[Amps] 3-500z

[R.Measures]

On Oct 26, 2005, at 1:26 PM, jsb at digistar.com wrote:

> On Wed, 26 Oct 2005, R. Measures wrote:
>
>>> umph - well if the typical off-the-shelf AL-80B sits idle at 2900v to
>>> the plate (I do not know if this is its normal operating voltage),
>>> 1600w input would seem to be a lot of plate current for 1 tube.
>>
>> The AL-80 instruction manual says 500mA + is okay.  Some people tell 
>> the
>> truth and some don't.
>
> The photos i've seen of AL-80Bs have Amperex tubes - I thought Amperex
> built their tubes using graphite plates that get "sick" with that kind 
> of
> use.

Graphite anode or metal anode, the limiting factor is linear-region 
cathode/filament emission. 400mA of anode current is the rating from 
all manufacturers.

cheers, Jason
>
> Something about graphite poisoning or deformation of the anode surface.
>
>
> --
> 73 Jason N1SU
> http://n1su.us/
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org