Not exactly HBR, but it is for a companion transmitter. I am in need of a 15pf differential capacitor as used in many balanced modulator circuits. The diagram calls for a Johnson 160-308 but I am not fussy. I have all kinds of other capacitors to trade including some butterfly types. Or as a last resort willing to pay cash. Anything in the Junk box? Tnx es 73 Lorne VE7BOX