You'd be surprised. I have one of the oldest TNCs in the world (pre-TAPR :-) and I can still find parts for it - and for many old radios in that era - eBay is a very useful tool - good luck! BTW - what you may be looking for is an MC145406. - Richard, VE7CVS On 1/30/17 8:03 PM, Mark Phillips wrote:

PACCom did not put protection for reverse polarity on their units. you can try and contact them, but they dont make anything for the ham market anymore. They are really nice people. Lin http://www.paccomminc.com/ On Mon, Jan 30, 2017 at 11:03 PM, Mark Phillips <g7ltt(a)g7ltt.com> wrote: > (Please trim inclusions from previous messages) > _______________________________________________ > Rob, > > You might find difficulty sourcing that smoke. That particular smoke has > been EOL for quite some time. > > On Jan 30, 2017 22:54, "vk1kw" <vk1kw(a)netspace.net.au> wrote: > >> (Please trim inclusions from previous messages) >> _______________________________________________ >> Hello All, >> >> I recently had a power supply problem and it has let the smoke out of my >> PacComm TNC-320 packet modem. >> While I have the manual, I do not have a circuit diagram and only have a >> partial id on one of the cooked ICs U17. >> >> The partial number is MC xxxxx06P (I think) and is on the main board across >> the RS-232 D9 connector circuit. >> >> Could you check your circuit diagram, parts list or slide off the cover and >> have a look and let me know what the U17 IC is please? >> >> Many Thanks >> Rob >> VK1KW >> >> _________________________________________ >> 44Net mailing list >> 44Net(a)hamradio.ucsd.edu >> http://hamradio.ucsd.edu/mailman/listinfo/44net >> >