HA-10 Rectifiers

[Nick England]

There is an excellent tech note on this in the RCA Transmitting Tubes Manual.
As I remember, the 30 minute warm up is needed when the tubes are first
installed or if the equipment has been moved about - this makes sure all the
mercury within the tube has been vaporized. Afterward this initial warm-up, the
vapor will re-condense on the glass and can be re-vaporized with only a minute
or so warm-up.

3B28's don't require the same pre-heating cycle.

--------------------------
Nick KD4CPL

----- Original Message -----
From: "Kechkaylo Dave (ATLINKS)" <kechkaylod at ATLINKS.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, August 08, 2003 10:55 AM
Subject: HA-10 Rectifiers


> To All:
>
> I have recently acquired an absolutely beautiful HA-10 1KW Warrior linear
> amplifier. Sure, its built like a tank, and may cause a hernia if not lifted
> correctly...but... I would like to get it working. The 5-50 Henry swinging
> choke is okay....everything checks out okay. But, I was wondering: I've
> never used a linear that had a power supply utilizing half-wave
> mercury-vapor rectifiers. The manual mentions that one must heat the
> filaments in the UX-866As to fully vaporize the mercury BEFORE turing the
> high voltage on. I understand this, but the manual says heat the filaments
> for 30 minutes first, then in another part of the manual, it says to let
> them warm up for about one minute first. Which is correct?
>
> I know that there are replacements such as the 3B28s.....are these similar
> tubes that require preheating before application of the high voltage? I'm
> not sure; they're listed as Xenon-filled replacements. Any help is
> appreciated.
>
> Thanks,
>
> David Kechkaylo, W8QIZ
>
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