[Amps] Tubes, made in the USA, in the olden days; Films?

[Roger]

On 8/30/2010 12:33 PM, Carl wrote:
> It runs out of steam above 20M and up plus it really should have some forced
> air when pushing at ICAS ratings, seal ratings are only 145*C.  Its a fine
> AM tube but rather useless in GG SSB as its pretty low gain.
>
And low dissipation.  Without forced air they rated at 300 Watts and are 
only good for 150 to 200 watts output per tube in class B.
> The audiophools like them also.
That's probably what pushed the price up to unrealistic levels.  Last 
spring IIRC they were fairly cheap. Now it's common to see them over $200.

73

Roger (K8RI)
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "Rob Atkinson"<ranchorobbo at gmail.com>
> To:<amps at contesting.com>
> Sent: Monday, August 30, 2010 12:02 PM
> Subject: [Amps] Tubes, made in the USA, in the olden days; Films?
>
>
>> 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.
>>
>> Rob
>> K5UJ
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