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Subject: [Amps] ALPHA 77 SX UPDATE
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Date: Tue, 20 Aug 2002 20:47:49 EDT
I finally really checked out the tubes on the ALPHA 77 SX.  Initial ohm meter 
reading of filaments showed a very low resistance ... less than 2 ohms but 
something didn't seem right.  Applied 5 vac filament voltage directly to each 
tube and measured filament current and voltage.  Filament current was zero.  
Immediately measured resistance ... it was less than 2 ohms, but a with 
gentle knock on the tubes, resistance went to zero.  There must have been a 
few filament threads hanging on that gave the previous continuity reading.  

The first time I checked out the amplifier I got output, but it was probably 
just one working tube and the filament was fragile and lasted for one test.  
Looks like I need two 8877 tubes.  Anyone know where I can get any 8877 pulls 
for a good price?

Bob, K8MLM
Woodbridge, VA

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