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

Joe nss at mwt.net
Tue Nov 22 16:04:10 CET 2016


Has anyone homebrewed tube sockets?

I mean WOW, the prices on some sockets, Wow!

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 11/22/2016 8:47 AM, W1KSZ wrote:
>
> 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
>>         *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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