The 5CX1500A is a good tube and extremely 'robust'.
But, like its smaller siblings, the 4CX1000A and 4CX1500B, can become unruly
if the amp design is inherently unstable.
There are several proven options available to the builder to make it stable:
passive grid and grounded screen to name two.
The proper socket, including the type that optionally grounds the screen, is
an excellent way to begin.
Two chaps that successfully ran this tube for a number of years include
Marv, W6FR and Frank, W0OKC (sk).
Best,
Dick, K5AND
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of DAVE WHITE
> Sent: Wednesday, December 15, 2010 3:42 PM
> To: amps@contesting.com; donroden@hiwaay.net
> Subject: Re: [Amps] 5CX1500 socket ( changed subject )
>
> My memory may fail me here (RF damage, perhaps) but I seem to remember Bob
> G4UJS tried building an amp with a 5CX1500 some years ago, but had
problems
> with stability. I'm not sure if he ever got to the bottom of the issues.
>
> Not sure if this is any help but it may be worth chasing up before
spending big
> bucks on tubes/sockets.
>
> cheers
>
> Dave G0OIL
>
> --- On Wed, 15/12/10, donroden@hiwaay.net <donroden@hiwaay.net> wrote:
>
> From: donroden@hiwaay.net <donroden@hiwaay.net>
> Subject: [Amps] 5CX1500 socket ( changed subject )
> To: amps@contesting.com
> Date: Wednesday, 15 December, 2010, 17:29
>
> Quoting Sam Carpenter <sam@owenscommunication.com>:
>
> > I think the socket you need is: SK840. I think these trade on ebay
> > frequently.
>
> As expensive as the 5CX1500 is, I'd spend an extra hundred to use the
> right socket. These tubes tabs don't mount to a chassis easily.
>
> Don W4DNR
>
>
>
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