[Amps] 3-500Z tubes ...

[Bill Turner]

ORIGINAL MESSAGE: 
On Sun, 23 Dec 2012 07:39:38 +0100, ON4AEF wrote:

>
>Hi members;
>
>Does someone have any experience about use of this type of tubes from RF parts ?
>Especially about custumer name AMPEREX-EIMAC and possible ohters.
>I don't now whitch costumer name this have ?
> 
>
>     3-500ZG -RFP-MP RFP Matched Pair price 379.90 US$ 
>
>
>Regards Jean ON4AEF.

REPLY: 
Equally important for that tube is whether the filament pins are
soldered or welded. I was told that Amperex brand are welded. You can
save yourself some future trouble my insisting on welded. 

73, Bill W6WRT