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OU812
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xx KT-66 in a SLO
« Thread started on: Apr 28th, 2015, 7:11pm »

Anyone running KT-66s in their SLO? Haven't seen much discussion here. I've read on other forums that they are beefier with more thump,; maybe even tame the highs some. Can those running share their experience and how they have them biased? Appreciate it.
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Giga
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xx Re: KT-66 in a SLO
« Reply #1 on: Apr 30th, 2015, 05:55am »

I've tried Gold Lion KT66's, biased at around 25mA as recommended by Bill Sundt. They seemed to accentuate the shrillness/harshness that's lurking in an SLO. The lows were indeed a bit bigger but I didn't need that at all so they came out again real quick.

The funny thing is that that same set works wonderfully in my RK100..

Giga
« Last Edit: Apr 30th, 2015, 05:56am by Giga » User IP Logged

OU812
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xx Re: KT-66 in a SLO
« Reply #2 on: May 8th, 2015, 10:26am »

I was hoping to get more feedback before I took the plunge. I guess from the little response no one is running these. I do appreciate your response Giga. So I finally broke down and picked up a virgin quad of Groove Tube KT-66C pre-fender sellout. I guess they don't make these anymore; the guy was closing shop and had these left over in the original boxes. From what I've read elsewhere the bias point should be at least 70% plate dissipation. So I got these big bottles bias up at 497 V and 35.7 mA, just a tad over 70%. They sound freakin fantastic! Thick tight bass with nice well defined break-up and less brittleness and treble harshness that I found to be the case with the Sovteks. Almost sounds like a new amp. In my opinion a definite improvement on the amp's tone and overall response characteristics. Cheers!

on Apr 30th, 2015, 05:55am, Giga wrote:
I've tried Gold Lion KT66's, biased at around 25mA as recommended by Bill Sundt. They seemed to accentuate the shrillness/harshness that's lurking in an SLO. The lows were indeed a bit bigger but I didn't need that at all so they came out again real quick.

The funny thing is that that same set works wonderfully in my RK100..

Giga
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JLB
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xx Re: KT-66 in a SLO
« Reply #3 on: Jun 4th, 2015, 12:58am »

I was on ground floor trying to get E&H to build the Gold Lion KT66 i.e., Genelux copy. Great tubes, but I found mids too thick for me. Stock 5881's still rock more than any others.

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James L. Burke III
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