That was a bit of microsurgery on those pots. I have just replaced the two pots on my TR751A, with the Ranger pots from R&R Comms in the USA. The pin separations were not identical to the original pots, but the new ones do work ok. But for the size of the original pots I take my hat off to you for repairing those little wipers. (Vk1da)
@@Nar1117 hi Robert, the part numbers were given by someone in the TR751A/851A group on yahoo, but that group has been moved to groups.io and you will be able to find it there using the search tool. I’m away from home right now but if I do find the part numbers before I’m home again I’ll post them here. 73 Andrew vk1da
I have a TR 751A that has set In storage for probably 20 years due to health reasons. I uncovered it today and hooked it up but I’m not getting sound other then when I push a button. I attached an external speaker, There is no squelch sound all the way counter clockwise volume full. I have adjusted all the knobs. I transmitted and my signal it’s great. Would the internal battery if dead be the cause of no sound? Thanks.
Hi Andy, I have one of these radio, the pot is OK but I have a slight buzz on TX audio, even on battery power so not PSU, any ideas PS it's a great radio love these old style radios. Brian
It could be any number of things so I would just be guessing. Check the power supply is clean, then start looking at the audio starting at the microphone and working your way . You will need an oscilloscope.
@@Guru-sh9mz Look for poor grounding anywhere in the audio path. You've eliminated the power supply so that's a start. Try to put the radio in TX mode with the microphone disconnected ... for example, try CW mode. That should eliminate anything in the audio path.
Hi Andy would a 2mhz oscilloscope be OK for checking as there is one fir sale with leads for £50 a few miles from me on market place again thanks for your help
Hello. N3VMM here. How did you get the pots to stay together? Trying to get mine fixed. the on/off/squelch pot is bad, did what your video said but how to keep them together is the need
To dismantle the pots I filed the ends off the rivets at the rear of the assembly (actually they're more like pins than rivets but the ends are riveted over to hold the thing together). Once I had done the repair to the pot I very carefully tapped the pins (rivets) lightly with a small hammer to increase their length by a few millimetres. Don't tap hard, just lightly while turning the pin ... a bit like rolling out pastry using your fist if you can imagine that. It only needed a few millimetres increase in the length of the pins and I was able to reassemble the pot, put the pins back through, then with good end on a firm, metal surface and holding the assembly together I used a small hammer and a light tapping to rivet over the other end, holding the assembly back together permanently in the same way as it was originally. A nail punch can be very useful in re-riveting the ends of the pins. If the old pins can't be re-used some people have successfully used copper wire of an appropriate diameter to make new pins/rivets.
@@VK2AAK had to replace the pot totally. Fell apart once opened up. Not worth fixing it. Ordered a new old stock one. Think I have to purchase a new soldering iron to finish up. Thanks for video and the information
You were very lucky to find NOS replacements Dennis. I searched high and low here and couldn't find one. Good luck with it. They're a very nice radio and well worth the effort :)
I put solid core wire through mine and put a blob of solder either end to hold it together, this way I can easily remove the solder if I never need to take it apart again.
@@VK2AAK I've done some research and it seems like you can get a part number rv50303522 it's the volume squelch control out of a galaxy CB I guess with a little modification that go in and work well.... I'm looking at buying one of these tr75 1A and the seller sent me a video demonstrating the volume and squelch and it had no hiccups or no problems he's asking $500 SUD
@@deddie4645 I did look at obtaining the pot from the Galaxy CB but discovered that nobody actually had any. I tried all manner of places looking for a replacement part without success. That’s why I ended up fixing the original pot. I sold the unit I repaired for $100 Australian. It’s still going fine.
I need a radio for off-roading(( and because big Tech is censoring any free speech the news media's are now the propaganda wing of the government I feel they could shut down the communications grids at any time and a good ham radio is a good investment and self-sufficiency)) the seemed a little bit big for me to put in a Toyota 4Runner is I'm 6ft Ford 350 lb.. . Do you think I'd be better off with a more modern smaller radio. is the price too much......... is that kind of a guarantee problem in that radio with time... I think it's really difficult find anyone in America that does these type of repairs.. anymore I'm seeing more and more people dieding off and ham in the widows hubby radios & stuff......
@@deddie4645 If you're looking for a portable or mobile "pepper" radio I would lean more toward something more modern. The TR-751 is a fine radio and very sensitive ... but it's decades old and probably a bit fragile to be bouncing around in a 4WD. Perhaps something like a Yaesu FT-817/818 or if you want higher power a FT-857. Both these are all bands, all modes and very versatile. Of course, they're likely to cost you a bit more. I personally wouldn't pay more than around $200 Australian for a 751.
@@VK2AAK Thanks for the reply:) It doesn't matter what I set it to it still beeps claiming it's out of band, even though I set it to my usual repeater frequencies. I will double check split setting. Cheers, VK5LEX
Ive been through all of the settings and tried VFOA and B , no change. Definately on 147.000 which I always use for our local repeater, and it gives me the 3 beeps like out of band. It used to beep out of band but now it's all frequencies... I'm stumped.
Another Kenwood revived! ❤
That was a bit of microsurgery on those pots. I have just replaced the two pots on my TR751A, with the Ranger pots from R&R Comms in the USA. The pin separations were not identical to the original pots, but the new ones do work ok. But for the size of the original pots I take my hat off to you for repairing those little wipers. (Vk1da)
Hey Andrew, I'm about to perform a similar repair... could you tell me the part number of the pots you purchased from R&R? Thanks!
@@Nar1117 hi Robert, the part numbers were given by someone in the TR751A/851A group on yahoo, but that group has been moved to groups.io and you will be able to find it there using the search tool. I’m away from home right now but if I do find the part numbers before I’m home again I’ll post them here. 73 Andrew vk1da
I have a TR 751A that has set In storage for probably 20 years due to health reasons. I uncovered it today and hooked it up but I’m not getting sound other then when I push a button. I attached an external speaker, There is no squelch sound all the way counter clockwise volume full. I have adjusted all the knobs. I transmitted and my signal it’s great. Would the internal battery if dead be the cause of no sound? Thanks.
No, the internal battery wouldn't cause that problem. If your unit is fitted with the optional CTCSS tone board make sure tone is off.
You don't happen to have a 4 pin aux plug for one of those laying around?
Thanks and 73
Unfortunately not a spare one ... sorry.
Hi Andy, I have one of these radio, the pot is OK but I have a slight buzz on TX audio, even on battery power so not PSU, any ideas PS it's a great radio love these old style radios.
Brian
It could be any number of things so I would just be guessing. Check the power supply is clean, then start looking at the audio starting at the microphone and working your way . You will need an oscilloscope.
Thanks Andy in getting back to me so quickly very much appreciated 73's
@@Guru-sh9mz Look for poor grounding anywhere in the audio path. You've eliminated the power supply so that's a start. Try to put the radio in TX mode with the microphone disconnected ... for example, try CW mode. That should eliminate anything in the audio path.
Hi Andy would a 2mhz oscilloscope be OK for checking as there is one fir sale with leads for £50 a few miles from me on market place again thanks for your help
20mhz not 2 mhz sorry
Great video 73 Tom Vk3ftom
You cut the 2 hrs of fiddling and cursing. What glue did you use?
I used "Araldite" ... a two part epoxy. I lightly scraped and roughened the plastic parts to give the epoxy something to stick to.
Hello. N3VMM here. How did you get the pots to stay together? Trying to get mine fixed. the on/off/squelch pot is bad, did what your video said but how to keep them together is the need
To dismantle the pots I filed the ends off the rivets at the rear of the assembly (actually they're more like pins than rivets but the ends are riveted over to hold the thing together). Once I had done the repair to the pot I very carefully tapped the pins (rivets) lightly with a small hammer to increase their length by a few millimetres. Don't tap hard, just lightly while turning the pin ... a bit like rolling out pastry using your fist if you can imagine that.
It only needed a few millimetres increase in the length of the pins and I was able to reassemble the pot, put the pins back through, then with good end on a firm, metal surface and holding the assembly together I used a small hammer and a light tapping to rivet over the other end, holding the assembly back together permanently in the same way as it was originally. A nail punch can be very useful in re-riveting the ends of the pins.
If the old pins can't be re-used some people have successfully used copper wire of an appropriate diameter to make new pins/rivets.
@@VK2AAK had to replace the pot totally. Fell apart once opened up. Not worth fixing it. Ordered a new old stock one. Think I have to purchase a new soldering iron to finish up. Thanks for video and the information
You were very lucky to find NOS replacements Dennis. I searched high and low here and couldn't find one. Good luck with it. They're a very nice radio and well worth the effort :)
I put solid core wire through mine and put a blob of solder either end to hold it together, this way I can easily remove the solder if I never need to take it apart again.
where can I get a Kenwood TR 751 display ?
I think your only chance is finding a junked radio and stripping the parts out.
I'm trying to use my TR 751 in a vehicle again. It has issues. Do you take these on to work on?
Hi Norman. I've been retired from doing commercial repair work for some time. Where are you located?
@@VK2AAK Mandan North Dakota
Norman Ravnaas The shipping would probably exceed the value of the radio ... I’m in Australia.
Andy Keir thank you
Did they ever at the end of this production run design out this flaw from the radio
To the best of my knowledge the problem with the pots was never fixed in production.
@@VK2AAK I've done some research and it seems like you can get a part number rv50303522 it's the volume squelch control out of a galaxy CB I guess with a little modification that go in and work well.... I'm looking at buying one of these tr75 1A and the seller sent me a video demonstrating the volume and squelch and it had no hiccups or no problems he's asking $500 SUD
@@deddie4645 I did look at obtaining the pot from the Galaxy CB but discovered that nobody actually had any. I tried all manner of places looking for a replacement part without success. That’s why I ended up fixing the original pot.
I sold the unit I repaired for $100 Australian. It’s still going fine.
I need a radio for off-roading(( and because big Tech is censoring any free speech the news media's are now the propaganda wing of the government I feel they could shut down the communications grids at any time and a good ham radio is a good investment and self-sufficiency)) the seemed a little bit big for me to put in a Toyota 4Runner is I'm 6ft Ford 350 lb.. . Do you think I'd be better off with a more modern smaller radio. is the price too much......... is that kind of a guarantee problem in that radio with time... I think it's really difficult find anyone in America that does these type of repairs.. anymore I'm seeing more and more people dieding off and ham in the widows hubby radios & stuff......
@@deddie4645 If you're looking for a portable or mobile "pepper" radio I would lean more toward something more modern. The TR-751 is a fine radio and very sensitive ... but it's decades old and probably a bit fragile to be bouncing around in a 4WD. Perhaps something like a Yaesu FT-817/818 or if you want higher power a FT-857. Both these are all bands, all modes and very versatile. Of course, they're likely to cost you a bit more.
I personally wouldn't pay more than around $200 Australian for a 751.
How can I contact with you?
You just did :)
I have an issue with mine where it no longer wants to do offset -600 +600 anymore and just does 3 beeps on TX on any frequency
Does it work correctly on simplex? … no offset?
@@VK2AAK Yeah it does which is weird...
It will be something to do with the offset or split mode. The beeps indicate it’s trying to transmit out of band.
@@VK2AAK Thanks for the reply:) It doesn't matter what I set it to it still beeps claiming it's out of band, even though I set it to my usual repeater frequencies. I will double check split setting. Cheers, VK5LEX
Ive been through all of the settings and tried VFOA and B , no change. Definately on 147.000 which I always use for our local repeater, and it gives me the 3 beeps like out of band. It used to beep out of band but now it's all frequencies... I'm stumped.