From Kevi–(at)–pscaleAudio.com Wed May 13 15:19:58 CDT 1998
Article: 104476 of alt.guitar.amps
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From: Kevin Deal / Upscale Audio
Newsgroups: alt.guitar.amps
Subject: Re: WTB: GZ34 tube
Date: 13 May 1998 12:00:01 -0700
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mjol–(at)–kpowerlink.com wrote:
>
> Anybody know a source for a couple of these – I’ve found Chinese manuf.
> ones, but I would like something better.
>
> Thanks,
>
> Marc

What you have is

G.E. – U.S. made has a copper strip that runs up and down. Excellent.

British made is a Mullard and has a hole in the center of the plastic
locating key on the bottom. Could be branded anything. Etched batch
code towards bottom of glass will ususally have a B in it.

Japanese – could be branded many names. Some have a X shaped seam in
the glass on top. Will also say Made In Great Britain may times, but is
not.

Sylvania Fat Bottle

Holland – Looks like a Mullard but the galss top is flatter. Usually has
a hole in the locating key like a Mullard, since they owned Mullard.

5Y3 – branded by National as a 5AR4.

—
Regards,

Kevin Deal Precision selected fine vintage audio tubes
Upscale Audio Authorized Sonic Frontiers, Anthem, Golden Tube
2504 Spring Terrace Audible Illusions, Presence, Margules/Magenta
Upland, CA 91784 Basis, Benz, B&K, Meadowlark, PSB, Energy
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Fax (909) 985-6968 Nordost Flatline, Synergistic, and much more