[ARC5] Why "Noodling" About Sweep Tubes

[Jim Wiley]

The much better version of the venerable 829A, that fits the same socket 
and runs from the same voltages, is the 5894A (also known as the 
QQV06-40A and AX9003A).

Also inexpensive, because not many people know what they are, 
particularly when labeled using the European numbering system. Puts out 
more power than the 829B, mostly because it was designed from the ground 
up as a VHF dual power tetrode,  so it is a bit more efficient.

  I built a HF rig using one and got around 150 watts output, 160 thru 
10 meters.  Used another in a Johnson-Viking 6N2 and got an easy 110 
watts AM, 140 watts CW output. The 5894A works at full power up thru 180 
MHz and at reduced ratings thru 450 MHz.


- Jim, KL7CC


On 10/23/2013 6:21 PM, Kenneth G. Gordon wrote:
> 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