[TenTec] OT Again: Eico 710 GDO

[Dr. Gerald N. Johnson]

On Sat, 2009-02-07 at 18:03 -0500, John Graves wrote:
> Jerry.
> 
> Thanks for the tips.  I have a trip to the hardware store in my future. 
>    My GDO lives again.  I also feel better about my knight-kit tube 
> tester that has a place of honor on the shelf in my shop.  It called the 
> tube as shorted and way low on emission when I tested the 6af4a (made by 
> RCA for Eico....those were the days HI.)
> John Graves
> WA1JG
> jh.graves at verizon.net
> 
A grid to cathode short was the most common failure for the 6AF4 family.
It had tiny geometry and small spacings to oscillate up to about 850 MHz
in the UHF tuner or converter. And short life from the grid being very
close to the cathode.

If it said "made by RCA for Eico", its was the original tube. Lasted
over 40 years, that's not bad.

73, Jerry, K0CQ