review of gec kt66

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jeremy

LoveMachineologist
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i was blessed to be able to get my grubby hands on a pair of the gec kt66 tubes. thank you very much larry, that was a generous gesture.

these are hands down the best 6L6 type tube i have tried. ive used rca black plate 6L6gc's (still have a pair that i use for recording or when it really matters) and they are fantastic but the big, deep, tight bottom end, lush textured mid range, and silky smooth and detailed highs of the gec tubes are the perfect fit to my style of playing. clean they have the refined clang of a good 6l6 but with a deeper bottom and the focus of the mid range seems lower. rich, warm, and down right pretty. dirty the gec just kills. fat creamy harmonic liquid sustain that stays articulate even when pushed really hard with thunderous bottom end.

over the edge of break up is where i live most of the time. i wanna be able to turn up the volume and hit the strings hard and get singing sustain but be able to roll back the volume a little and get a sweet clean tone.

i tried them first in a blackfaced '69 super reverb with a strat and it was clean heaven at 3. chords were detailed and even, the bottom strings speaking clearly and the top strings bright and spanky. nothing harsh or shrill about the tone even on the bridge pup. at 7 the tone was fat and round with good high end detail and again a great bottom end that stayed focused and didnt mush out. then i tried them in my celtic aislinn 6L6 which is my go to amp when i dont need reverb. the amp is a tweed fender bandmaster but with the bass shelved up ala marshall. i had been running groove tubes kt66's in this amp so i wasnt expecting that much difference but i was nicely surprised.

ill finish this tomorrow, gotta catch some zzzz's
 
Re: review of gec kt66

cool review
thanks for sharing it
glad you enjoyed em
how much would a pair of these set back your average tonequiestador?
 
Re: review of gec kt66

the new kt66's are good tubes and i like them alot. they have many of the characteristics of the gec's but dont sound as musical when compared side by side. the biggest difference that i noticed is that the new ones seem to have a higher mid range focus than the old ones and dont sing as easily. both are thick sounding but the old gec's have this feeling of rolling thunder that is wonderful. single note lines sound full and thick but even heavy handed chord bashing doesnt loose definition, you can still hear the pick hit the low E string. in my celtic the tone would make billy gibbons jealous, blues rock heaven boys.

i cant say enough about these tubes. they are ferociously expensive but i gotta say they are freaking great. if your pocket is deep enough, get yo self some
 
Re: review of gec kt66

no joke, but they are fantastic. by no means can i afford those prices, but its nice to taste the best thats around
 
Re: review of gec kt66

jeremy, what do you think about the JJ Tesla KT66 ?
 
Re: review of gec kt66

Wow, killer review. I once heard a set of RCA Black plate 6L6GC's in a Fender twin reverb
and thought they were amazing but you Jeremy say you like the GEC's more. Wow!
I'm into JJ tubes nowadays with their 6L6GC's as my current favorites but now I'm curious.
 
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Re: review of gec kt66

i was blessed to be able to get my grubby hands on a pair of the gec kt66 tubes. thank you very much larry, that was a generous gesture.

VAULT MATERIAL


Jeremy:

I figured that a SD administrator was the only way to get the message out.

Now you and others know why I kept pushing these tubes.

It was for the tone and sustain qualities that I have not found in any other tubes.

I hope you keep enjoying them while playing your heart out.

Sincerely,

Larry "aka: Stratman"



PS: Pass the word around carefully, gentlemen...

PPS: These tubes require 1.3 amps for the heater circuit and not all transformers can handle that amount of current.
 
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Re: review of gec kt66

What was your final or best bias setting XXma? And on which amp?

i liked it best in my celtic aislinn but it could be cause i like that amp the best of the big bottle amps i use. i had scott make me a tweed bandmaster circut with switchable bias then i kept modding it till it was perfect. now it has marshall values for the tone caps, a mid control and no presence control and some other things like a gz34 instead of the 5u4. love it!!

i tried the bias everywhere from 34-60ma and i ended up liking it best in this amp at 44ma. in the super reverb i thought it sounded best at about 53ma, in the tweed bassman it was right around 50ma that sounded best. for some reason this amp didnt need the tubes to be biased as hot to get the goods. it just sings
 
Re: review of gec kt66

They show tube data on those tested at 400v on the plates. My Musicman HD-150 in the high power position makes closer to 700v at the plates...would my amp kill a pair of these, or would the bias have to be radicaly changed? I'd love to have a set, but $700 for four tubes is a bit off my chart.
 
Re: review of gec kt66

even with the bias set at 53 ma on the super the plates were still getting 425v or more and on the other amps im sure the tubes were getting at least 450v so the tubes handle over 400v fine. im not sure id put 700v on them, or any tubes besides kt88 or 6550. these are a direct 6L6gc replacement except for the extra current draw
 
Re: review of gec kt66

even with the bias set at 53 ma on the super the plates were still getting 425v or more and on the other amps im sure the tubes were getting at least 450v so the tubes handle over 400v fine. im not sure id put 700v on them, or any tubes besides kt88 or 6550. these are a direct 6L6gc replacement except for the extra current draw

On the Musicman Amp Forum, I found that the tubes in a Musicman only get biased to around 23 ma per tube, so would that make a difference?
 
Re: review of gec kt66

yup, one goes up other goes down. thats really cold, this is the one with the ss front end right?
 
Re: review of gec kt66

yup, one goes up other goes down. thats really cold, this is the one with the ss front end right?

Yup, some of them had tube PI, but this one is solid till the amp stage. It is really cold, but the poster on the MM site claimed many a Musicman was ruined by someone biasing it like a Marshall.
 
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