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I just bought a 4300-300 . When I plugged it in and started talking on low, (50) watts it was okay. As I turned the power up it started to oscilat and squeal. I was going to call the guy I bought it from but I check the mic and screwed on tight. The noise went away. I have it set keying...

Thanks. I signed in. I will search

I did a Google search for Jim's Wix site , but it only comes up with ( wix build your own free website) can you give me the link for the site you're talking about?

I will order the recap kit from Klondike and start the process. I will take notes and let you guys know. This will be my first cap replace. I also would like to add a carrier control along with new final and driver. 25 watts would be nice. Does anyone know the transistors that are a...

That is the tone

Haha. I have not tried the car yet. I used that link.

115v ac 60hz 250 watt continues regulated powersupply. 13.8 v dc output. I think linear. Brand new out of the box.The radio makes the hum plugged into the wall, also when I plugged it into the power supply. I have antenna plugged into radio. When I unplug antenna, the am static and receive go...

I found something weird. I tried this with headphones and the external speaker. With the volume nob down all the way so nothing except the hum is heard . I turned the squelch up and the hum gets louder. The more squelch is turned up the louder the hum gets. If I turn power/ volume nob off and...

I tried both ways. Antenna plunged in and unplugged. The hum is there both ways

I tried stock mike, astatic power mic and a rod talker mic. Volume up or down the hum is there in both positions am receive or pa with all 3 microphones.

Okay. I tried the unit unplugged on 12 dc power supply. Hum is still there

Okay. I plugged the external speaker into the PA jack on the back of the radio. I pushed PA buton on and the hum is there.

Okay. PC-198A8 is the # on the board. The unit does have the PLL D858 chip. The unit looks original inside. All the wax is still untouched, but no coil in l11. Does it need it ? no jumper or clipped parts, and no burn spots on the board. Maybe the audio chip was replaced? It has NEC C1156H...

Okay. I plugged external speaker into the unit and turned unit on. I pushed in the pa button and the meter lights went out . The channel light was still on. I tried speaking through the pa circuit but nothing was heard. I'm assuming the pa circuit is not working. Is there something in the...

Okay . I unplugged the power cord and used 30 amp power supply with mobile cord plug in back of radio. The hum is still there. I notice if I turn the volume all the way down so no receive is heard, the hum is still there. If you turn the power/ volume nob off and then back on it takes a...

Hello. I bought a president dwight base station. The unit turns on and meters light up. There is a hum on receive. I unplugged the speaker and tried a set of headphones. The hum is still there . What can I check or replace so the receive is clear ?