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

TexasRF at aol.com TexasRF at aol.com
Tue Nov 22 16:46:46 CET 2016


Both tubes will plug into the same 7 pin ceramic socket used by 813 and  
other tubes back 60 years or more. You have to add grid grounding tabs but 
that  is trivial. 
 
73,
Gerald K5GW
 
 
 
 
In a message dated 11/22/2016 9:05:51 A.M. Central Standard Time,  
nss at mwt.net writes:



Has anyone homebrewed  tube sockets?

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

Joe  WB9SBD

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
_http://www.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>_ 
(mailto:martin.andrew at btinternet.com) 
>  A : _moon-net at mailman.pe1itr.com_ (mailto: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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