[ARC5] Why "Noodling" About Sweep Tubes

[K5MYJ]

You can run the 829/3E29 at 120W PEP on SSB because the duty cycle is so 
low.

I use them for 2M linear.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "Dennis Monticelli" <dennis.monticelli at gmail.com>
Cc: <Arc5 at mailman.qth.net>
Sent: Wednesday, October 23, 2013 7:21 PM
Subject: Re: [ARC5] Why "Noodling" About Sweep Tubes


> 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
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