[AMPS] AL-1500, AL-82, AL-1200, QRO???

[measures]

>
>Rich wrote :
>
>>> The 3cx1200A7 is virtually immune to grid/fil. shorts.  3-500Zs are not. 
>
>I'd just like to counter that by saying that in 15 years of looking after 
>the amps for our multi-multi contest group the ONLY fatal tube failures 
>which I have seen have been 2 grid-filament shorts in 3CX1200A7s. I've 
>probably been through 30 amps with various tubes in including
>
>3CX800s with and without grid current trips (Alphas, Amp Supplies, K1FOs at 
>VHF and many Ten Tec Titans),
>3-500Zs (TL922, Amp Supplies, Tokyo Hi Power)
>4CX800s (Alphas)
>8874 / 8877 (Henrys)
>4CX250Bs (home brew, Tokyo High Power)
>and a bunch of other similar stuff.
>
>Just my experience, but they are most definitely not imune to that problem.
>
Did the amplifier that shorted the 3cx1200A7s have a glitch resistor. ?  
Who made the amplifier?
 
cheers,  Andy
>
>
>
>
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>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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