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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 31st October 2008, 09:12 PM   #11
Jim McShane is offline Jim McShane  United States
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Originally posted by tubelab.com

I have a Simple SE that uses EH KT88's. These tubes give up a little bit of detail in exchange for power and bass that is uncharacteristic of an SE amp. When played through my 96db home made speakers that have 15 inch woofers the bass can be heard inside the house across the street. I got 6 of these tubes used for $10 each. I put one pair in this amp when I made it, and they have never been removed. I often run them hot (100 mA) and they don't seem to mind.
This is a very interesting post to me!

The KT-88 EH mid & upper bass is superb - the lowest octave is just a bit lacking in quantity (not quality). It would appear that the SE design which often is somewhat limited in the lowest bass anyway (no insult to Tubelab or his designs intended!) may make this a moot point in evaluating the EH. Based on my experience coupled with Tubelab's, it sounds like the EH is ideal for that application.

The 100 ma. is no problem at all as long as dissipation is under 40 watts max (a bit less would help the tube live longer).

The Genalex KT-88 is wonderful, but they are twice the price of the EH. So you have to think hard why you wouldn't use the EH. I love high value per dollar tubes, and the EH KT-88 is clearly one of them. You get a hell of a lot of performance for your hard earned money.
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Old 1st November 2008, 05:40 PM   #12
N1ESE is offline N1ESE  United States
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Jim, thanks for adding your input to this thread.

Tyson, and others.. regarding cheap 6L6GC's mentioned in this thread. I noticed AES has matched pairs of Chinese 6L6GC's for $18.40. I haven't seen any other deals much better than this (unless one wants quads or more quantity). Not a bad price for smoke testing new Simple SE circuits.
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Old 1st November 2008, 09:04 PM   #13
Ty_Bower is offline Ty_Bower  United States
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Buy them off eBay from the guy I linked above. They come out cheaper than the AES price.

Speaking of "good for smoke testing", I just used a quad in a Dynaco Mk3 restoration project for the initial test. The poor things suffer a bit under 560+ volts on the plate, don't they?

Click the image to open in full size.
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Old 1st November 2008, 10:37 PM   #14
N1ESE is offline N1ESE  United States
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Originally posted by Ty_Bower
[B]Buy them off eBay from the guy I linked above. They come out cheaper than the AES price.
Unfortunately, he doesn't have any available at the moment. I've already emailed him. Jim McShane has some "cosmetically challenged" EL34's for $5 ea. that I just ordered for bench testing.
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Old 2nd November 2008, 03:16 AM   #15
doodlebugs is offline doodlebugs  United States
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I've been using the EH KT-88s now in both my Mac MC-75s and the Citation II. These are very nice tubes, IMHO. Stable and solid in either amp. Purchased from Jim McShane, I'd recommend them anytime - especially if you're planning to 'play around' with them in a DIY amp.

I also have a couple of sets of the EI KT-90 Series II that are held in such high esteem. They're nice but, frankly, the EHs aren't that far back although I can understand why Jim draws the distinction he does with them.

I use the EH KT88s these days so I don't run the EI KT90s all the time.


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