>
>
>
>On Wed, 24 Feb 1999 01:00:57 -0800 (PST) john merryman
><andy_m_99@yahoo.com> writes:
>>
>>
>>
>>Am i missing something about the YC156.
>
>Yes you are....
>
>>It has 5k plate dissipation,
>>its rated for pulse use.
>
>Not completely correct. The YC-156 is a selected version of the
>3CPX5000A7. It is selected for high emission and excellent linearity for
>medical use.
>
>
>>What would be the realistic operating
>>parameters in SSB, to stay within the plate dissipation of 5K. You
>>end up with a tube that is similar to a 3cx3000 output wise, with a
>>very poor 3rd order imd figure. The data sheet does not mention any
>>high linearity figures, is this urban myth?
>
>Use the 3CX15000B7 for curves since the YC156 uses those internals.
>
>
>>I think the 8171 in class A would be more linear and have a better IMD
figure.
>
>Arguable. The YC-156 has so much extra reserve emission even when run at
>the 5KW dissipation level.
>Third order IMD in the > -45dB range are reported in ham SSB service.
? Sounds reasonable. Which ham transceiver has <45db 3rd order IMD?
>
>
>
>>The 8171 would also have more grunt.
>
>For CBers and CB style hams.
>
? _______
>>But i might be missing the point of this tube. Please explain why this tube
would be
>>favoured?
>
>Cheap, available, no socket required, reasonable filament requirements.
>Can run legal limit RTTY at modest Ep. For a low investment it can be
>the basis of an amp that will last darn near a lifetime.
>
? One of the flies in the ointment is that the substantial amount of
C-out does not facilitate reduced anode-current operation on 10m. . In
other words, in other words one needs several hundred watts of drive to
make it come alive. . Another fly is the lengthy preheat time
- cheers, Carl.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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