Philips DP7-32 cathodic ray tube

[Paolo Cravero]

Hello.
Last weekend it was [electronics] flea market time! It was very nice to attend this kind of event after 9 months, while it was sad to see on the tables "new" stuff that belonged to who has passed away.

Besides the whole display board from an expensive Rohde&Schwarz EK47 receiver with sockets, 74141 and 6x ZM1182 Nixies, I scored a NIB Philips CRT: DP7-32-01. While the cardboard box has been opened, the tube is still sealed in the plastic bag and part of the marking has stuck to it.

While I know the DG7-32 part, I cannot find online a datasheet for DP7-32 CRT. Comparing other Philips datasheets (https://frank.pocnet.net/sheetsD1.html) the DP marking should refer to dual-color/persistence tube: blue with short, greenish-yellow with long persistence.

Am I correct to assume that DG7-32 and DP7-32 should have the same electrical characteristics?

A clock with this kind of tube does require a custom firmware with proper effects.
Paolo

[Ian Vine]

Must have been nice to get back out there. 

Ian

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[Tidak Ada]

Hi Paolo,

 

Indeed the tubes are electrically identical.

The second letter in the type number denotes the phosphor color and properties.

The tube has a symmetrical deflection. Important for a clock J

 

Here a copy of my Philips Pocket Book for Ham’s with the explanation of the Pro Electron Code (European equivalent of Jedec) and the data of your tube.

 

Have fun,

            eric

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[jf03...@gmail.com]

Isn't that the one used in the Marantz 10B (and presumably the Marantz 10)?  You can probably infer a useful set of operating conditions from the service manual.

[Paolo Cravero]

Thank you Eric,

the summary sheet is very helpful! While I prefer round shaped CRTs, from a phosphor color collection point of view I should stop skipping square ones on display at those events.

@jfeng, yes, the DG7-32 CRT (green, short persistence) was used in the Marantz tuner and many other devices. Looks like Marantz liked to use CRTs in their devices because I came across a discussion to adapt the 4400 from 50TB1 to 2BP1 CRT, and there are more for sure.

Paolo

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