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10 volts does seem a bit low. here are the correct voltages for the audio chip: LC

yeah your picture is correct but everything you posted sounds like you lifted pin 10 off the board instead of pin 1. also, the chip should be installed with the label facing the chassis wall. any chance it got put in backwards? LC

Seems to me that the 10.75 volts on pin 1 of the audio chip is your issue. that comes directly off of the main V+ into the radio. something is pulling that voltage down as it should be almost 14 volts. First, you can try lifting pin 1 off of the PC board and checking that trace, to see if it...

the diode is a regular old 1N4148 or similar. Ive done this mod to a few new style 2995s and found that any resistor value wouldn't allow the negative peaks to reach near 100%. i ended up just using the diode alone. however, i do not clip any limiters when i do this mod. Trucks may have...

Eldorado, if you have a scope, can you tell us what the negative peaks look like with this mod? I believe that it will show them not even achieving 90%. LC

AI says these two might be candidates. I'll leave it to those more experienced than i to read the datasheets: https://www.digikey.com/en/products/detail/ixys/IXFQ60N50P3/2650882 DATASHEET: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/7125/DS100311BIXFHFTFQ60N50P3.pdf...

Thank you for posting that SAMS. i tried searching for it but the search function on this forum is not so great. so the diode you are looking for is D-506. the AMC is VR8. you'll want to peak the transmit before you do the mod so you will end up with the desired deadkey level without...

if you do have a schematic, please take a good pic of it and post it here. LC

BahamaDon, This mod works on pretty much all old AM only CB radios that use a modulation transformer. the difference is the part numbers. without CB209 i can't be sure of the exact numbers but i can tell you that your TRC465 is basically the same board as the TRC424 and the TRC431. the only...

It seems like it might be the same board that's in the TRC-431. if someone can confirm that for me i can type up how to do the mod. LC

Can someone tell me if this radio has a similar chassis that might be on CBtricks? looks like it uses the UPD861 PLL but i need to know which radios share the same PC board. This radio is a perfect candidate to use the anti spiking diode to reduce deadkey. do not de-tune L903 to lower power...

Has anyone considered that it might be the current state of global commerce and specifically importing things into the USA that ultimately crushes Galaxy's ability to generate a profit? We all know how and why "export radios" make it to us in the first place. Things have changed recently (can...

now you just need to do Exit13's NPC mod to it! Rick came up with it as far as i know, and i love it. Many others do as well. you might need to add a variable AMC control in that president because it might have an "R130" which i believe is a 1.5K resistor and makes the AMC a fixed control. It...

828, I, like many others quite a few years ago got caught up in the hooplah about the 2999 transistor and the schottky mods. After all kinds of testing and tweaking, none of it scientific, i, like many others realized the juice just aint worth the squeezin on that mod. I really thought i...

ouch Brandon that had to hurt the ol' ego a bit lol. i still find candle wax in tuning cans sometimes. People really need to stop doing this. you can buy more bees wax than you'll ever need for less than 10 dollars on amazon...

ok if this board is the same as the one in your 29LTD, then look for D404. its that big black rectifier diode right next to the modulation transformer. Since all the part numbers are different as well as the board layout, we should confirm that it's actually the right diode. We can do this by...

got a picture of the PC board? LC

thanks for the kudos Dave! W5NPJ, I would be happy to do the work you need done, but know that i am about three months backed up with radio work right now. If you would like to discuss details please click on my name over on the left and choose "send a direct message". LC

This is so sad to hear. I am very proud to have called Jim a friend for 20 years. Over the years we've exchanged advice, stories, and even equipment. We never got to hear each other's voices except for one almost QSO where we confirmed on the forum the next day that we'd heard each other but...

thanks Mike. Im doing the same thing. LC