[Boatanchors] WE 407 and 408 tubes

[Al Klase]

Bill,

Bookmark Frank's Electron Tube Data Sheets: 
http://www.mif.pg.gda.pl/homepages/frank/vs.html

For example: http://www.mif.pg.gda.pl/homepages/frank/sheets/127/4/407A.pdf

The key here is "carrier telephone system."  Bizarre heater voltage 
etc.  'Phone Company Stuff.

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 6/11/2016 9:28 PM, Bill Cromwell wrote:
> Hi,
>
> I found a 407A and a 408A vacuum tube (also known as valves) lurking 
> in my stash. These tubes seem to have some special or magical 
> characteristics. Can somebody tell me about their special virtues? 
> They seem to focus on VHF. I get nosebleeds starting at 21 mc so VHF 
> tubes are not so special to me (even though I have others that work at 
> VHF).
>
> If it turns out that I don't need them and no audiophile offers a 
> fortune (WE ye know) Do any of you need them to get your radio back on 
> the air? I have one of each.
>
> 73,
>
> Bill  KU8H
>