MX P50M 50 Watt HF Linear Amplifier.
I am selling the amp simply because I could not get it to work with my Xiegu GM1 5W HF qrp rig that I also sold last year. This is almost certainly due to my inexperience, having only very recently come onto the HF bands.
I looked up all the info and in my photos is Dan W7RF's "chapter and verse" on how to get the non-sensing MX P50M into transmit using the its special trigger line. This works simply by needing to be grounded somehow on transmit.
The linear for sale is actually a replacement from the main MX P50M UK importer after my returning the first one as "faulty" when it probably wasn't!
As you can see from my photos ( including one of the circuit board) the linear is still in "as new" condition and powers up normally with all bands lighting on the selector switch. I carefully retained the original power and TX trigger leads and connectors ( see photo) so my guess is that a more experienced operator will get it to work. But sold on a "spares or repair" basis.
Postage:- UK Second Class £3-50, Europe tracked airmail £9, rest of world £14. The amp will be carefully packed in a strong new box with plenty of soft infill.
Please note - payment or contact is required from the winning bidder within 24 hours of the auction end ending or the sale may be cancelled
Dimensions length 175mm, width 100mm, height 40mm. Weight 520g.
JUST RECEIVED FROM A KIND EBAYER - " BY THE PICTURE IT LOOKS LIKE YOU OVERLOADED THE POWER TRANSISTOR". MY PHOTO JUST ADDED APPEARS TO CONFIRM THIS - SEE DISCOLOURED RESISTOR ETC. (SIMPLE FIX MAYBE?).
UPDATE - From Youtuber "The Old Tech Guy KB9RLW" power module should be a Motorola MRF 186. Checking eBay I see these for around $20/£18 new. He also says trigger wires need to be closed to transmit.