Old valves / tubes

Posted: 2/8/2011 2:24:04 PM
FredM

From: Eastleigh, Hampshire, U.K. ................................... Fred Mundell. ................................... Electronics Engineer. (Primarily Analogue) .. CV Synths 1974-1980 .. Theremin developer 2007 to present .. soon to be Developing / Trading as WaveCrafter.com . ...................................

Joined: 12/7/2007

I have just been given a big box of old tubes / valves - These were given to me through "Free Cycle" where people give things they do not need to those who can use them - The ethos is that the recipient either uses the 'gift' or passes it on to someone who can use it, or sells it ONLY for raising money for a good cause - not for personal profit.

These tubes were removed from equipment between 1940 and 1960, and have been in a loft in a cardboard box since 1960. I would guess that there are at least 100 tubes, probably more.

I plan to sort them into packs (5 to 10 tubes) and put these packs on Ebay, as 100% charity auctions (100% goes to Street kids Rescue (http://www.streetkidsrescue.org/) ) in the next month or so.

If you have any particular tubes you need for Theremin restoration or construction, please let me know - I will then put these aside if I find them when I sort the tubes.

The state of these tubes is not known - I was told that the owner had a tube tester.. and I am hoping that this tester turns up as the loft is cleared - if true, it is likely that the tubes were at least functional when put into storage.. otherwise a percentage of these tubes could be dead.

Fred
Posted: 2/8/2011 6:12:51 PM
Chainsaw Willie!

From: Just a short walk away from Nike Missile Site S-13/14

Joined: 1/28/2011

If the tube tester has also been stored since 1960 (or really anything over 15 years or so) it will need some refurbishing before use. These old monsters typically have large multi-section electolytic capacitor cans that dry up with age and get leaky. Sometimes the dielecric is so dryed up that they go from leaking DC to arcing over entirely and exploding. These cap cans are usually easily replaced by a group of modern individual electrolytics.
Posted: 2/9/2011 7:57:40 AM
FredM

From: Eastleigh, Hampshire, U.K. ................................... Fred Mundell. ................................... Electronics Engineer. (Primarily Analogue) .. CV Synths 1974-1980 .. Theremin developer 2007 to present .. soon to be Developing / Trading as WaveCrafter.com . ...................................

Joined: 12/7/2007

Thanks for the advice Willie..
It seems that this tester (if it existed) is not going to turn up.. A lot of old stuff was disposed of - makes me feel sick - it was only the tubes which someone thought might be of use.. Transformers, loudspeakers, chassis and all manner of 'junk' was taken to a recycling centre and dumped in the scrap metal skip!

I have been to the recycling centre in the hope of finding some of this stuff, but its all gone. It was probably only because there was no 'neat' way to dispose of the tubes (cant dump them in the glass bin, or in the metal bin) which saved them.

Aaarrrggghhh!

Fred.
Posted: 2/9/2011 9:57:41 AM
Jeff S

From: N.E. Ohio

Joined: 2/14/2005

Sorry to hear that. That's "progress". One man's junk is another man's treasure.

FWIW...here's the tube list for a couple of the more prominent tube theremins...

RCA AR-1264
(1) 80 (UX-280), (1) UX-120, (1) 24a (UY-224a), (3) 27 (UY-227), (2) 71a (UX-171a)

Keppinger
(1) 5Y3, (1) 6H6, (3) 6J5, (2) 6SN7, (2) 6V6, (1) OD3/VR150

But, I bet you already knew that.
Posted: 2/9/2011 2:07:15 PM
FredM

From: Eastleigh, Hampshire, U.K. ................................... Fred Mundell. ................................... Electronics Engineer. (Primarily Analogue) .. CV Synths 1974-1980 .. Theremin developer 2007 to present .. soon to be Developing / Trading as WaveCrafter.com . ...................................

Joined: 12/7/2007

[i]"But, I bet you already knew that" - Jeff [/i]

Nope! ;-) Tube numbers and their application in theremins are not 'stored' in my brain the way more modern components are - sure, I could go over the schematics and parts lists - but you have saved me this effort.. Thanks!

Back when I was 14, I had boxes of tubes (they were being dumped en-mass as solid state took over) - I had a tube tester, and I could afford to build kit from tubes from my pocket money.. (built an oscilloscope and basic synthesizer) The only transistors I could afford were salvaged from bistable boards of obsolete mainframe computers .. Silicon transistors were just appearing, and cost a fortune.. I dont know if this was due to living in South Africa and the restrictions alledgedly imposed on the aparthied regime.. but whatever - I had a few years of playing with tubes before I got a job at 16 working for Hamrad, which was the S.A. equivalent of RS Components - I then had access to semiconductor samples, and I left home and had to dump all my bulky valve stuff..

Apart from X-Ray tubes and photomultipliers, I have had little interaction with tubes for more than 40 years, and they are not 'instinctive' to me anymore - I have forgotten almost everything I knew about them.

Fred.
Posted: 2/9/2011 3:09:26 PM
Thierry

From: Colmar, France

Joined: 12/31/2007

I'd be interested in
- European ECC86,
- American 6GM8
- Russian 6N27P(6Н27П)
Posted: 2/9/2011 4:57:50 PM
FredM

From: Eastleigh, Hampshire, U.K. ................................... Fred Mundell. ................................... Electronics Engineer. (Primarily Analogue) .. CV Synths 1974-1980 .. Theremin developer 2007 to present .. soon to be Developing / Trading as WaveCrafter.com . ...................................

Joined: 12/7/2007

I will reserve some of these for you if I find them - ECC86 is a tube I think I have seen in the box - have mostly European tubes.. I doubt if there are any Russian ones, think there are some American ones.

Fred.
Posted: 2/10/2011 1:39:06 AM
Thierry

From: Colmar, France

Joined: 12/31/2007

Thank you in advance. In ever case all three tube types I cited above are equivalent.

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