I had the same on my 2KD-3. Turned out the tube socket pins on one socket
were a little dirty/corroded. Cleaned and tightened them and all is well
now.
Dave W7VM
On Tue, Aug 3, 2021 at 10:44 AM Donald Fox via Amps <amps@contesting.com>
wrote:
> Gents:
> As you may recall, I have a soft spot for the Henry Classic consoles. I
> recently acquired a 2K Classic X console from the original owner, and want
> to being it back to life. It's interesting to note that This 2KX was
> originally built as a domestic 2KX, with the smaller plate xformer. The
> owner eventually purchased the larger export 1171 plate xformer, and
> installed it. The amp was purchased from AES in Wickliffe, Ohio, back in
> the early 80's, and used frequently until the owner left town in 1986. From
> then on, it sat unused for 35 years.
>
> After a thorough cleaning, I am seeing a brightness difference in the
> 3-500z tubes. I tried swapping the tubes from front to back, and the front
> tube consistently has the weaker filament. I have also tried a second,
> known good set of tubes, with the same results. A visual inspection of the
> underside of the RF deck revealed no obvious problems. Filament voltage is
> around 11 unloaded, as the filaments are in series.
>
> I have not enabled the HV section as of yet. The bearings in the blower
> were semi frozen, such that a new motor was required. That part is done.
>
> Thoughts and suggestions please.
>
> TIA
>
> Don N8ECH
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