Philips 74HCT112 in 16 pin DIL package are available from a UK seller on eBay at ?2.99 plus 40p postage, not anyone I have bought from but I don't think I have had any dead or fake parts from UK sellers offering almost immediate delivery (2-3 days). Also in 16 pin DIL from France, six for 10 Euros, Texas Instruments, delivery in a couple of days so shouldn't be direct from China.
I also measured the output of a 50MHz can oscillator in 8 pin outline that I happened to have to hand. About 4.4V pk-pk with a 390R resistor either to ground or to Vcc. I thought the latter was a better match to sinking the TTL input currents.
Roger
