Mullard ZM1200 Pandicon available

[Roddy Scott]

I have been approached by the tube seller I used to do the Dekatron and Nixie deals with to see if I was interested in an NOS Mullard ZM1200 Pandicon that he has acquired.

It is a genuinely stamped Mullard item and has a sticker on it declaring it to be a development sample with no guarantees of further supply on the rear.

If anyone is interested in this pm me and I will give you details.

[Terry S]

Very beautiful tube.....

[Roddy Scott]

The seller has come back with a reasonable price for this to include shipping. VAT free to non-European countries.

PM if interested.

[Roddy Scott]

While waiting on this to be delivered I have searched out what available information I can find in regards to the ZM1200 Pandicon.

The developing company was Philips/Mullard consortium and it appeared labelled by both and Valvo who were pointed out as also being in the same consortium.

Finding data sheets from all 3 has not been a success as I can only find those from Philips dated 1970 on Dieter Wachter's extensive listings, much copied and displayed in other data sheet sites. There is also another data sheet dated 1969 for the Philips version elsewhere that I just found. (edit)

The development version seemed to have been produced in quite a large quantity at the time before the introduction of the production version with the differences being the mesh patterns, square in the development one and hexagonal in the production one. Development versions also had the label on the back of the tube stating that it was a development sample and that further supplies were not guaranteed.

Information from a collector states that the development versions had serial numbers etched or stamped on the rear plate and on the photos he posted the production version was white ink stamped with 'Philips ZM1200'. 

The tube I posted initially has 'Mullard, ZM1200, Made in Holland' white inked on the rear, I have seen a Valvo version with the white ink stamping and also a Philips one with a printed label on the rear. 

Examples of the smaller versions such as the ZM1206, has an 'Amperex, Made in Holland' label (photo), while a ZM1202 has Valvo ZM1202 white ink stamped on it as does a ZM1204. The Valvo stampings can be seen here on Udo Radtke's collection.

The rarity of the ZM12xx series make it difficult to get accurate information on them and any further info would be much appreciated.

Roddy

[Roddy Scott]

EDIT - Philips bought out Mullard in 1928 but still marketed tubes under the Mullard label - I should use Wikipedia more often! Valvo was a German company - Valvo started as Radio-Roehren-Fabrik GmbH (RRF GmbH) in 1924 as the vacuum tube manufactuing arm of C.H.F. Mueller GmbH which only produced X-ray tubes. The company was renamed Valvo in 1926. Phillips bought C.H.F. Mueller in 1927 and Valvo in 1932. The company was split in the 1980s and sold in 1999.

[Charles MacDonald]

On 2019-06-28 5:04 a.m., Roddy Scott wrote:
> EDIT - Philips bought out Mullard in 1928 but still marketed tubes under
> the Mullard label - I should use Wikipedia more often! Valvo was a
> German company

Philips was a company of many names. they had an internal system of
etch marks with a code for date, design and factory that made a given
tube. (not sure if the "specials" would get the full code.)

in each country they sold tubes they used the "local" name, like Mullard
generaly a firm they had bought over the years. So Amperex, Philips,
Miniwatt, Rogers, Pope, Mullard, and several others were all valid, and
often were applied by the local distributor.

https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf

is proably a good start

--
Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

[Roddy Scott]

Here are some detailed photos of the ZM1200 which arrived today. 

There is no documentation and the packaging is half of the original box with the foam liner breaking down, the tube is wrapped in old corrugated paper and tissue, the box looks as old as myself. 

The pins have age discolouration as would be expected.

The tube is sold as seen and was described as NOS although that is no guarantee that it is a working tube.

Unable to source the sockets for this tube as they are even rarer than the tube!

I have described this as best as I can and without prejudice.

[Tidak Ada]

An Development sample! That makes it a collector’s item !!

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