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Low Voltage Causes Overdrive Shutdown of Amplifier


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When I got the Tokyo Hy-Power solid state amp, I had a 240volt line installed for it. This week we had some electrical work done, including installing a new breaker box in the basement. Some of the work required that I remove the radio equipment from the operating desk so it could be moved to allow access to some of the outlets behind it. (not the 240 line).

Last night I reassembled the station and gave it a try. INSTANT amplifier shutdown due to overdrive condition. I had to lower the transceiver output power to about 5 volts to prevent this from occurring, which resulted in an amplifier output of less than 50 watts. After checking connections and referring to the owners manual for a few hours I had an idea. 

Inside the amplifier, there are various combinations of transformer connections for 110/120/130 and 220/230/240 AC supply voltages. Thinking that perhaps I had the transformer connected for 220 and now had 240 at the wall, I whipped out the handy volt meter to check the wall socket. What I found was that I had 120 at my 240 volt outlet. I flipped the amp over and moved the switch to the 120 volt position and found that the trouble had gone away. 

Very Interesting.

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Hey Lind. What's bizarre is that the 240v outlet went to 120v. Is it just that outlet or did all of your 240 go away.

Also funny because this very morning, Maria and I were having a conversation, on a different topic, and the 110/220 discussion was a part of it 🤔

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