Increqsing the gain of the Pleiades 2 K117 microphone preamplifier

At your risk.It is a 2 JFET microphone preamplifier, mic feeding the input transformer and 2nd JFet feeding the output transformer which feeds for example the Sennheiser Hd580 headphones. Vb has been changed to a 9 Volt battery. Load resistor of first stage has been changed to 100Kohm, and of 2nd stage to 22Kohm. Now gain is very high and the 2nd stage clips. There is again FM radio reception, floating wire picking up RF etc. Maby a potentiometer should be connected between the 2 stages to attenuate what the 2nd JFET gets from the 1st. Also to check if the whole thing does not oscillate.