[600MRG] Capacitors

[Larry]

While trying to build good bandpass filters for our favorite 
frequencies, I've had a great deal of difficulty finding capacitors that 
are good enough. C values in the range of 0.0047 to 0.1 uF are required 
for most of these filters. All of the capacitors I have on hand in this 
value range seem to be extremely low Q, very high ESR.

Does anyone know of a source of known good capacitors in this range? 
I've looked at some WIMA and Kemet pulse rated caps and while they seem 
to be better than most, they are still not good enough to build bandpass 
filters with.

Thanks & 73,

Larry - W7IUV / WH2XGP