Hi Ref
Yes all the electrolytic capacitors have been changed one at a time, although some measured as high as 10 ohms on my Peak ESR tester, changing them made hardly any difference to the operation of the radio. Each one I tested and changed I thought, ah this will be the cause, but no. I was thinking of leaving the fault and offer it as a challenge for anyone to fix at this Sundays get together here in Basildon.
I originally found by trial and error that adjusting the preset R7 in the IF section fixed the issues. I then read what it did in the service instructions ( hadnt printed that page out). I have been back and adjusted it to give 4 volts across R9 the 2.2k resistor, but I found it caused the radio to give a sort of popping effect in the audio, it sounded best with the resistor set to give a voltage of 2.9v on R9.
Next up will be a Regentone BT21, just arrived today, slightly earlier then this Regenteener, and boasting 7 transistors, one of which seems to be doing not much more than acting as a detector, a good marketing ploy.
Thanks guys for the information on the function of the diode, and the links to the web pages, some reading for tonight.
Mike
Yes all the electrolytic capacitors have been changed one at a time, although some measured as high as 10 ohms on my Peak ESR tester, changing them made hardly any difference to the operation of the radio. Each one I tested and changed I thought, ah this will be the cause, but no. I was thinking of leaving the fault and offer it as a challenge for anyone to fix at this Sundays get together here in Basildon.
I originally found by trial and error that adjusting the preset R7 in the IF section fixed the issues. I then read what it did in the service instructions ( hadnt printed that page out). I have been back and adjusted it to give 4 volts across R9 the 2.2k resistor, but I found it caused the radio to give a sort of popping effect in the audio, it sounded best with the resistor set to give a voltage of 2.9v on R9.
Next up will be a Regentone BT21, just arrived today, slightly earlier then this Regenteener, and boasting 7 transistors, one of which seems to be doing not much more than acting as a detector, a good marketing ploy.
Thanks guys for the information on the function of the diode, and the links to the web pages, some reading for tonight.
Mike
