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In Reply to: RE: Do you have photo of trannies? posted by casouza on March 28, 2011 at 21:53:17
Actually this amp has two power transformers.They are located at the back of the amp and are vary large as well as the output transformers. That is why this amp weighs in at 60 lbs plus. Just thought I would clear that up. Good Day, Joe
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I did not know that. That's why a forum such as this one is so useful.
Good day 2 U 2
I concur with Casouza completeloy I had my MC100B for a couple of years now and must tell you that the best value for money on power tubes are the Sophia Electric sourced GEKT-88 a sweetheat of a deal the KT88-98's are not that great, too bass heavy and they shout in the mids. they shione on teh top end but it's 1 of of 3 while the GEK's do all things pretty good.
now if you wan to invest some serious $ into tubes the NOS 6550 TUng-Sols are the best bar none, the comes the Ei KT-90's pre conflict I thik type II's are teh best bass you can get out of this really good amp for the money.
I particularly enjoy it in triode mode, I think UL is only for rock & Roll, definetly triode is a lot more musical, better mids amazing stage end pristine clear top end.
As far as the KT120's I sincerely think the oputput tranny's are warm enough with the KT-88's if you push them harder with KT 120's you are likely to se early death due to metal fatigue or worse.
I'll put in GEKT88 and take teh rest of teh money and put it in some serious 5751 for the input tube This ampl simply loves them especially GE black plates 5751 amazing!!1 and soem good old 6SN7's like tung SOl tall bottles or Ken -Rads 6SN7-GT.
I have a few pairs of the RCA's gray glass, Ken-Rads 1940's, tung-sols 1950's tall bottles and some Sylvania, Raytheon and Tung-SOl black glass I trasure them all as they all bring something different to he table.
Mind you I have a lot more $ on tubes that I have on amp. you can imagine.
Nowadays my preamp has developed a hum that I haven't been able to get rid of so . . not listening to this combo much lately.
But I sincerely would not put KT-120á in it too many good tubes to buy into the hype of the KT120s, especially if you want to hear whatthe best this amp can do is most definitely into triode mode.
Hope this helps;
Gonzalo
Gonzalo, thanks.
I agree 100% with your choice of tubes,
5751 is way better than most 12ax7s: quieter, less microphonic, less grainy, cleaner sound.
Your 6SN7s are some of the best NOS tubes.
I believe you meant to write GEC or Gold Lion re-issue KT88s. These are amazing tubes, probably better that the original 1960s GEC KT88, if you value a very even tonal balance. The original KT-88 is slightly muffled in the treble range, though its sound is very seductive.
I do not believe that the KT120 is hyped, it comes from the same factory that makes the excellent GEC KT-88. It is just too risky to pop them in any tube amp without knowing the safety margins of the transformers. If the output transformers are specified to handle 100 watts and the power transformer can handle the extra heater current with almost no rise in temperature, then it is a GO.
Changing from KT-88s to KT-120s may increase power output 20-30%, which in terms of sound pressure levels adds roughly a decibel to the maximum room sound pressure level (peanuts IMO).
To increase room SPL levels noticeably, say by 3 db, one needs to double the power output.
I plan to try the KT120s in a power amp with beefy transformers, for their sonics, not for the relatively small in-room SPL gain.
Thanks for a great post.
Enjoy the music!
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