Hacker RP 25 -Motorboating now now AM and high quiescent current

[Bonky]

Hi.
All the advice is exactly the way I'd be doing things.  
If you were not a beginner I'd also say you can check this with an un-modulated signal generator and DVM. The detector diode does a dual purpose, it demodulates the IF signal and you get two resultant end products. Audio and a DC component. If you have no modulated carrier from the signal generator you still will have the DC component so connecting your DVM to the detector diode and common or chassis when you apply the signal generator to sat T4 base there should be a small voltage on the diodes cathode. If you work back to T3 base the voltage should be higher due to having the amplification added to T4 from T3, the same goes for T2 if you apply the signal to its base.
If you want to try this there is a resistor (R14) 2.2k ohms, connect your positive lead from your DVM to its connection nearest the IF transformer, connect the negative lead of your DVM to the positive side of C21 350Uf electrolytic cap.
Like I say you should see an increasing positive voltage the further you go back, don't expect more than a few millivolts on the base of T4 though, more when on T3 and some more on T2.

The best option though is a signal generator with a modulated tone to make it easier.
Do you have a scope?

Thanks again for all the detail. I'll experiment in the morning and report back.

Sorry, no 'scope. Do I need one????

Thanks,

Richard.