"Dick Harms PA2DW" <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Mike, I do think that the HEF series equals the motorola MC-line. In that case a HEF-40138 should fit and these can be bought in many stores. If you cannot find any, I dont mind to have a go here for you!
73, Dick/PA2DW -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Garey Barrell Verzonden: zondag 20 februari 2005 17:47 Aan: Mike Williams CC: Drakelist Onderwerp: Re: [drakelist] DR-7 Display Garey Barrell <[EMAIL PROTECTED]> made an utterence to the drakelist gang ---------------------------------------------------------------------- Mike - These are Motorola ECL IC's. They have been considered obsolete for years, and short of finding one in a junkbox somewhere, very difficult to come by. The "parts brokers" have thousands, but they only want to _sell_ in thousands also! You might try reflowing the solder, since sometimes a cracked through-hole or solder joint will present this way. 73, Garey - K4OAH Atlanta Drake C-Line Service Manual <http://hr99.home.mindspring.com/R-4C_Servicez/> Mike Williams wrote: > Thanks to all who offered advice on the digital display on my TR7 > which was ( is) going bonkers. The problem was that after an hour of > warm up the display would start to display random digits very > rapidly. The radio was still on frequency. To complicate matters, I > tried the counter function with a wire in the back of > the ext counter connector and switch set to EXT. for the external > counter function. Sometime the counter display worked properly with a > 144 MHz signal input and sometimes not. Tested dc voltages and tried > to signal trace but my scope's bandwidth prevented any solid > measurements. Finally isolated the problem down to U9013 on the DR7 > board by blasting it with freeze mist; repeated this test numerous > times with the same results. Looks like a thermal intermittent. Here > is the question; anyone know where I can find this chip? MC 10138 P > is stamped on the top of the case and the Drake parts list just calls > it a 10138. I have searched a few electronics sites with no avail. > > > Thanks much, > > Mike W4DL ---------------------------------------------------------------------- On Behalf of Garey Barrell <[EMAIL PROTECTED]> Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ---------------------------------------------------------------------- ---------------------------------------------------------------------- On Behalf of "Dick Harms PA2DW" <[EMAIL PROTECTED]> Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
