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.
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.
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.
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.
The CV5403 page has been updated because the TWT came with a test results sheet with more data that I had available from the EEV catalogue.
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.
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
I finally got round to ordering the valve list such that searches come out in a better order, for example searching on cv*. In a way it’s a bit of a cheat because to do in in SQL was getting very complicated and so I wrote a script which orders the index and writes an index number which SQL then sorts on.
It’s not perfect – valves which being CVX end up at the end of the CV list rather than where they should be numerically – but it’s a lot better than it was.
Someone asked me if I could have a section for valves which I have disposed of. I am not yet sure what the best way to do this would be because once a valve goes it’s database entry goes which wipes it from the website. This website has always been about my physical collection, not just a set of photos. (well, ok, it is really just a set of photos but you know what I mean)
Saving images of ex-valves is straightforward but it would just be a pile of pictures, no index or text. I have experimented with converting web pages to PDFs so I only need to store the one file. Other than that I’m not sure what method will fit with the overall site yet.
On the plus side, once I trim the current collection to just the CVs and military types as planned there should then be no further deletions.
After many years the RD150YB, my huge and heavy transmitting triode, and the 150/6G Mercury Arc Rectifier are destined for a new home. As part of my shrinking of the collection, these two have really got to go. It will be a shame to part with them, but then over the years they have just sat in the corner of the garage, the triode in its huge crate and the MAR on a shelf above, covered by a door for safety purposes. If I ever need to move the collection, these two would be left behind. I am keeping the CATs, so I still have the CAT10 but as that has had an abusive life I don’t mind transporting it on its side – the RD150YB has spent its life sitting upright in its crate and needs to remain so such that the filament and grid assembly does not bend under their own weight.
So, if you want to see the pics of these two, hurry as those will be removed once the valves leave here.
Recently some other old favourites departed here, including the MT9L and SAL-39 and TAL12/35. All have gone to new, caring homes!