posted by Jim McShane on October 21, 2016 at 11:35:21
Thanks Jim I will inquire.
Follow Ups:
I have a quad of Type III's with that exact same printing. Bought them to use in my Citation II before I learned about the concerns with the Type III. I never tried them.
Would it be less risk to run them in an amp that has adjustable bias in a range of 20 - 25 watts (450 v at 50 mA)? Or, do they just not sound good biased cold?
Warming them up once to check ought to be OK...though the fixed bias would be needed to run them up to full ratings and confirm no red spots, yes? You'll either have good ones or you won't.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
iŽd like to add that i never ever had any problems with type 3. sounds as good as type 2 in my gear.
N.
"Science only illustrates the current state of errors"
Nobody said they didn't sound good. The issue was red plating due to misaligned screens.
jus to put a fine point on that 'red plate' issue, this was at dissipations well under their ratings. IIRC, per Jim's writings on the subject can happen as low as 25-30W.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
iŽd like to add that i never ever had any problems with type 3. sounds as good as type 2 in my gear.
N.
"Science only illustrates the current state of errors"
A lot of people had a lot of problems with them - you were lucky to get good ones!!
Just toasted one of the Quad of iii's I got from you Jim...took a 2W/10R current sense with it. Hope I could find a single somehow...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Wow, sorry to hear Doug. You've had those for a LONG time - I went through my records to see when you got them and I can't find it. When did you get them, do you recall?
That would have been 2001-2002 perhaps? I got them for amps build around Dyna A441 outputs...which were basically not as good as I hoped they were...LOL They went on to service in my Mk.iii on and off as those amps went into service( and out ). Up to yesterday, they'd been happily doing service in my W6m. That accounts for probably the last 4-5 years.
I do need some EL84, will send you a note on that momentarily.
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
http://www.ebay.de/itm/201677575326?clk_rvr_id=1112909439432&rmvSB=true
"Science only illustrates the current state of errors"
Those are type III - and as I've posted for over 10 years - you can't tell if the tube is going to red plate or not just by looking at it. It has to be tested.
Yah, no question there Jim. For that price, I would want a guarantee that I could believe in that they'd tolerate 100 mA of plate current at 400V plate and screen...with absolutely no plate red spots( in a dark room ).
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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