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[Amps] 2K Classic X filament issue

To: Amps Group <>
Subject: [Amps] 2K Classic X filament issue
From: Donald Fox via Amps <>
Reply-to: Donald Fox <>
Date: Tue, 3 Aug 2021 17:44:41 +0000 (UTC)
List-post: <>
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. 


Don    N8ECH
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