[Boatanchors] 4CX-350J Tubes

[Barrie Smith]

Having used these tubes (years ago), I should caution that they (unlike the 
4CX250) were designed with linear-service in mind (eg. no grid current).

If I remember correctly (and I may not), the control-grid has a close to 
zero-watt dissapation rating.

Not suitable for grounded grid, of course.

In grid-driven, class AB1 service a pair will deliver over 600 watts of 
relatively clean signal with very little drive power (perhaps under 5 
watts).

73, Barrie, W7ALW


----- Original Message ----- 
From: "Mike McCarthy, W1NR" <lists at w1nr.net>
To: "'FRED - W4FJF'" <ka2hlw at netzero.net>; <boatanchors at mailman.qth.net>
Sent: Sunday, September 04, 2005 2:01 PM
Subject: RE: [Boatanchors] 4CX-350J Tubes


> One of the 60's vintage Radio Handbook's had a two tube 4CX250 amp for HF.
> 3 of what you got could easily do legal limit.  There are also VHF amps in
> the Radio and ARRL Handbooks from the 60's and 70's, but you will probably
> have to build substantial bandpass filters on the outputs to keep up with
> current FCC spurious standards.
>
> The QRO reflector and "amps at contesting.com" are good places to ask about
> these tubes.
>
> Mike, W1NR
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of FRED - W4FJF
> Sent: Sunday, September 04, 2005 1:15 PM
> To: boatanchors at mailman.qth.net
> Subject: [Boatanchors] 4CX-350J Tubes
>
> Good Morning All,
>    I have 8 sets of 4CX-350J's (chimneys and sockets, too) and wonder what
> I can do with them. 2 or 6m amps? Any ideas, or construction articles come
> to mind? I wouldn't mind a good signal on 6m, so I would be really
> interested in that. Any B/A amps use these tubes? I bought them from Fair
> Radio Sales years ago, listed as N.O.S. RCA. Appreciate any info you can
> supply. You can contact me off list at w4fjf at yahoo.com.
>                   TNX FM FRED - W4FJF, 73
>
>
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> $$ For vintage radio info, see the HCI web site $$
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>
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>