[GreenKeys] Western Union Rectifier 69-B

[Richard Knoppow]

----- Original Message ----- 
From: "David Burns" <dvdbrns at rcn.com>
To: "DR HOUSE" <k9tty at dls.net>
Cc: <greenkeys at mailman.qth.net>; <vibroplex at mindspring.com>
Sent: Tuesday, April 24, 2012 11:17 AM
Subject: Re: [GreenKeys] Western Union Rectifier 69-B


> Ummm I was thinking of the big 866 half-wave mercury vapor 
> rectifiers.  NVM!
>
> On 4/24/2012 1:05 PM, DR HOUSE wrote:
>> Not sure where the "base down" comes from. The 83 in the 
>> TV-7D/U tube
>> tester is horizontal.
>> However the operation of a tube tester is not continuous.
>>
>> ??
>> Don
>> K9TTY

    See my other post.  Its possible that in the TV-7 the 
tube is in a position where the mercury pool forms where the 
filament can evaporate it and it does not come in contact 
with the elements.  However, its a small, portable device 
and might be stored in any position.  The instruction book 
does not have any special precautions other than specifying 
a 15 minute warm-up where the set has been exposed to very 
cold conditions.
    So, I don't know, it seems the 83 is immune from 
problems that affect its larger brothers despite the same 
warnings in the RCA handbook.



--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com