Hi Max, I replaced the original audio amp in the R4C with a Velleman audio kit board with an TDA2003. The Velleman kit # K4001. I believe I paid around $ 15.00. Works great. If you're interested I can send you pics. 73 Bert, VE3NR
_____ From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Max Cotton Sent: Wednesday, October 31, 2012 3:12 PM To: drakelist@zerobeat.net Subject: Re: [Drakelist] R4C Hum and audio transistor I must admit this receiver will probably benefit from the Sherwood audio board, however comparing both my R4C's one is perfect with no hum and very good audio whilst this one is shushy and has bad hum, maybe the main caps need replacing but when I couple another cap accross them no change so I am a little reluctant to ditch them quite yet. swapping the tubes between each made no difference either. It does do an odd thing though, gradually as it warms up the audio and signal gets worse until it is distorted and with a lot of white noise. When switched on, the hum is really bad immediately and does not go away. both receivers are 26000 serials within about 700 from each other. Ideas? 73 Max M0GHQ
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