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

[measures]

>
>Someone wrote:
>
>> >> The 3cx1200A7 is virtually immune to grid/fil. shorts.  3-500Zs are
>> >> not. 
>
>Andy replied:
> 
>> 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
>
>
>The 3CX1200A7 is probably the most reliable tube out there. 
>Failures are very low. It is also one of the least stable, has high 
>internal capacitance, and is moderately hard to drive. That's the 
>tradeoff.
>
>From a manufacturing standpoint, the most common failure in a 
>3CX1200 has been a grid-to-filament short. Second most common 
>has been low emission (mostly in brand new tubes). All in all, it is 
>a very reliable tube.

The 3cx1200Z7 has 1/10 as feedback C.  It costs $19 more.  Why not use it?

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


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