[Amps] Amp Supply LK500-zc tube asymmetry

[Pete Smith]

Sure, no argument - though problems in one tube (2 and 4) seem to be pretty 
well ruled out by the fact that it is always the front tube that glows more 
brightly, regardless of which tube is in which socket.

73, Pete N4ZR

  At 09:18 AM 3/20/2007, Tom W8JI wrote:
>>My hypothesis is that resistance between pin and socket electrode at the
>>filament pins was both reducing the amount of filament voltage on that one
>>tube and causing overheating at the tube pin, which eventually melted the
>>solder and also detempered the spring clips.  Because there wasn't enough
>>filament voltage, the tube was taking less than its share of the load.
>
>He actually could have one of four problems:
>
>1.) Someone might have floated the grids with glitch resistors (a very bad 
>idea) and one tube could have an open grid path
>
>2.) One tube might be low on emission either through low filament voltage 
>at the tube or a low emission filament
>
>3.) Somehow the RF drive or loading could be unequal.
>
>4.) The tube might have internal problems resulting in more concentrated 
>current than the other tube has, perhaps a broken grid wire. This can hot 
>spot one area of the anode.
>
>
>73 Tom