Bill - C190 and/or C192.
73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> Bill & Becky Marvin wrote:
Hello Group I have been working on my R4B that has Calibrator Buzz and intermitent low audio Hum. All tubes are now good and the SSB/Cw receive is very clean. I replaced the Bias Cap 8 uF no go. Any hints Best 73 Bill KB9IVV
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