[Amps] RPC 3-500 tubes

[Jim]

I would try one tube at a time with 25 or 30 watts of drive. See if you 
have a dead tube.



Thanks
73
Jim W7RY

On 1/4/2021 5:01 PM, Robert Wood, P.E. (retired) wrote:
>   
>
> Recently purchased set of 3-500 tubes Made PRC and installed in AL82 amp
>
> This AL82 had the Zener diodes replaced with diode string before I purchased
> it YEARS ago.
>
> Old arrl handbook shows 3-500 (single tube) with 30 watts input (GG-class B)
> with 110 ma grid current.
>
> My AL82 shows about 100ma grid current, two tubes, 80 watts out on driver
> rig and about 1KW out.
>
>   
>
> Anyone else running set of Chinese 3-500 and could share grid current
> readings?
>
>   
>
> and yes this is all issue because can't get power out
>
>   
>
> 73 W5AJ
>
>   
>
> Robert
>
> Midland, Texas
>
>   
>
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