Got a TRC-485 anywhere?
[ATTACH=full]43447[/ATTACH]
They Glued their MV-1Y clones to the BODY of the part, then soldered the wires underneath to the Bias feeds.
No, I said that right - they soldered the Diodes UNBANDED side - to the Bias supply voltage - thru a Resistor/Bead for the DRIVER on the Left, and fed the FINAL thru a Green bodied Choke, with a ferrite bead choke (2X the choke) on the FINAL - on the right.
The BANDED side went to RF ground so they followed the Emitter leg down and soldered to it's pad on the main PCB.
Each transistor had an individual lead to the Bias voltage - not thru the Base lead - just met there thru the jumpers and the Chokes, the Diodes never get close to the Base lead or it's input signal..
So they buffered and choked off RF from returning back into the Bias diodes and altering the Class - but they Glued the Bias Diodes directly to the body of the Transistor.
You were forced to install new diodes every time...
In another thread, the above heat sink mounting hardware insulator - note the PVC and the "Curl" in one - this is a dangerous moment - for as these thing heat up, they expand and those insulators try to transfer the heat away but as that happens the expansion and contraction of all the components involved - it's gets toasted - Radio Shack - we got dinged for that every time one was returned.
