wc6w@juno.com wrote:
> Hi Tom,
> That '5106 is probably for Cable TV use and likely cuts off around 40 MHz
> (on the low end!).
>
> If I recall correctly, some of the general purpose units that go down to a
> MHz use numbers from CA28XX group. They come in both single ended and
> push-pull versions.
CA2820 and 2830 are good ones, 0.5-1W capability and only a couple of
power line decoupling caps needed. Motorola equilvalents are MHW590 and
592 - these replaced the TRW parts after Mot bought TRW. Many other
CA28** or MHW parts will also suit, but some need external chokes or
transformers. Beware the gain - around 30dB. If you're running about
1-200mW out for linearity, it means only -10dBm in (ideal if you build
your own exciter). If you're going to do that, you could consider going
the whole hog and incorporate polar or cartesian loop feedback.
> I've seen a few of the 350J's for sale on the web over the years. I don't
> believe the demand is very high for those as they have a 26V heater and as
> such can't be dropped into a 4CX250B socket. There is also the 4CX600J/JA/JB.
I'd bet that the 'FJ is barely different from a std '350 - just tested
for linearity under class A. They might be a few dB better than 'any
old' '350, but I'd be surprised if the difference was more than a few dB
- not 10 or more.
Steve
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