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Gents
One would have to look at all the gory details to nail this down but I am
willing to bet that the 75 MHz amp for the Tektronix scope was a distributed
amplifier. The tubes is such an animal are not in parallel. Rather, they
provide the C's for individual cascaded L/C sections of an artificial
transmission line(actually there are two lines; one for the input and one for
the output combining function). A similar thing is done with todays GaAs
Linear microcircuits that realize very broadband amplifiers; eg, 2 to 20 GHz.
Dan K9EA
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Message-Id: <200104230037.f3N0b0W20975@contesting.com>
Subject: RE: [AMPS] 4CX350A
To: <amps@contesting.com>
Date: Sun, 22 Apr 2001 17:37:09 -0700
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>Have you seen those ten tubes in parallel on 50 Mhz?
They were used as the broadband 75MHz vertical amplifier in a Tektronix
oscilloscope.
cheers, George
>
>-----Original Message-----
>From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On Behalf
>Of measures
>Sent: Sunday, April 22, 2001 9:34 AM
>To: gclute@home.com; AMPS
>Subject: Re: [AMPS] 4CX350A
>
>
>>
>>Would it be practical to put (3) 4CX350A's in parallel, or would the plate
>>capacitance be too great to resonate on 75 thru 6 meters.
>>Has anyone out there accomplished this feat?
>>
>I have seen as many as 10 tubes in parallel. C is not much of an issue
>because each tube that is added means more C-tune is needed.
>>
>cheers
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>end
>
>
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>
- Rich..., 805.386.3734, www.vcnet.com/measures.
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