From dhaugen–(at)–ail.idt.net Fri Oct 18 10:02:20 CDT 1996
Article: 16451 of rec.audio.tubes
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From: Gruvmyster
Newsgroups: rec.audio.tubes
Subject: Re: Manufacturer of Hytron tubes?
Date: Fri, 18 Oct 1996 00:31:31 -0500
Organization: IDT Corporation
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Mic Kaczmarczik wrote:
>
> I recently bought a pair of NOS Hytron brand 6V6GT’s. The acceptance
> date on the box indicated 5/53. The inside of the glass has a opaque
> dark gray coating, and the base of the tube has the inscription
> “Licensed under applicable patents” or something like that.
>
> I’ve seen the inscription on some of the RCA tubes I’ve used. Did
> Hytron make their own tubes, or resell tubes made by other
> manufacturers?
>
> Thanks,
>
> –mic–
> –
> — Mic Kaczmarczik — Unix Services, UT Austin Academic Computing –

Yes, Hytron made their own tubes. At some point in the mid-fifties, CBS
bought them. Hytron was based in Danvers, MA.

This does not mean, however, that your tubes were produced by them. As
far as I can tell every tube manufacturer purchased tubes from other
manufacturers and put their own brand on them. Perhaps they did this
because they weren’t running a particular number at the time. For
example, I have some types of GE-branded tubes that are obviously
Mullards.

Many tubes had some kind of licensing agreement printed on either the
box or on the tube itself. I don’t think you can tell who made it based
on that.

Hope this helps…

Doug