[Hallicrafters] Replacing tubes

[john]

A "weak" tube is rarely the cause of receiver malfunction and one
of the first things replaced. Like others have mentioned, unless the 
receiver is malfunctioning , or the tube is shorted, or very gassy, I'd 
suggest leaving well enough alone. Throwing away tubes that read 
less than green, when there's no negative symptom pointing 
specifically to the tube is wasting a device.

Tube testers were as much sales aids (for tubes) as diagnostic 
tools.

John K5MO


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