[Amps] 3-500Z viable after long storage?

[Carl]

There are several ceramic tubes that are notorious for seal leakage. The 
4CX300A is a classic. OTOH it is the better process for several reasons.

For EimacVarian it was sloppy manufacturing of glass tubes when they moved 
to Nevada.

Carl
KM1H


----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: "AMPS" <amps at contesting.com>
Sent: Monday, August 10, 2009 12:57 PM
Subject: Re: [Amps] 3-500Z viable after long storage?


> ORIGINAL MESSAGE:
>
> On Mon, 10 Aug 2009 12:26:41 -0400, "Carl" <km1h at jeremy.mv.com> wrote:
>
>>No seal is perfect however.
>
> REPLY:
>
> I'm wondering if some seals are better than others. Many years ago 
> Tektronix
> stopped making CRTs out of glass and went to ceramic because the seal was
> better. I suspect the same applies to high power tubes. Nearly all 
> "modern" high
> power designs use ceramic.
>
> 73, Bill W6WRT
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