UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Kenwood TM322. (Actually a TM-733).

John-39 · 27th May 2020, 9:16 pm

Thank you for your research into this. It would be interesting to know what the tone level should be before it is sent to the V/UHF PCBs, just in case there is a fault on the Control PCB. But there is a contradiction: 1) the test at the end of the Adjustments section in the manual gives a measured value that I take to be the deviation with TONE switched on: this figure is +/-0.5 to +/- 1.5 kHz, and my measurement is bang in the middle, and 2) the 'old radio' theory doesn't quite explain it because my correspondent would need an 'old' radio to hear the hum, in which case he would hear the hum on all radios, and wouldn't have commented on it. I think I'll just have to put up with it! Thanks again!

27th May 2020, 9:16 pm	#15
John-39 Triode Join Date: Mar 2016 Location: Chelmsford, Essex, UK. Posts: 11	Re: Kenwood TM322. (Actually a TM-733). Thank you for your research into this. It would be interesting to know what the tone level should be before it is sent to the V/UHF PCBs, just in case there is a fault on the Control PCB. But there is a contradiction: 1) the test at the end of the Adjustments section in the manual gives a measured value that I take to be the deviation with TONE switched on: this figure is +/-0.5 to +/- 1.5 kHz, and my measurement is bang in the middle, and 2) the 'old radio' theory doesn't quite explain it because my correspondent would need an 'old' radio to hear the hum, in which case he would hear the hum on all radios, and wouldn't have commented on it. I think I'll just have to put up with it! Thanks again!