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Old 26th February 2010, 01:55 PM   #41
JoshK is offline JoshK  Canada
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I've seen it said numerous times that the OS EI KT-90s "killed" in triode. If those were based on the EL519 type tubes, would it follow that the EL519-types would also be glorious in triode?

I ask because the EL519-types are easier to come by and being a diy'er we are not tied to specific pinouts that the KT88 types require.

I am thinking that George's PP KT88 project idea that he has written about might be a good place for these types.
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Old 26th February 2010, 02:26 PM   #42
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EH KT90's are the solution. Can recommend them. I'm getting thd figures lower than all the variants of KT88's about and with an extra power bonus. I guess alot depends on the output stage match and especially the screens need to be driven fairly hard (9mA).

richy
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Old 27th November 2011, 03:08 PM   #43
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Default EHkt90 in simple se

I have a unique stereo. Plate amps driving open baffle 15" woofers below 200Hz driven by my Moscode 600.
Tubelabs simple se in triode mode above that driving Audio Nirvana 10" open baffle.
I set up my dB meter and checked with a sterophile disc the freq response with both KT88 then my new EH KT90 (in the simple se) really no difference in output (not louder). A few frequencies were up (or down) a dB or so but mostly identicle output.
The only change was when I changed to the KT90 I upped the bias (according to my calculations about 43watts plate dissipation= no plate glow)
Tubes are still a little too young to say if I like them better or not, but this little amp shows clear differences in sound from other various tubes I've tried
Paul
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Old 29th November 2011, 05:27 PM   #44
rknize is online now rknize  United States
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I run mine at around 40+ Watts as well. They have a unique sound as triodes when biased hot.

Russ
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