Haltron CV8067

I just added a CV8067 to the site. This is one of a number of Haltron valves I have noticed recently on eBay where the valve just carries the CV number. All those I have noticed are in the CV8xxx range.

Now K1001 does permit this but specifically when it is “impractical, on account of physical limitations” – see here (pdf) section 4.1.4. It is hard to see how a valve such as this example could not carry the full CV information. On on a subminiature valve, but not here.

The valve came in a Haltron box with no markings, and a label attached giving the CV and NSN numbers.

Looking at the valve the printing is slightly different too, as if the original Haltron marking is the original and the CV number added later. There is no obvious evidence of the civilian part number being removed, but of course it may just have been cleaned off sufficiently well as to leave no trace.

CV1475-78

Another little sequence completed – I now have all four magnetrons from CV1475 to CV1478. These are four frequency variants and successors to CV69A-D.

I have CV69A and D too, so now need CV69B and CV69C to complete that set.

There are two other sets of four – CV1479-82 which I have already and are CV76A-D (I have CV76B and C, so need A and D, and CV1483 to 87 which are CV99A-D. I am missing CV1483, and CV99B and D.

 

CV1931 update

For some time I had a CV1931 on the website, the example being a 6H6 metal double diode, though not 6H6 marked. Today I got a glass CV1931, also marked 6H6GT. I never checked before but the metal one is clearly incorrectly marked.

The CV Register has three CVs in a  series: CV1929 / 6H6G, CV1930 / 6H6 and CV1931 / 6H6GT. This makes sense.

For now I’ve left the page as-was but added the glass valve.

 

Removed valves

I have been trimming the collection for some time now and disposing of valves which helps maintain this virtual museum and also reduces the amount of storage space needed. It also helped me finally focus on what I want to collect, rather than just anything and everything.

But someone mentioned to me a whole back that people may still want to see these. As the main pages only display what I actually own, once removed a valve’s web page is removed too.

So I have been making PDFs of the more unusual valves as I remove them and these are now held at http://vacuumtube.info/oldvalves/ – it is simply an automatically generated list of PDF documents, each one of which is basically the valve page saved as a PDF via Safari.

Update – about this WordPress

I have been using WordPress recently to drive parts of the website and also to record new exhibits and so on. However, this has the drawback that every time the home page was called it would also call WordPress. Although this is common practice there is really no need for the simple text entries involved. I have now written scripts and modified the database to handle this without needing WordPress.

The content in here remains valid for now but will be removed once I am sure it has all been copied across correctly. After that, I will probably keep this here as a general blog, which is, after all what WordPress is good at.

The German collection

My thinning of the German collection is under way with some having gone onto my disposals page and others onto eBay or into a crate ready for the next local sale in November. This section of the collection can be seen here. Not all of the valves will go, the two Gema valves and the RD4Ma for example will most likely be staying here.

The Russians are leaving

After a lot of thought I have decided that the Russian valves in the collection are to go. There are some quite fascinating types there, and thousands that I don’t have. While I have a few I’ll always want others and this is no longer the way I plan to expand my collection.

The collection of old had four themes: CV and military stuff; German; Russian; and then everything else. I got over the ‘everything else’ business a while ago when I originally decided to concentrate more on CV and British military types. But I carried on expanding the Russian and German collections. I will find some way to preserve the more interesting or unusual pages somewhere before I remove them from the website.

I am undecided about the German valves but I suspect these will also go. Some are quite rare. Any Russian / German valve collectors out there?

The Russians are now all removed and the Germans can be seen here