[Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ?

W1KSZ w1ksz at earthlink.net
Tue Nov 22 15:47:53 CET 2016


You can download the datasheets for each tube and verify if any 
differences do exist.


73, Dick, W1KSZ


On 11/22/2016 7:38 AM, F5HRY wrote:
>
> Be also aware that the mechanical dimensions are not strictly similar.
>
> As fas as I remember (quite a long time since I finished my last amp), 
> the anode
>
> heatsink is a bit higher for the 3CPX.
>
> 73,
>
> Hervé F5HRY
>
>     > Message du 22/11/16 10:46
>     > De : "Martin Andrew" <martin.andrew at btinternet.com>
>     > A : moon-net at mailman.pe1itr.com
>     > Copie à :
>     > Objet : Re: [Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ?
>     >
>     >
>     Thanks for the replies on this.
>     I was pretty certain the two tubes were interchangable with a few
>     minor voltage
>     adjustments, but it is always better to ask than go blindly into
>     something one is not 100% sure about.
>     So in January I will be starting the search for a spare 3CPX1500A7
>     preferably with Europe.
>     Again many thanks for the help and information..
>     Martin, GM6VXB
>
>         ----- Original Message -----
>         *From:* Martin Andrew <mailto:martin.andrew at btinternet.com>
>         *To:* moon-net at mailman.pe1itr.com
>         <mailto:moon-net at mailman.pe1itr.com>
>         *Sent:* Monday, November 21, 2016 7:49 PM
>         *Subject:* [Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ?
>
>         >
>         Looking to get a spare tube as down to my last one now after a
>         failure in the old HPA.
>         Heater failure yet again even with a good three stage heater
>         'step start' fitted.
>         Been looking for a 3CX1500A7 (8877) but they seem to be
>         getting pretty rare in the UK and also very expensive.
>         So also looking at the 3CPX1500A7 which except for Anode
>         voltage seems pretty similar, and also much lower price.
>         I know that the EHT supply I have will not go to much above
>         3.5KV so wondering if the 3CPX1500 is happy with a much lower
>         anode voltage than the specified 10KV max.
>         Before I look at ordering one (or should I stay with the 8877
>         ?) does anyone know if the 3CPX is a 'near' direct replacement
>         for the 3CX series tube ?.
>         Physical size is the same and looks like it will go easily to
>         200Mhz.
>         Martin, GM6VXB
>
>         >
>
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