are these kt90's?
as seen at this ebay auction;
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3074564515&category=14973
seems they are ei version 3, but have nipple unlike EH.
thanks
as seen at this ebay auction;
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3074564515&category=14973
seems they are ei version 3, but have nipple unlike EH.
thanks
larger glass, pkate stucture/fins
They must have a larger plate structure, maybe using fins, and glass envelope to handle that kind of plate dissapation.
They must have a larger plate structure, maybe using fins, and glass envelope to handle that kind of plate dissapation.
Hi,
And people still want to deny that it's an EL519 resocketed?
Have a look:
ELECTRONSKA INDUSTRIA.
I used EL519s and derivatives for many years, I've taken them apart and compared them to the KT90 and I arrived at my conclusions, conclusions backed up by the industry.
These two are very close and the only thing that differs a little is the "spoed" on the grid.
A dutch word I can't seem to put into a single English word.
Basically, it's the grid to cathode winding distance.
If you can read a datasheet with all its details, you know what I mean.
Cheers, 😉
And people still want to deny that it's an EL519 resocketed?
Have a look:
ELECTRONSKA INDUSTRIA.
I used EL519s and derivatives for many years, I've taken them apart and compared them to the KT90 and I arrived at my conclusions, conclusions backed up by the industry.
These two are very close and the only thing that differs a little is the "spoed" on the grid.
A dutch word I can't seem to put into a single English word.
Basically, it's the grid to cathode winding distance.
If you can read a datasheet with all its details, you know what I mean.
Cheers, 😉
Hmmmm
The diameter spec is less than a KT88 and the height is the same. They must be using a different kind of glass, and the plate must be heavier and maybe longer??
Have you had a chance to see one up close and check it to see if it meets spec Frank?
Thanks.
The diameter spec is less than a KT88 and the height is the same. They must be using a different kind of glass, and the plate must be heavier and maybe longer??
Have you had a chance to see one up close and check it to see if it meets spec Frank?
Thanks.
Hi,
Yes...It does meet specs.
The ones I had measured years ago anyway.
Not the EH ones though...I think they're just brought to market recently. Expect them to be close to the EL509.
Cheers,😉
Yes...It does meet specs.
The ones I had measured years ago anyway.
Not the EH ones though...I think they're just brought to market recently. Expect them to be close to the EL509.
Cheers,😉
Hi Frank
Peeping into differences between KT88 and KT90 it seems most amps which use 88's won't gain an inch of Pout without major mods. The internal r of the KT90 is a snippet lower (as expected) than the 88, so the o/p tranny Z stays the same. However, gm of KT90 is somewhat higher. This tells me that g1 is closer to the cathode, and could be more suspectible to "taking off" and requires snubbing in some UL conditions...That's what I find going up from 6L6 to KT88. (that's a big leap).
I can understand those MI amp affectionados who like the smooth load lines of the 6L6 family using parallel 6L6 p-p quad o/p stages. . Obviously redundancy is way better than 2 tube p-p stages.
Clearly EI are keeping cards-to-their-chest about intricacies of their new KT90 vers 3. Do you know what it is; or anyone else or is this a marketing stunt ?
tschau
rich
Peeping into differences between KT88 and KT90 it seems most amps which use 88's won't gain an inch of Pout without major mods. The internal r of the KT90 is a snippet lower (as expected) than the 88, so the o/p tranny Z stays the same. However, gm of KT90 is somewhat higher. This tells me that g1 is closer to the cathode, and could be more suspectible to "taking off" and requires snubbing in some UL conditions...That's what I find going up from 6L6 to KT88. (that's a big leap).
I can understand those MI amp affectionados who like the smooth load lines of the 6L6 family using parallel 6L6 p-p quad o/p stages. . Obviously redundancy is way better than 2 tube p-p stages.
Clearly EI are keeping cards-to-their-chest about intricacies of their new KT90 vers 3. Do you know what it is; or anyone else or is this a marketing stunt ?
tschau
rich
Hi Frank.........good pics of KT90 details.......< ...sehr teure caption> ??? that bit can be dealt with....Those B+ figures in the table are a wake up call for the 6550.
Thanks shall digress......
rich
Thanks shall digress......
rich
Looks like the intrest in these new Eletro Harmonix KT90`s has kicked off again just as i`ve clocked over 200hrs on them. So i`ll start a new thread this ones getting full. I said i would report back on how their behaving.
Let me first tell you that they are 1 inch taller than my Sovtek Kt88, this is no small valve, the total recomened max plate dissapation for the plate is 54 watts that is very good, a good friend of mine also ordered 10 off and as with all new valves he gets he gives them a heavy test, he told me he put 580v on the plate and wound them up to 150ma current draw for 15mins to see what would happen ,and said they the plates did`nt even get the slightest bit red. That sounds dam good to me.
Now for the sound, stunning thats all i can say, i`ve had Svets 6550 and Sovtek Kt88 their good but do`nt compare to these, i own a pair of B&W801 s2 Matrix a ***** of a speaker to drive well. My amp rig is 4 box affair, 2x amps 2x power suplies with 4 output valves per channel i always listen in triode The 6550`s and the kt88`s could just drive them properly, but the KT90`s were so much more powerful, and controled that you thought that someone had doubled the amount of output valves.
Yet these valves are as sweet as any 6550 or kt88 that i`ve heard on my system. One other bonus is that they put out halve the heat of the 88 or 6550`s do`nt ask me why the heater current draw is the same and all other parameters are also the same, must be the size of the massive plate structure, get rid of the heat more efficiently.
Let me first tell you that they are 1 inch taller than my Sovtek Kt88, this is no small valve, the total recomened max plate dissapation for the plate is 54 watts that is very good, a good friend of mine also ordered 10 off and as with all new valves he gets he gives them a heavy test, he told me he put 580v on the plate and wound them up to 150ma current draw for 15mins to see what would happen ,and said they the plates did`nt even get the slightest bit red. That sounds dam good to me.
Now for the sound, stunning thats all i can say, i`ve had Svets 6550 and Sovtek Kt88 their good but do`nt compare to these, i own a pair of B&W801 s2 Matrix a ***** of a speaker to drive well. My amp rig is 4 box affair, 2x amps 2x power suplies with 4 output valves per channel i always listen in triode The 6550`s and the kt88`s could just drive them properly, but the KT90`s were so much more powerful, and controled that you thought that someone had doubled the amount of output valves.
Yet these valves are as sweet as any 6550 or kt88 that i`ve heard on my system. One other bonus is that they put out halve the heat of the 88 or 6550`s do`nt ask me why the heater current draw is the same and all other parameters are also the same, must be the size of the massive plate structure, get rid of the heat more efficiently.
Well here we are in 2007 and the EI factory has stopped production on the KT90. We couldn't use the type III's anyway, they were bad. The Type I tubes I have in my VTL 225's were great. Now its time for replacements. Yes I can have the amps rewired for the 6550 tube, but I would rather stay with the KT90.
There are EH Kt90's out there, I know nothing of them. Are they are direct, exact replacements for the EI's?
And of course any new word on the old EI factory equipment?:
There are EH Kt90's out there, I know nothing of them. Are they are direct, exact replacements for the EI's?
And of course any new word on the old EI factory equipment?:
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