[Hallicrafters] When do you replace tubes?

[Edward B Richards]

Hi Skip;

I replace all tubes below the stated gm. If you don't want to do that,
you can use the GOOD-?-BAD on the meter. If it is in the GOOD, use it. I
believe the gm is set for the center of the GOOD scale. Good luck.

73, Ed Richards K6UUZ
 

On Tue, 4 Jan 2005 14:56:17 -0800 Waldo Magnuson <magnuson at mac.com>
writes:
> Hi,
>     My question is when do you replace tubes in Hallicrafters 
> receivers. 
>   I use a Hickok 6000A tube tester which is a dynamic mutual 
> conductance 
> and reads out Gm.  As an example in a SX-100 receiver I'm working on 
> I 
> read some of the following measurements:  For a 6AU6 (book value) 
> 2300 
> (measured) 1475 or 64%, For a 6C4 (book) 2200 (meas.)1700 or 77%, 
> And 
> for a 6SC7 (book) 1000 (meas.) 350 & 200 or 35% & 20%, and so forth.
>     My inclination is to replace any tube below 75% Gm reading of a 
> new 
> tube.  What are other opinions?  Thanks.
> 73,  Skip Magnuson  W7WGM
> 
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