So maybe the Hercules can be converted to use MOSFETs. Seems like it should be
possible.
I also think MFJ needs some competition on MOSFET linear amplifiers to get the
price point within reach of the average ham.
There is just not a good reason why so many linear amplifiers should cost $3500
to $9500 when you look at the parts cost and manufacturing cost.
[/SOAPBOX]
Best regards - Bry Carling
> On Aug 9, 2014, at 5:24 PM, Douglas <sparks06524@yahoo.com> wrote:
>
>
> Date: Sat, 9 Aug 2014 10:12:45 -0400
> From: Brian Carling <bcarling@cfl.rr.com>
> To: "k9yc@arrl.net" <k9yc@arrl.net>,
> Discussion of Ten-Tec Equipment
> <tentec@contesting.com>
> Subject: Re: [TenTec] Hercules 444 amp
> Message-ID: <86F80EE5-1044-42AA-9641-D8859123467B@cfl.rr.com>
> Content-Type: text/plain;
> charset=us-ascii
>
> Seems like a lot of RF power transistors are similar, so it
> should not be too difficult to find a substitute.
>
> Best regards - Bry Carling
>
> ------------------------------------------------------------
>
> Ah - but it is hard to find a substitute. The Ten-Tec factory can't find one.
>
> There were only a few designs of 250 to 300 watt 50V bi-polar power
> transistors made. The remaining ones are hard to get and have an HFE that is
> too high. Several such transistors have been totally discontinued. Motorola
> for example is out of that business. M/AComm bought some of their designs but
> in general bi-polar RF transistors are considered passe. RF MOSFETS are now
> the name of the game.
>
> Per another poster: I've not had trouble with the power supply drifting
> upward with temperature rise. Perhaps they solved that with compensation.
>
> 73,
>
> Doug/WA1TUT
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