[R-390] Tube testers

[Roy Morgan]

At 08:38 AM 6/26/2007, Bernard nicholson wrote:
...The original signal Corps Specs for the RCA  AR88  calls for the set to 
perform to its specification with ANY or  ALL tubes at 30% emission   This 
is the reality !

Bernie and others,

I wonder if the (RCA-designed?) RBB and RBC receivers had the same kind of 
specification and performance.  They use the octal 6SK7 and 6AB7 tubes (or 
the military equivalents VT-117 and VT-176 respectively).

Bernie's experience with telephony equipment may have involved Western 
Electric tubes. These are legendary for long life and satisfactory service 
with low electrode voltages, especially filament voltage.  A very special 
application was in telephone repeater amplifiers that were enclosed in 
undersea cables and put on the bottom of the Atlantic Ocean (and other 
oceans, no doubt), and expected to work for a *very* long time.

I want to run my RAL and RAK TRF receivers with WE tubes, but have not yet 
found a more affordable source for the WE type 336A, the 10 volt filament 
equivalent of the type 41.  (AES sells them for about $20 each.)

Roy



- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
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