RE: Tungsol 6550 - two dark plates or a black & a grey one ? - highfell - Tubes Asylum

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RE: Tungsol 6550 - two dark plates or a black & a grey one ?

In Reply to: RE: Tungsol 6550 - two dark plates or a black & a grey one ? posted by Joe Appierto on September 26, 2014 at 18:33:54:

You had me worried but having done some more research - I saw a 4 digit date code on a Tung Sol Valve on page 4 of the old Tube Valley Magazine issue 19. This has the letters JAN - 6559 on top and 6528 underneath.

This also ties in with this comment from http://www.dannychesnut.com/Music/Hammond/HammondLeslieIdentifiers.htm

"Tung-Sol 6550 tubes have the following format: XXXYYWW, where XXX is the EIA manufacturer code, YY is the last two digits of the year and WW is the number of the week in that year. 3227204 is a Tung-Sol tube manufactured during the fonurth week of 1972. Tung-Sol 6550 tubes made for other companies (like RCA) have a four-digit date code only."

Attached is one of the boxes that they came in. So they could be JAN an ex-Military version, which presumably is a tougher version.

I have had a first listen to them.
Listening to Trevor Pinnock's the Vivaldi Concertos, the English Concert - Soaring violins , the music flows effortlessly, the highs just appear, liquid sounding like flowing water, the harp's strings sound so reallistic, the harpsichord sounds like it is playing live in front of me, with the natural string timbre when each key is played. Not as deep bass as the EI KT90s or as punchy. NOS GEC KT88s are more forward/ in your face, Mids & highs are great.
Natural sounding, (not over tubey or over warm), and not harsh in any way.

Very happy to have them. They are a welcome addition to the GEC KT88s, and more latterly the EIKT90s that I have only had a brief listen to.

It would seem that the three getter is a grey plate but when listening I can't detect any discernible difference between the two of them.

BTW they are true NOS - how long before they get broken in?

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Follow Ups Full Thread

Topic - Tungsol 6550 - two dark plates or a black & a grey one ? - highfell 14:32:42 09/26/14 (8)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Michael Samra 23:59:46 09/27/14 (4)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - highfell 09:24:59 09/28/14 (3)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Michael Samra 10:41:53 09/28/14 (2)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Joe Appierto 12:32:31 09/28/14 (1)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Michael Samra 16:46:04 09/28/14 (0)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Joe Appierto 18:33:54 09/26/14 (2)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - highfell 13:44:13 09/27/14 (1)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Joe Appierto 14:32:20 09/27/14 (0)

Follow Ups

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - highfell 13:44:13 09/27/14 (1)

RE: Tungsol 6550 - two dark plates or a black & a grey one ? - Joe Appierto 14:32:20 09/27/14 (0)

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