[Milsurplus] Why "Noodling" About Sweep Tubes?

[COURYHOUSE at aol.com]

vt 4c  unreal  I  remember in the old  days  of  buying a box of them  for 
$10!
 
 
In a message dated 10/23/2013 12:51:59 P.M. US Mountain Standard Tim,  
quixote2 at ix.netcom.com writes:

Another  possibility here...  Have you considered the Russian GM70  triode?

They too are starting to climb in price, but they're STILL a  hell of 
a lot cheaper than 211s.


Mr. T. W9LBB


At  05:36 22-10-13, David Stinson wrote:
>Some people have asked why I'm  thinking about sweep tubes and the 
>BC-375. I do use 211s in my  personal rig. However, there are a lot 
>of 375s sitting around because  211s have become so expensive. The 
>least expensive I've seen are the  Sino chinese, which are going 
>about $75 each. $300 to get the old  beast going is too much to ask 
>for most people.
>Worse- I  finally got around to testing the big stash of 211 tubes
>I've been  accumulating for years. Much more than half of them
>were bad- most from  gas. Of the few that remain, some are 
>low-emisson and will work only  in the oscillator stage.
>This much-reduced stash is going to have to  last, since 211 prices 
>aren't likely to come down.
>So I'm  trying to find an affordable substitute, not only to "stretch"
>my tube  supply, but in hopes we can get some of those 375s
>off the garage floor  and back among the living.
>Sweep tubes with less-popular filament  voltages, like between 10-14,
>are not nearly as expensive. They are  good for high voltages and currents.
>But I don't know enough about them  to "narrow the field."
>Thus, my appeal to the group's wisdom and  experience.
>
>Did something similar to this with the SCR-183  tranmitters-
>another one that is too expensive for most to use original  tubes.
>Mounted some little audio pentodes (triode connected) in socket  adaptors
>and it worked well. Hoping for similar success with the  375.
>73 DE Dave  AB5S
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