[sdiy] vacuum tubes!!!

[Bob Weigel]

7247 is a mil spec 12DW7 I believe and I'm trying to recall what uses 
them.  They do find their way into audio stuff anyway.  6CB6 appears 
here and there but probably mostly tv circuits I have an idea.  The 8417 
is worth some money..used in dynaco and some other stuff I guess.  I 
just checked ebay and someone is getting 56 bucks for a pair with a day 
to go.  I'm not familiar with the rest at all but you can look them up 
on line.  They're in my book but I doubt any of them are too valuable -Bob

Michael Ruberto wrote:

> how bizarre, an aquaintance just dropped off a milk crate of 
> electronic parts for me. in the crate were some dual concentric 1 Meg 
> pots with switches, some DB25 female connectors, a technicians 
> assortment of electrolytic caps and.... dozens of vacuum tubes!! help 
> me out here. I'm not a tube guy so I don't know what I'm looking at. I 
> can't tell if they are new or used, my friend says there's both. 
> here's some numbers:
>
> 6KM6
> 6EN4
> 6GH8A
> 8417
> 12GN7A
> 3A3C/3AW3/3B2
> 6BS3A
> 6AQ5A/6HG5
> 7247
> 6CB6A-6CF6
> 6CW5/EL86
>
> Are these useful for audio apps? without a tester can I verify which 
> are still new and which are used?
>
> M. A. Ruberto
>
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