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

Martin Andrew martin.andrew at btinternet.com
Tue Nov 22 10:20:25 CET 2016

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 
  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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