[Moon-Net] 4CX1000K

Peter Blair g3ltf at btinternet.com
Tue Nov 22 18:17:51 CET 2016


SigI built a socket for one of those about 15 years ago from ally,teflon and spring stock, roughly following the design in the 1990 ARRL HB,(p31-63)  took a while to get it right but it works FB.
73 Peter G3LTF 

From: Joe 
Sent: Tuesday, November 22, 2016 4:44 PM
To: Terry Price ; moon-net at mailman.pe1itr.com 
Subject: Re: [Moon-Net] 4CX1000K

1- As a possible fun to do project.
2- I have 8 yes Eight of those tubes that I got for Free. ( long Story )

Joe WB9SBD


The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com

On 11/22/2016 10:23 AM, Terry Price wrote:

  Now the SK800 series sockets are expensive and hard to find but why would anyone go to the added expense and trouble of building an amp with one of those dinosaurs when an 8877 will run rings around it and all you need for bias is a 50w zener diode????? And, 3rd order and 5th order distortion products are better on an 8877.

   

  From: Joe [mailto:nss at mwt.net] 
  Sent: Tuesday, November 22, 2016 11:26 AM
  To: Terry Price; moon-net at mailman.pe1itr.com
  Subject: Re: [Moon-Net] 4CX1000K

   

  I'm sorry guys,
  I should have changed the subject some when asking that question.
  I'm talking about a 4CX1000K type of tube. No Pins. Kind of a slidy twisty thing.


  Check on the prices for the sockets for those babys!

  Joe WB9SBD


  The Original Rolling Ball Clock
  Idle Tyme
  Idle-Tyme.com
  http://www.idle-tyme.com

  On 11/22/2016 9:39 AM, Terry Price wrote:

Brand new sockets are $12 for 3 of them on ebay. All you need is 4 spacers(or a stack of washers), 4 long screws and 4 pieces of finger stock. I’vebuilt probably 50-60 8877 amps and never used a real 8877 socket. Terry – W8ZN From: moon-net-bounces at mailman.pe1itr.com[mailto:moon-net-bounces at mailman.pe1itr.com] On Behalf Of JoeSent: Tuesday, November 22, 2016 10:04 AMTo: moon-net at mailman.pe1itr.comSubject: Re: [Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ? Has anyone homebrewed tube sockets? I mean WOW, the prices on some sockets, Wow! Joe WB9SBD The Original Rolling Ball ClockIdle TymeIdle-Tyme.comhttp://www.idle-tyme.comOn 11/22/2016 8:47 AM, W1KSZ wrote:You can download the datasheets for each tube and verify if any differencesdo 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), theanodeheatsink is a bit higher for the 3CPX. 73,Hervé F5HRY  Message du 22/11/16 10:46De : "Martin Andrew" mailto:martin.andrew at btinternet.comA : moon-net at mailman.pe1itr.comCopie 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 minorvoltageadjustments, but it is always better to ask than go blindly into somethingone is not 100% sure about. So in January I will be starting the search for a spare 3CPX1500A7preferably with Europe. Again many thanks for the help and information.. Martin, GM6VXB----- Original Message -----From: Martin AndrewTo: moon-net at mailman.pe1itr.comSent: Monday, November 21, 2016 7:49 PMSubject: [Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ?  Looking to get a spare tube as down to my last one now after a failure inthe 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 rarein the UK and also very expensive.So also looking at the 3CPX1500A7 which except for Anode voltage seemspretty similar, and also much lower price.I know that the EHT supply I have will not go to much above 3.5KV sowondering if the 3CPX1500 is happy with a much lower anode voltage than thespecified 10KV max. Before I look at ordering one (or should I stay with the 8877 ?) does anyoneknow 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 ________________________________________ _______________________________________________Moon-Net posting and subscription instructions are athttp://www.nlsa.com/nets/moon-net-help.html   ________________________________________ No virus found in this message.Checked by AVG - www.avg.comVersion: 2016.0.7924 / Virus Database: 4664/13447 - Release Date: 11/21/16   _______________________________________________Moon-Net posting and subscription instructions are athttp://www.nlsa.com/nets/moon-net-help.html    _______________________________________________Moon-Net posting and subscription instructions are athttp://www.nlsa.com/nets/moon-net-help.html     _______________________________________________Moon-Net posting and subscription instructions are athttp://www.nlsa.com/nets/moon-net-help.html       





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