[Amps] Dentron MLA2500

[rees.a@btconnect.com]

Hi
I have a Dentron MLA2500 Linear. I use an Icom 756PROII as the main rig. 

I discovered a problem the Dentron MLA2500 amp. On 3.5MHz my 756proii won't
auto tune to the input of the amp, therefore shuts off the drive. The
reason being is that the 756 "sees" a high SWR. 

(All other bands work FB) 

I lifted the covers off, to discover the 100 Ohm swamping resistor had come
loose (dry joint..age whatever) so I soldered it back on. 

No improvement at all.

Looking at the circuit diagram of the Dentron , there is no tuned input
stage to the amp.
I am somewhat befuddled by this. Any ideas ?

By the way, all the tests where into a 2Kw Oil filled dummy load, with an
SWR of 1.1:1.
(Switching the amp to Standby (by passing the amplifier, and direct to the
dummy load, and the 756 tunes OK, as you would expect).

Thanks

Adrian Rees (M1LCR)

PS I have another Dentron ML 2500 Amp, that is FB, but doesn't cover 28MHz,
I believe it was made for the US Home market ? Any info about thhis
appreciated.
 


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