Identify Philips tube

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Identify Philips tube

Postby Teddypoulsen on Sun May 13, 2012 8:13 pm

New user here.. :)

I recently bought a '77 Marshall super lead 100 watt.
It is supposed to have a NOS Philips tube in V1, but can anyone help me to identify what tube it is, and if further information is available on this tube?

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Re: Identify Philips tube

Postby OldSchoolDave on Mon May 14, 2012 12:44 pm

CV492 = Mil spec version of ECC83/12AX7.

Hard to be certain from your pic, but if the date code is delta-2J3, it tracks to Philips' Herleen plant (one reference: http://www.audiobanter.com/showthread.php?t=55560 ).

Nice tube. How does it sound?

Dave
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http://www.OldSchoolDave.com
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Re: Identify Philips tube

Postby Lyre-crunch on Sat May 19, 2012 12:21 pm

Codes are same as for ecc83, standard Heerlen production (branded Philips Miniwatt, Amperex, Valvo, occasionally Mullard etc). The CV number is used on tubes meant for use in the military and some other state-run organisations, but doesn't always mean that the tube is ruggedized or special in any other way.
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Re: Identify Philips tube

Postby dotfret on Wed Nov 07, 2012 3:59 pm

I read the code as
I65
delta 2J3

Which I would interpret as I6 - ecc83 short plate, 5 - design revision 5, delta - Heerlen factory, 2 - year, probably 72, J - October, 3 - week 3.

That's about it, unless it was made in 82 (vaguely possible but unlikely).
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Re: Identify Philips tube

Postby Lyre-crunch on Wed Nov 07, 2012 9:18 pm

Correct code crunch, but actually the year has to be 62, because production had ceased by 82, and a 72 would be coded I66 sporting what is known as a dimple disc getter.
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