Thanks to all who replied, both on the list and off! Lots of great comments
and suggestions.
I removed the RF deck and blower last night and did a detailed visual
inspection. No rust or corrosion anywhere. Just dust which dislodges easily
with a small brush so it should clean up very nicely.
We (my girlfriend and I) eyeballed every component and connection and found
... thanks to her sharp eyesight ... two bad parts. The 25 ohm/25 watt
wirewound resistor in the B- line is opened. You can see where the coating
has flaked away and the little wires are open. And two of the 75 pf fixed
caps that get switched in for the plate tuning in the tank circuit had
flashed over. The 40 meter cap and one of the 80 meter caps. Someone must
have tried to run it into a bad load. The are both cracked and burned with
chips missing from them.
I suppose the resistor may have taken one for the team when the caps blew
chunks ... I just hope the plate current meter didn't get damaged. I can't
see anything wrong inside it, but I guess I will find out in time.
If I can get the replacement parts pretty quick I should be to the tube
cooking stage in a few days and may have it on the air soon.
Thanks again!
73,
Theo K4MO
> -----Original Message-----
> From: Theo Bellamy <Theo.Bellamy@Spirittelecom.com>
> Sent: Apr 4, 2005 12:32 PM
> To: amps@contesting.com
> Subject: [Amps] Refurbishing a Henry 3K Classic II
>
> I have a Henry 3K Classic II that hasn't been turned on in over ten years.
I
> am hoping to get it on the air again. Any input or ideas on the following
> questions would be most welcome:
>
> 1. What type of cleaner and lube is best for the chain drives?
> 2. Should I attempt to clean and/or lube the variable inductor? It moves
> very freely and looks clean, but I am a bit concerned about oxidation or
> tarnish.
> 3. Do the contacts that engage the fixed tune caps ever need burnishing?
> 3. Should I let the tube "cook" for a while before applying B+? If so, for
> how long? It is a 3CX1200.
>
> Anything I should look for specifically? Haven't worked on a Henry before.
> Seems like a pretty nice amp.
>
> Thanks in advance for any suggestions.
>
> 73,
> Theo K4MO
>
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