[TenTec] Resurrecting Hercules 444 amp

Mike Bryce prosolar at sssnet.com
Thu Oct 18 15:28:54 EDT 2012

I am going to take a stab at this but I'll admit I've need had my fingers in one. 

First I'd see in in fact your drawing enough current to light the IV lamp. 

If you are, then place a AM broadcast receiver near the pa modules. Key the amp with drive. 

If the AM radio sounds like someone is trying to blow dry a wet cat, then the amp has some low freq oscillations. 

(Btw... A spectrum analyzer would be nice to have instead of the wet cat.)

Could also be bad/loose/fubar band filters/switch

Mike wb8vge

Sent from my iPhone

On Oct 18, 2012, at 2:37 PM, Pat Moore <pmoore44 at gmail.com> wrote:

> I was given a Hercules 444 amp, and I have it working on 160, 40, 20, and
> 15. However, on 80 M, the I/V light comes on with any more than 10 watts of
> drive. The amp is stable and produces rated power on the other three bands.
> Any ideas why there's a difference on 80?
> I know TenTec abandoned this amp when the transistors became unavailable,
> but mine still works, and I'd like to get some use out of it.
> Tnx ex 73 de AL7L
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