[Amps] Henry 2K-4 Failure

[Mark - N5OT]

I was not thinking about checking the continuity in the tubes themselves 
when I balked at opening up the amp deep enough to check the continuity 
at the sockets!  I didn't connect those dots initially.

So anyway, you guys straightened me out.  Here's how it went:

Check tubes cold.  One tube has a grid to cathode short.  Problem solved.

Put two new (used) tubes in, amp runs like it should.

Thanks!

73 - Mark N5OT



On 3/19/2020 7:31 PM, Mark - N5OT wrote:
> This is getting more and more exciting all the time.  Stay tuned.  So 
> to speak.
> 73 - Mark N5OT
>
> On 3/19/2020 5:45 PM, VE1DT wrote:
>>
>> Hey Jim & Mark,
>>
>> Stayed failed to me means that the sucker is welded.
>>
>> How do I know this for certain ,you ask? My new AL80B became 
>> intermittent within the first few months after getting it. The grid 
>> meter was pegged negative at the zero end. After a few more times, it 
>> finally stayed failed. I pulled out the tube and measured a short on 
>> the pins of the tube. Easy peasy. I had a VOM, but no spare tubes to 
>> swap with.
>>
>> I am sure there are intermittent cases out there as well.
>>
>> -- 
>>
>> Gerald, VE1DT
>>
>> >/Grid to cathode short & ?stayed failed? means you just need an /
>>
>> >/ohmmeter. No need to swap tubes, etc./
>>
>> >
>>
>> >/Gerald, VE1DT/
>>
>> >
>>
>> ## Nope.  The  grid  to cathode  short  only  happens  with tube  fil
>>
>> lit..... not  when  cold.
>>
>> When cold,  both  a HI  pot  tester....  and  also  a megger wont  work
>>
>> either.
>>
>> Jim VE7RF
>>
>
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