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In Reply to: RE: EL34 vs KT-77 posted by Bob Latino on September 15, 2015 at 05:24:43
Great to hear from you.
I'm enjoying the HECK out of that kit!!! You did a wonderful job designing and packing it. I had no problems with the instructions. Couldn't be clearer.
I have to be honest. When I first opened that box and laid out the parts I thought what the heck did I get myself into. But once the solder fumes started I was HOOKED!!! It was a lot of fun - thanks!
I'm taking my time to write a review on your ST-70 kit. I want to do it justice and not rush it.
The tubes you included are top notch and I have no complaints. One of the perks of having tubes is rolling. So I want to take advantage of that.
Thanks for the suggestion and I trust your choice being you actually used them on this amp.
thanks
charles
Follow Ups:
Charles,
The other thing you should consider is to allow the amp to break in completely (100 - 200 hours of play time) BEFORE you change out any of the stock tubes. Trying out different tubes in your amp before the break in is complete is like trying to "hit a moving target". After 200 hours of play time the amp is fully broken in and the sound will pretty much stabilize. It is then easier to compare the sound of different tubes that you can use in the amp. The CENTER (initial voltage amplifier) driver tube affects both channels and is the least expensive way to make subtle changes to the sound of the amp. Changing out the two side (phase splitter/inverter) driver tubes has much less influence on the sound of these amps. You can use any 12AU7, 12BH7, 5963, 5814 or 6189 tube in any or all three driver positions. You can also mix and match these tubes with the only caveat being that the two side driver tubes should be of the same type.
Bob
The best value kit out there by far and 95% American made other than a few capacitors and sockets which you can't get anymore in new production.These are so much better than the original amps in every way from the iron to the milspec quality circuit board to wire quality and performance blows the original out of the water.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
The repro output iron is better than (not equal to) the originals? Wow!!!
There is some myth to 'old iron' just the way it is.
Bob's repro iron is that he uses..I put a 10khz sq wave thru both and his was cleaner.He doesn't use the same iron as everyone else does..I used a rotel SS amp with 5k non inductive resistors on the primary and ran a 10khz sq wave thru the original transformers which I have several of and one of Bob's and it was cleaner thru his..I was going to try a 20khz sq wave next.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
Edits: 09/15/15 09/15/15
They you very interesting for that information - Interesting!!!
A far as tubes go I was fishing around for some ideas for a Christmas present.
I like the amp as it is right now. So letting it break in would be a pleasure.
charles
some people praise the TOSHIBA 6GB8 as the ultimate EL34 substitute...
N.
The times, they are changing...
If you can go this route, I would definitely consider it. The KT-66 has a much better tone, than most EL34 types that I've used.
I have not used the new Gold Lion KT-66, so I can't comment on it. But, the original Gold Lion MOV/GEC KT-66 were awesome tubes.
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