Product review (5 stars): works great in ge profile over-range microwave
Our GE Profile microwave oven JVM1870WF06 had a buzzing sound and stopped making heat.  I watched many you-tube videos about how to open the microwave oven and disassemble.  I'm pretty handy and work with microelectronics, but was not experienced with this type of appliance repair.  Once it was open, I found the magnetron ("mag tube") was shorted across the filament which is quite rare (approx 0 ohm cross F and FA terminals, but no short of either terminal to mag chassis) so I was a little skeptical.  The original part was a Samsung 0MP75 (10) (or is it OMP75 ?)  which I found on-line, but after talking with a local repair shop, he recommended the QBP brand saying it last's longer than the original Samsung part.  He wanted $90 for the part, so I chose to buy this one.

The picture is wrong for this part, the terminals are the single oval connector, not two separate ones as shown.  I ordered it with free shipping, which took a few days.  when it arrived it was double packed (box in a box) and was in good condition.  I installed the part in about 30 minutes and tested it, and it works great.  I also replaced the round diode (GE part number WB27X10817 now subst. with WB27X10597) on advice from various you-tube videos, and was hoping that was the problem.  The diode replacement (done first, a week before the mag tube) did not solve the problem, but I'm glad I put a new one in anyway.

I would recommend this part and this seller.  Most of all, my wife is happy to have a working microwave again and is amazed it was this easy to fix.