Palomar Magnum 6000 Original Gray Face

[Ranch55]

Palomar Magnum 6000 Original Gray Face.......
I need schematic for this amplifier.
Some one has removed the RF sensing keying circuit .....
I could also use some detailed photos showing location of keying circuit components.

 

[2NC995]

Nice amps. Hope you get it sorted out.

 

[Ranch55]

Well, I finally did get this amplifier operating satisfactorily. It came to me operating with only 75 watts output.
All 4 of the Toshiba 2SC2879 transistors were good and still had a high gain value.
I redesigned the input circuitry extensively, and the output circuitry somewhat.
I kept the regulated bias circuitry intact, as it works very well.
Input and output tuning turned out very well also.
Using my 4 watt low drive radio, with 20~23 watts PEP, amplifier output peaks at over 430 watts.
I am satisfied with the performance and will be shipping it back to the owner by the end of this week.

 

[Dr_DX]

Palomar Magnum 6000 Original Gray Face.......
I need schematic for this amplifier.
Some one has removed the RF sensing keying circuit .....
I could also use some detailed photos showing location of keying circuit components.

Hopefully better late than never.

 

[Dr_DX]

Some pics. The RF sensing circuit is in the bottom left hand corner. I installed a keying line by simply running a wire from the emitter of the keying transistor to an external 3.5mm jack ( you can see it on the back of the amp). When grounded (common ground) , it will key the amp. I prefer this over using the RF sniffer so no relay chatter on SSB and no RX delay after unkeying. Also added a fan.

 

[Dr_DX]

It came to me operating with only 75 watts output.

The amp can be set for 3 levels of input power - Low, Medium, and High. It has internal low and high drive jumpers.

Low drive = Low drive jumper C, High drive jumper NC
Medium drive = Low drive jumper NC, High drive jumper NC
High Drive = Low drive jumper NC, High drive jumper C

Maybe it was set for high drive?