On Tue, 18 Aug 2015 22:05:16 +0200, Reinhard Zwirner wrote:

Hi,

there was an early ADC chipset manufactured by Mullard consisting of
FEY101, FEJ271 and 74141 ic's. While FEY101 is still available
FEJ271B seems to be unobtainium. Can someone here help me to get one
or two pieces? Many thanks in advance for your help.

Best regards

Reinhard

Could this be what you are looking for?
http://www.ebay.com/itm/FEJ271B-Semi...-/400742554651

Cheers!