The board it can hold - can go a lot more channels - sorry for the "extra data".
So ok, the TP3 If seems "low" - but is not deviated 455kHz like you'd have something missing.
So you have to turn down (load up) The Clarifier to even get the thing to slide down low enough - still leads me to the bunny hole of the Clarifier.
To bring the frequency down - you have to ADD voltage to force the capacitive barrier of the Varactor up in value - slowing down that tank oscillator
But you say the voltage doesn't change (you can rotate thru the range but it seems high - 8 V is a bit much) you list two white wires, one of these white wires is correctly working 4.5 to as high as 6V - which is the working range of the Varactor it goes to. So one of these wires is working right.
When you located this wire - did you do a TX to RX switchover to observe this on the Clarifier output (Wiper arm)? A small rise / fall - even 0.4V (4 tenths of a volt) can indicate there is a problem.
So if the Clarifier is "stock" the TX side receives power thru D63 in TX mode, but in RX mode R115 and D41 - are in play - so if I'm not getting this right - I'll need to see a pic of the board to make sure I'm guiding you right.
So I'd locate R115, it's a 47 ohm, usually right near the Front panel - by header J10.
Since this board is capable of a lot of stuff that can get us jailed in certain countries, they put jumpers in spots that add to the WTF moments when tracking down this issue.
What you need to check - is both sides of this resistor in RX - then in TX mode.
Why? A hunch the Clarifier is wired wrong or the "steering diode" D41 - may be shorted - LOADING the TX line - leaving you to tune one direction - while the RX mode supplies power correctly, but in TX - it pulls off power in the other direction trying to power RX - but when you get RX to work there - something isn't right.
IT could also mean the wiring on the pot is wrong - or a jumper is not set right.
We're not done here, the same line that feeds that R115 (RX power) also goes to the RF Gain control. So if you're having Receive issues, the RX power line might be getting pulled down by something ON the line to this section.
If I'm rambling - let me know I'll stop so others can come in here and help you figure out this mess.
