Testing KT-90's Ei NIs Yugoslavia

speakerfritz · 22nd November 2011, 09:54 PM

I have 15 Ei NIs Yugoslavia KT-90's I want to test and match up before putting on ebay. Does anyone have GM numbers for KT-90's? Been googling around and can't find anything. I know they are direct replacements for KT=88's and 6550's, but need to make sure about any GM differences.

Thanks

Original Burnedfingers · 22nd November 2011, 10:06 PM

I have about 10 or 12 of them myself. None are close enough to make a matched pair. They do sound good but nothing like a good pair of KT88's.

Zen Mod · 22nd November 2011, 10:06 PM

........

speakerfritz · 22nd November 2011, 10:46 PM

Thanks for the data sheet. it says 12.7/@250 for triode and 13.4/@250V and 10.1/@400V for pentode. Is that 12700GM, 13400 GM and 10100 GM?

speakerfritz · 22nd November 2011, 11:09 PM

ok, here's what I found out, the kt90 is a modified el509 (cap wired to the socket instead of cap) and the el509 has a gm of 18000. So I'll use that. The ones I tested so far hit that number pretty easy.

22nd November 2011, 09:54 PM	#1
speakerfritz diyAudio Member Join Date: Jul 2008	Testing KT-90's Ei NIs Yugoslavia I have 15 Ei NIs Yugoslavia KT-90's I want to test and match up before putting on ebay. Does anyone have GM numbers for KT-90's? Been googling around and can't find anything. I know they are direct replacements for KT=88's and 6550's, but need to make sure about any GM differences. Thanks

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bora is a nice guy from Serbia - Yugoslávia	destroyer X	Solid State	724	Yesterday 11:47 PM
FS: EL84 EI Yugoslavia & EL84 Tungsram NOS Bulk	radiostar	Swap Meet	3	29th January 2012 08:46 AM
EI KT-90 news	linko	Tubes / Valves	5	10th February 2007 06:50 AM
new diy forum - for the ex-Yugoslavia	Branimir	Everything Else	0	7th November 2005 05:12 PM
Need PP KT-88 amp design and KT-88 for triode use?	Norris Wilson	Tubes / Valves	7	23rd February 2005 12:12 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

22nd November 2011, 10:06 PM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	I have about 10 or 12 of them myself. None are close enough to make a matched pair. They do sound good but nothing like a good pair of KT88's.

22nd November 2011, 10:46 PM	#4
speakerfritz diyAudio Member Join Date: Jul 2008	Thanks for the data sheet. it says 12.7/@250 for triode and 13.4/@250V and 10.1/@400V for pentode. Is that 12700GM, 13400 GM and 10100 GM?

22nd November 2011, 11:09 PM	#5
speakerfritz diyAudio Member Join Date: Jul 2008	ok, here's what I found out, the kt90 is a modified el509 (cap wired to the socket instead of cap) and the el509 has a gm of 18000. So I'll use that. The ones I tested so far hit that number pretty easy.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)