At 08:33 AM 4/1/98 -0500, you wrote: >HI, > > Just a quick question: Why do we care about the production > dates? Were their changes during the production run? > > As the author of an FT736r control program, if there are > subtle differences in the behaviors of old vs. new rigs, > (particularly the CAT interface), I'd be quite interested > in knowing any details... > Hi Al, Some people shopping for a used radio like to know how old it is. With most radios there are changes which sometimes are documented and sometimes not. I have a file of Yaesu Technical Bulletins (TB) for the ft736 detailing changes that were recommended to cure specific problems. I don't know if they were introduced into the production of later radios or not, but I assume they were. These bulletins all date back to the first couple of years of the radio. I have not tried to keep up with it since that time, so I don't know if there are others. These bulletins describe problems that may only show up on a few radios. I never had most of the problems described. TB8813 7-1-88 RF (TX) Signal gets into 430 MHz unit TB8814 7-14-88 High level noise or desense in Mode-J operation (lots 2-5) TB8815 7-29-88 Switching power supply generates noise TB8832 12-27-88 Transmit (SSB) signal get into the audio amplifier circuit TB8820 9-21-88 Abnormal oscillation causes the main vco to unlock TB8821 9-28-88 The PLL is unlocking around the area of 431.0 434.0 MHz TB8830 11-21-88 NB is defeated during full duplex transmission TB8903 3-27-89 Low receive sensitivity at 430 MHz band Rear Heatsink Heat Buildup Mods - no date "Eliminates heat buildup on rear heatsink when it is in SAT mode and also will improve external linear amplifier control." Having said all this I must comment that the ft736 has been a very reliable radio. Mine has been back to Yaesu for service only one time in 10 years. I would not hesitate to sell mine or to buy one of similar age. 73, ron w8gus.