If you want an input-sensitivity of 0 dBm (0.775 mV), 1mWatt in 600 ohms,
which is standard, replace R11 with 12 Ohm. If you leave R11 in place the
input-sensitivity will be 0.5 Volt.
Step 5 – Replacing the output transistors (optional)
Remove the output transistors and the driver transistors. See the exploded
view as a reference. Make notes or pictures for reference information. Place
new silicon pads and reinstall all the components. Check with an ohm meter
there is no connection between the heat sink and the casings or metal parts of
the transistors. Check with an Ohm meter the contact between the case of the
transistor(s) and the corresponding tracks (marked by the transistor fastening
screws) on the copper side of the Pcb. The reading should be 0.1 ohm or
minimal reading depending on your Ohm meter (or DMM).
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