HA-10 Rectifiers

[hbreuer@debitel.net]

Hi Dave,

the 30 minute heating refers to the first power on after you installed or
exchanged the tubes or after the amplifier had been moved around. The
normal warmup should be 3 minutes. The Collins KWS-1 has a 180 second
thermal delay relay to automate the task. You want all mercury to be
vaporized before the HV is applied otherwise you may get a flashover or
even dead short which will take out your HV transformer.

73
Heinz DH2FA, KM5VT


Kechkaylo Dave (ATLINKS) wrote:

>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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