A simple way to reduce the power of your QRP set to milliwatt level, without modifying the set, is the use of attenuators.
The combination of 20 dB, 10 dB, 7 dB and 3 dB is fast to switch, when you want to increase your power in QSO's.
In one move, one attenuator section is switched OFF and an other is switched ON, to increase the power with a step of 3 db or 4 dB.
Last week the PA1B QRPp page was updated:
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PA1B Fast and accurate 40 dB Power Attenuators for QSO's.
Specially designed to use in QSO's with very low power.