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

Ted Hartson awombat at earthlink.net
Tue Nov 22 17:12:21 CET 2016


I have used the YU-209 see: 
http://forums.qrz.com/index.php?threads/8877-3cx1500-yu-209-tubes.202153/ 
and traded a big TV tube for several of these they seem to be a 
'hardened 8877'. My understanding is these tubes are used in medical MRI 
machines and are replaced at 100 hours routinely. the $250 USD seems 
typical Ted WA8ULG


On 11/22/2016 8:46 AM, TexasRF at aol.com wrote:
> 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>
>>>         > 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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