On 8/30/2010 12:46 PM, Patrick Barthelow wrote:
> The 833s I saw years ago in their transmitter cabinets, at an AM broadcast
> station had no chimneys or ducts to cool them just a lot of
> general blower air around them. The mounts were also very simple....two huge
> Filament pins on the bottom, and two large pins one Plate, and the other
> grid on the top of the tube. Would be easy to mount for a ham amp but the
> problem is a huge plate capacitance, which limits their upper practical limit
> in ham service to maybe 40 meters as I recall. They would be a cheap killer
> solution to a
> 160 amp.
Cheap? Have you seen what they are going for lately? As for pulls I
doubt there are many still in use.
The price increase is worse than "black plate" 6L6s.
73
Roger (K8RI)
> Probably had as pulls for cheap from AM broadcast stations that used to us
> them.
>
> Best Regards,
> 73, de Pat Barthelow AA6EG
>
>> Date: Mon, 30 Aug 2010 11:10:58 -0500
>> From: mikea@mikea.ath.cx
>> To: amps@contesting.com
>> Subject: Re: [Amps] Tubes, made in the USA, in the olden days; Films?
>>
>> On Mon, Aug 30, 2010 at 11:02:21AM -0500, Rob Atkinson wrote:
>>> I don't have the spec. sheet right in front of me but I recall the 833
>>> could put out a hell of a lot of power with no forced air cooling.
>>> 600 w. (but I forget what biasing) sticks in my mind but don't hold me
>>> to that. Whatever it was, it was very high and made me wonder why it
>>> is not used in ham amps for all these operators who are obsessed with
>>> not having any blower noise. My guess was supply, cost of the tube,
>>> and the (for hams) unconventional way they are mounted.
>> Add that they're not good in linear service (think Class-C), as I
>> understand it. They _are_ most interesting in appearance.
>>
>> --
>> Mike Andrews, W5EGO
>> mikea@mikea.ath.cx
>> Tired old sysadmin
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