[ARC5] Why "Noodling" About Sweep Tubes

[Kenneth G. Gordon]

On 23 Oct 2013 at 18:36, Dennis Monticelli wrote:

> I just remembered another tube. The 829B was very expensive in the WW2 era but it's practically 
> free at the hamfests now. You find them mil grade NIB. I don't think I paid more than $2 for mine. 
> You can parallel the two tetrode sections or use them push-pull. I think they're good for 40W 
> plate per section. 12V heaters and a 7 pin socket (Septar?) that is worth more than the tube.

The 829B is one of my favorite tubes. The pulse version is the 3E29. I buy them as often as I 
see them for under $5 each. They will output something like 100 watts at 2 meters.

They are, essentially, a pair of 807s in one envelope with far shorter interconnecting leads, 
and reduced plate dissipation rating since you can't really have 70 watts PD in that small an 
envelope.

They make a magnificent push-pull oscillator in addition to being an excellent push-pull amp.

Ken W7EKB