SIGH - My Bad...
You don't leave TR17 in circuit, you're simply looking for signal to arrive to the base. (A DC Voltage) I am approaching this as if I would have a "dead transistor" I need to check "Bias voltages" to make sure the part I put in will survive as well as function.
That would be fine if I didn't have a brain fart...
And I see I meant "Emitter" when it comes to signal - now I know where you got confused - this is a common base design - meaning that it acts more like a simple current follower than an amplifier. You don't need gain, just power - this helps it's selectivity - too much gain can overload TR18.
The Base - see above, taps from the arriving 8 volts available at the COLLECTOR side (L7)
Sorry about that...
Then if a signal is arriving to the EMITTER, then we can rule out any relative problems with the path the RF takes to get there.
I didn't have a V8 this morning...
BELOW is another configuration used in Cobra and Uniden early models...
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This is a Common EMITTER design - BASE has SIGNAL
If it were me, I'd do the same thing remove the part and test it out of circuit.
Check voltages at where the leads would go - VERIFY that the part I put back in there won't go bad like the other one.
Remember we are trying to find out why TR17 isn't working - let's make sure the part isn't the problem, the way it's put in, is it Blown or shorted out due to ANOTHER voltage problem the board has...
