Richard, What version TLD1693 amplifier do you have? There are significant differences between the TLD1693C, TLD1693D, and TLD1693E PAs. The capacitors in question have slightly different values, and the four final transistors are different. Since the four finals in your PA are M9625, I think you have either a TLD1693C or TLD1693D amplifier. What is the part number stamped on the PA board? Incidentally, the TLD1693 PA is designed for 150.8-162 MHz, so it is possible that the damage might have been caused by operating it out of band. Are you operating your PA at 2m?
I agree with Jeff that the burned capacitor is C531, which is either a 30 pF or a 36 pF silver mica capacitor with 5% tolerance and rated at 500 volts. If 30 pF, it is Motorola part 2183366K18, and if 36 pF, it is part 2184494B43. Unfortunately, both parts are NLA from Motorola but should be available from commercial suppliers. I find it odd that the two halves of the PA are not symmetrical- one would expect the two parallel PA sections to have the same part numbers. C531 is the mirror of C527, your #2, so I would expect it to be 36 pF, but neither the schematic nor the parts list supports that assumption. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jeff DePolo Sent: Sunday, March 07, 2010 6:59 AM To: [email protected] Subject: RE: [Repeater-Builder] Micor TLD1693 Amp Well, there seems to be a bit of a mystery. The schematic in the base/repeater station manual I have shows: C531 43L 30M 24H But the parts list shows: C531 43L 36M 24H So is it 30 or 36 pF? Who you gonna believe? I checked a mobile Micor manual, and it's listed as 30 pF in the parts list; the schematic doesn't show the component values for the three different ranges, just the C531 designator. Maybe Eric or someone else has a newer manual than I have that has that discrepency corrected. What's the part number for the PA board itself (probably begins with TLD8xxx)? --- Jeff WN3A > -----Original Message----- > From: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Richard Marlin > Sent: Sunday, March 07, 2010 9:42 AM > To: [email protected] <mailto:repeater-builder%40yahoogroups.com> > Subject: [Repeater-Builder] Micor TLD1693 Amp > > Help needed IDing cap. > > > Micor TLD1693 Amp. > > Need assistance in identifying burned capacitor. > > #1 is 51 mmfd > #2 is 36 mmfd > #3 is 75 mmfd > #4 is 75 mmfd > #5 is burned and missing > #6 is 60 mmfd
