[Moon-Net] 4CX1000K

Joe nss at mwt.net
Tue Nov 22 17:44:44 CET 2016


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
Sig
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:
> Sig
>
> 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, 3^rd order and 
> 5^th 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.
>
> https://www.rfparts.com/media/catalog/product/cache/1/small_image/252x/9df78eab33525d08d6e5fb8d27136e95/4/c/4cx1500a-tay.jpg
> 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’ve
>
>     built 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>
>
>     [mailto:moon-net-bounces at mailman.pe1itr.com] On Behalf Of Joe
>
>     Sent: Tuesday, November 22, 2016 10:04 AM
>
>     To:moon-net at mailman.pe1itr.com <mailto:moon-net at mailman.pe1itr.com>
>
>     Subject: 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 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>
>         <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
>
>     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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