[ARC5] [Boatanchors] Tube entenders

[Howard Holden]

Considering the high gain of the 1625, 807, etc., you could be asking for 
lots of trouble using an extender on these. Manufacturers often have to go 
through heroics to keep these tubes tame, and the extender could really 
upset the apple cart. Depends lots on the original design and operating 
parameters.

Howie WB2AWQ

-----Original Message----- 
From: Joe Connor
Sent: Sunday, January 06, 2013 5:47 PM
To: Roy Morgan ; ARC 5
Cc: boatanchors
Subject: Re: [Boatanchors] [ARC5] Tube entenders

Too true, Roy, too true.

                   Joe Connor





>________________________________
> From: Roy Morgan <k1lky at earthlink.net>
>To: ARC 5 <ARC5 at mailman.qth.net>
>Cc: boatanchors <Boatanchors at mailman.qth.net>
>Sent: Sunday, January 6, 2013 8:04 PM
>Subject: Re: [ARC5] Tube entenders
>
>
>On Jan 6, 2013, at 7:50 PM, Bob wrote:
>
>> ...  I can see the sometimes need for tube extenders for 7 pin 1625 and 
>> 837 tubes. 4 pin 811's and 7 pin 813's
>
>I have not seen any commercially made extenders for those bases, but there 
>well may have been some made.
>
>I call your attention to one of the Corollaries of Morgan's Law of Inverse 
>Perversity (about special tools), and encourage you to find some dead or 
>broken tubes, and a socket that matches, and make your own.  It could be 
>that extending transmitting tubes will alter the circuit capacitances and 
>inductances and lead to trouble.  The Command transmitter tube sockets are 
>recessed in a cylinder of aluminum for more than one reason.
>
>Morgan's Law of Inverse Perversity:
>
>If you have no spare for a critical part, that part will fail at the most 
>inopportune time.  If you do have a spare, or spares, the original one will 
>never fail and you'll never use the spare.
>
>Troubleshooting Corollary:
>
>If you have no information on an obscure failure mode, that failure will 
>happen to you at the most inopportune time.
>If you do have complete, detailed information, the system will never fail 
>in that way.
>
>Tool Corollary, inspired by Barney:
>
>If a job requires a special tool, and you have one handy, you'll almost 
>never need to use it.
>If you can't find the tool, and you buy or make a new one, the old one will 
>show up soon. Then you'll have two.
>
>
>Roy
>
>Roy Morgan
>k1lky at earthlink.net
>K1LKY Since 1958 - Keep 'em Glowing!
>
>
>
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