[Amps] 3CX1200 tubes

[Hardy Landskov]

Hi Dick and everyone.
Just an FYI.   I have a beautiful Chicago F-725 filament transformer, 7.5 V, 
25 amp that will power 3CX1200, 3-1000, and 4-1000 if anyone is needing one. 
I don't know what they go for but $65 + shipping would be good for me. I 
don't like to use the email to sell stuff but this is getting a little rare 
in my book. Excuse me if I offended anyone.
73 Hardy N7RT

----- Original Message ----- 
From: "Dick Hanson" <dick at dkhanson.com>
To: <hamradio at oz.net>
Cc: "Amps Reflector" <amps at contesting.com>
Sent: Sunday, March 22, 2015 7:34 AM
Subject: Re: [Amps] 3CX1200 tubes


> Hi Randy....
>
> The tubes are electrically identical, but there are some things you'd want
> to know if you're considering an amp.
>
> The A7 and D7 have 'long' grid leads that internally terminate in one of 
> the
> pins on the bottom.
>
> The Z7 and the YC229 (bigger anode version of Z7) feature a grid ring 
> which
> grounds the grid with a very short connection.
> In other words, the grid ring is bolted to the chassis (so no socket
> required).
> This is a good deal to help eliminate parasites.
>
> My 2 cents.
>
> 73
>
> Dick, K5AND
> Austin, TX
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Randy
> Sent: Saturday, March 21, 2015 9:30
> To: amps at contesting.com
> Subject: [Amps] 3CX1200 tubes
>
> Aside from the physical and filament differences is there much difference 
> in
> RF performance between the 3CX1200A7, D7, and Z7 tubes?  Is one more 
> suited
> for HF SSB service (lower IMD, etc.)?  If you had all three types 
> available
> and wanted to build an HF SSB amp project from scratch, which of these 
> would
> be the best choice?
>
>
>
> Thanks.
>
>
>
> Randy, W7HR
>
> Port Orchard, WA
>
>
>
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