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Old 10-26-2025, 10:39 AM
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teevee teevee is offline
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Yup. after all, if the filters failed, you could wire $1.25 to AK and they'd send a replacement!

Also, check the 300 Ohm grid resistors on the back of the tuning caps, a high failure item due to corrosion of the exposed resistance wire...
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Old 10-28-2025, 02:21 AM
Videotechie Videotechie is offline
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Thanks for info space control.. great info. I believe the 2nd audio bias resistor shorted 3. Possible bad tube or someone accidentally shorted spkr terminal.
I'm gonna do something different when restored. Might replace bottom plates for cabinet and power supply with geometric metal sheet. Some scopes and other equipment used this to give units ventilation to cool. Mass produced at home depot should lighten this boat anchor a bit.
These unis are made extremely well and shouldn't be discounted. Copper tuning belts with brass wheels well made as AKs are..
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Last edited by Videotechie; 11-20-2025 at 03:26 AM.
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