[Johnson] Re: Ranger keyer problem

[Mahlon Haunschild]

Phil,

Just use 6L6GCs.  They are plentiful, require no circuit changes, and 
exceed the old 1614 specs.

The 1614 was a 6L6 selected for higher voltage.  It was made back in the 
days before the tube manufacturers knew how to (or chose to) design a 
6L6 for higher voltage.  Eventually, of course, they did just that, 
first with the 6L6GB, then the 7027A (though the 7027A is really a 
somewhat different tube), and finally with the 6L6GC.

regards,

Mahlon - K4OQ

>Message: 1
>Date: Thu, 23 Oct 2003 11:32:58 -0400
>To: "Philip Atchley" <beaconeer at elite.net>, <Johnson at mailman.qth.net>
>From: Roy Morgan <roy.morgan at nist.gov>
>Subject: Re: [Johnson] Ranger keyer problem
>
>At 11:06 PM 10/22/03 +0000, you wrote:
>
>  
>
>>Incidentally, the two 1614 modulators test quite weak and with a "life" test
>>that drops.
>>    
>>
>
>Phil,
>
>These 1614's are a problem.. they are expensive to buy if you don't have 
>any (AES price is $30).  One possible substitute is the EL-34/6CA7 tube 
>being currently manufactured at prices of about $12 each.  The guitar guys 
>and gals use lots of them.  There are two considerations:
>
>1) Filament current. I just don't know if the EL-34 takes more filament 
>current. It may.
>
>2) Slightly different pinout.. the EL-34 *may* have a separate connection 
>for the screen on pin 6 (I think it does).  You'd need to clear any 
>connections on that pin being used as a tie point, and wire the pin to the 
>right place (cathode, I assume).
>
>The current manufactured Tesla EL-34's are extremely rugged and I'd expect 
>them to perform very well in the Ranger.  I do plan to look into this idea 
>when I restore the Ranger I have here.  My Ranger has a kaput modulation 
>transformer and burned tube sockets. It will get a replacement transformer 
>I found, and ceramic sockets. This will let me make substitutions for the 
>tubes as needed.
>
>I'd be glad to hear any ideas or more facts you may have on this.
>
>Roy
>
>
>- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
>7130 Panorama Drive, Derwood MD 20855
>Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
>roy.morgan at nist.gov --
>