[Boatanchors] Why "Noodling" About Sweep Tubes?

[Bry Carling]

I would guess the a quad set of 805s would be a nice substitute ... Bright emitter valves with plenty of oomph and the classic look. Actually 813s might be easier to find and often run about $25 to $35 each at hamfests. Sometimes even less.

Bry Carling
http://af4k.com

> On Oct 22, 2013, at 6:36 AM, "David Stinson" <arc5 at ix.netcom.com> 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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