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.
>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.
73 Carl KM1H
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