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Old 1st August 2010, 10:53 PM   #11
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Originally Posted by Ty_Bower View Post
I picked up a set of the New Sensor Genalex re-issues. I've been very pleased with them. I haven't tried the Electroharmonix KT88, but I've heard reports they are a decent tube too. They're about half the price of the Gold Lion.
I have read that some people have had problems with the Gold Lion KT88, the theory being that it's amplifier dependent in that the tube doesn't like to be pushed past its spec. What cathode resistance are you running for the KT88?

I have also read lots of positive comments on the Gold Lion re-issue so I'm keen to try them.
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Old 2nd August 2010, 01:16 AM   #12
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Originally Posted by fandersen View Post
I have read that some people have had problems with the Gold Lion KT88, the theory being that it's amplifier dependent in that the tube doesn't like to be pushed past its spec. What cathode resistance are you running for the KT88?
I've got a Hammond 374BX power transformer in my Simple SE. I use 560 ohms for the "big" tubes, and 810 for everything else. B+ tends to be ~455 volts or less, depending on load. I'd be surprised if a KT88 can't handle 455 volts. The set I've got spend most of their time in a pair of Dynaco Mark III monoblocks, and B+ there is over 500 volts. I've read in a few places that Mark III have a reputation for eating KT88 in a hurry, but so far I don't seem to have that problem. I am careful to keep the heater voltage at spec, as those old power transformers were designed around 117VAC and tend to run hot on today's higher line. The 374BX appears to be properly wound for a 120 volt line, as all the filament windings are spot on.
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Old 2nd August 2010, 02:56 AM   #13
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The New Sensors Genalex Reissue are quite nice. The electroharmonix are ok as well but I prefer the new sensors. The New Sensors will handle moe plate dissapation as well if your B+ is a little hot.

I have a boneyard of dead JJ GZ34's. I bought several Sovteks and have had no issues with them at all so far.
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