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UPDATE I found out the problem its the power outlet in back of radio, If I run power to the inside of plug from power supply its doesn't do that. everything on this one is back to normal. I really appreciate every ones Help, Knowledge, and Expertise. I would not have been able to accomplish...

Hello, Thank you its just a old cobra 29 ltd classic that i hooked up backwards with a old GE power cord that was reversed in polarity and blew my diode I changed it and then I had no modulation. so i traced the modulation trail as LC described in beginning of post and found nothing wrong then...

Thank you nomadradio after checking voltages my modulation started working again must have had some resistors touching or something? now its really acting funny when dead key is at 1-2 watt or less it swings to about 15 watt but if i lay my hand on the radio or hold it it will swing to about...

Thank you, I will check it out. 73's

I have same problem as David but the cb tricks link above for testing voltages will not load could someone help with a new link for me please

Nice work gave me some ideas thanks

hello everyone