LM394CH Supermatched transistor pair NPN, metal can by National Semiconductor, NOS. I've managed to obtain a quantity of these obsolete and rare devices from a local college electronic engineering dept. which has closed. Unlike the many fake devices being offered on certain internet auction sites, these are unused 'new old stock' and are original and genuine parts. Used in many analogue synthesizer VCO designs and useful for any synth DIYers. Price is for ONE piece. Free shipping for U.K - standard shipping for rest of world.