On 15-07-13 08:48 AM, Andy Tefft wrote:
This is slightly off-topic but I knew some of you would have knowledge
and interest :-)
I rescued some tubes from a couple of old (40's and 50's) radios that
were getting the crowbar treatment (although I started to, that story is
too sad to recount). One of them surprised me by having a magic eye
tube, which I've never seen in person, which is what prompted me to pull
out all the tubes I could. Wish I'd had time to salvage sockets as well.
The 6E5 is a very popular tube, although as has already been said they
often get dim with age. This data sheet has some information and sample
circuits. Basically the tube acts like a small voltmeter with very low
effect on the voltage it is indicating. Besides radio tuning you will
often find them in Capacitor testers.
http://frank.pocnet.net/sheets/021/6/6E5.pdf
and a slightly different sheet
http://frank.pocnet.net/sheets/049/6/6E5.pdf
and this older one which going into a bit more detail
http://frank.pocnet.net/sheets/201/6/6E5.pdf
What I do know is that I'd rather have them get used than end up in a
dumpster. Is there any value at all in salvaged tubes? I think the magic
eye is a 6e5 type (I don't have them with me and haven't made a list
yet). Anyone seen a decent kit I can plug this into that will just do
"something"?
Hard to tell as the 6E5 was used in a LOT of different radio designs, so
the rest of the tubes can be many different types for a 30 year
technology span. all we can say for sure is you could probably build a
radio. (or a audio amp using the two or three tubes from the speaker
driving part.)
Too bad about the radios. Any that would have a eye tube were probably
higher end units and worth considering restoring, unless waterlogged or
similar.
--
Charles MacDonald Stittsville Ontario
[email protected] Just Beyond the Fringe
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