This does sound easy enough - to make the attenuator attenuate more, although it looks to me that there's a very happy frequency that this amp wants to operate, which implies that somewhere, this frequency of 10 Mhz is being set by a certain combination of components - capacitors, inductors, etc?
Could it be C2 or C3? And I don't know about changing the number of turns on T1, but maybe? I could experiment with a few things I guess.? Any suggestions for starting points from the crowd? I've attached the schematic for convenience.?
Andy KA1PLU
