[TenTec] Corsair II weak weak receive

[jon greenwood]

Hope some of the good troubleshooters on here can point me in a direction. I have a Corsair 2 that is very weak on receive. I have checked transistor voltages on IF/AF board 80984, the Osc/mixer board 80975, and the RX mixer board 80987. All seem good or very close to specs in manual, except Q6 on RX mixer 80987.
 I am reading 11.5 volts on base emitter and collector in receive mode. In Transmit these all read correctly base emitter and collector zero volts. I replaced the 270pf cap C24 as well as C25 5-25pf variable cap. No change. I removed the Q6 transistor and the radio receives exactly the same. I replaced with a new transistor with no change. So my thought is a bad  a component around Q6 but at this point I am stumped on what it is. I also checked D7 and D8 pulling them off the board and just checking with my ohm meter. Flow in only one direction on each so they seem good.
 Any thoughts/ test procedures would be much appreciated. I have a 100mhz digital scope and an older Fluke DMM that I have to work with. Questions/Thoughts? Jon N8MUS