It might be good to keep an eye out for the old Henry 4k or 4k-2 (not ultra)
that used that tube. It already has the socket and those decks (and whole
amp) are plenty robust with a little freshening of the PS. That would also
give you a spare tube!
Sam, N9FUT
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Carl
Sent: Wednesday, December 15, 2010 8:01 PM
To: Roger (K8RI); amps@contesting.com
Subject: Re: [Amps] 5CX1500 socket ( changed subject )
The ring is the suppressor grid which is grounded, this is a full pentode.
The screen, control grid and filaments are the tabs from top to bottom.
Carl
KM1H
----- Original Message -----
From: "Roger (K8RI)" <sub1@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Wednesday, December 15, 2010 6:59 PM
Subject: Re: [Amps] 5CX1500 socket ( changed subject )
>
>
> On 12/15/2010 12:29 PM, donroden@hiwaay.net wrote:
>> 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.
> The screen is not a tab, but a larger diameter ring above the tabs.
> IF and I emphasize the IF, the tab spacing is the same as it is on the
> 4CX-1000 and 4CX1500B (I believe it is) then the hole in the chassis
> only needs be large enough to clear the tabs, and the socket mounted on
> stand offs long enough for the suppressor ring to mount flat on the
> chassis. The tube would set a "little lower" but should not be difficult
> to remove/replace. IOW the socket is sub mounted. This would then
> require holes in the chassis similar to (but smaller than) the mounts
> you see for the YC-156 on e-bay.
>
> As for stability "I'd think" the Pentode would be a bit more stable than
> a Tetrode, BUT they are both high gain tubes so would be far more
> susceptible to feedback than a Triode in GG.
>
> OTOH I've seen 5CX1500s "with sockets" go for less than the price of the
> socket on e-bay and it's far simpler if you have the SK840 socket which
> is the listed air system socket for the 5CX-1500 rather than having to
> adapt a Tetrode socket.
>
> If you are not in a big hurry I'd put the SK840, SK-840, 5CX1500,
> 5CX-1500 in the "Saved Searches" and watch for one
> There is a 5CX1500A RF deck (Item 270678399402) on there now with a bit
> over two days left. with a price of $299USD, but I don't think he ships
> overseas. OTOH his feedback rating is a tad low. However this is
> probably representative of what's out there.
>
>
>
> 73 and good luck,
>
> Roger (K8RI)
>> Don W4DNR
>>
>>
>>
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>>
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