[Amps] Henry 2K-2 failure

[Mark - N5OT]

It turns out Henry protected the plate meter with a fuse.  Good news. 
The fuse measures blown/open, so hoping it protected the meter.

I'll replace the fuse and report back.

Thanks,
Mark N5OT



On 9/6/2024 7:47 AM, Mark - N5OT wrote:
> Greetings.
> 
> Today I have a 2K-2 that has developed a problem.  For grins / out of 
> curiosity, I thought I would see what I could get out of a pair of used 
> Eimac Y-826s that had tested good some years ago.  After I tested them I 
> wrapped those tubes up and put them on the shelf waiting for the right 
> moment.
> 
> The amp ran fine for maybe 2 hours on CW at probably 25-50% duty cycle. 
> I was surprised how much drive was needed - really the tubes performed 
> no better than the 3-400Zs I took out and set to the side.  Oh well.
> 
> When I was doing some additional testing the following happened:
> 
> 1. The little red breaker popped when I let up on the footswitch.  So it 
> happened during a non-key-down moment.  I let up on the footswitch, 
> heard the click, amp now did not transmit.  Checked breaker - it was 
> popped so I reset it.  Amp now worked again but plate current meter no 
> longer works.  Yes, I know I should have protected it.  I am assuming it 
> was not protected.  Oh well.
> 
> 2. Amp transmits just as it did, however, now the tubes glow orange 100% 
> of the time, even while idling at key-up.
> 
> I am assuming this is not a sustainable condition, something changed or 
> broke, and I need to not run it like this.
> 
> I am also assuming there are multiple smart guys reading this who know 
> from the description above what has happened and can guide me toward 
> restoring the amp to operation.
> 
> Learning by experience,
> 73 - Mark N5OT
> 
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