[Boatanchors] Mercury Rectifiers

[Geoff]

And when all else fails use the 1N2637 plug in direct replacement. I refuse 
to use those tubes.

The 3B28 is OK but I found several NOS diodes for cheap when I picked up 
the1KW Gates iron at a defunct AM station

Carl
KM1H




----- Original Message ----- 
From: "Nick England" <navy.radio at gmail.com>
To: <jfor at quikus.com>
Cc: <boatanchors at mailman.qth.net>; <boatanchors at puck.nether.net>; 
<milsurplus at mailman.qth.net>
Sent: Monday, April 23, 2012 12:52 PM
Subject: Re: [Boatanchors] Mercury Rectifiers


>I sent John a copy of the relevant pages in the RCA Transmitting Tubes
> manual TT-4 which has a very good discussion of the topic. RCA says
> Preheat and Condition.
> Summary -
> Preheat with normal filament voltage at least 30 minutes with no anode 
> voltage.
> Let cool and condense.
> Then Condition at normal filament voltage and apply 1/6 normal anode
> voltage (after the usual mandatory recommended warm-up period) for 5
> minutes. Gradually increase the anode voltage over 30 minutes. If a
> flashover occurs during this process, reduce anode voltage until
> flashover ceases, maintain this reduced voltage for a few minutes,
> then resume the treatment.
>
> http://www.we0h.us/Amateur_Radio_stuff/Books/RCA-TT-4-Transmitting-Tube-Manual.pdf
>
> cheers,
> Nick K4NYW
>
> On Mon, Apr 23, 2012 at 11:31 AM, J. Forster <jfor at quikus.com> wrote:
>> Hi,
>>
>> Is there an issue with Mercury pooling in rectifiers, like the 866, in
>> long term storage that would cause them to blow over more easily?
>>
>> If so, is there a fix?
>>
>> Best,
>>
>> -John
>>
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