[TenTec] Hercules 444 amp

[Brian Carling]

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



> On Aug 9, 2014, at 8:56 AM, Jim Brown <k9yc at audiosystemsgroup.com> wrote:
> 
>> On 8/9/2014 12:37 AM, Douglas via TenTec wrote:
>> Has anyone figured out a substitute for the final transistors in the original Hercules amp?
> 
> You might ask on the amps reflector. I suspect the answer is still no. I owned one of these amps for a few years and sold it. The original story, as I heard it, is that Motorola learned that the output transistors had  problem, and discontinued them.
> 
> The power supply also has a temperature stability problem that causes Vcc to rise, which in turn causes it to go into self protect mode as it warms up. I decided to fix mine with a fan on the power supply. :)
> 
> 73, Jim K9YC
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