[Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Max Cotton
I have a very nice R4C it had a hum with bad audio distortion so I decided to investigate, whilst taking it apart I noticed that if I touched the noise blanker the hum would alter, I removed the NB board and the hum was still there, I found eventually that the audio transistor had desoldered

Re: [Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Paul Christensen
: Wednesday, October 31, 2012 2:10 PM Subject: [Drakelist] R4C Hum and audio transistor I have a very nice R4C it had a hum with bad audio distortion so I decided to investigate, whilst taking it apart I noticed that if I touched the noise blanker the hum would alter, I removed the NB board

Re: [Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Paul Christensen
would rather just deal with the root issue and solve it. Paul, W9AC - Original Message - From: kc9...@aol.com To: w...@arrl.net ; drakelist@zerobeat.net Sent: Wednesday, October 31, 2012 2:39 PM Subject: Re: [Drakelist] R4C Hum and audio transistor Why not install

Re: [Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Max Cotton
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

Re: [Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Richard Knoppow
- Original Message - From: Max Cotton airra...@dsl.pipex.com To: drakelist@zerobeat.net Sent: Wednesday, October 31, 2012 11:10 AM Subject: [Drakelist] R4C Hum and audio transistor I have a very nice R4C it had a hum with bad audio distortion so I decided to investigate, whilst

Re: [Drakelist] R4C Hum and audio transistor

2012-10-31 Thread Bert Almemo
[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

Re: [drakelist] R4C hum

2005-08-14 Thread Bob Henderson
installation too. 73 Bob, 5B4AGN - Original Message - From: AD3G To: drakelist@www.zerobeat.net Sent: Sunday, August 14, 2005 4:18 AM Subject: [drakelist] R4C hum Hello list...I recently acquired a nice R4C,but it has some issues...I powered up slowly on a variac

Re: [drakelist] R4C hum

2005-08-14 Thread Gary Poland
Paul, There is a mod to relocate the wiring that connects from the power supply board to the can filter capacitor outside of the main harnessand route themalong the outside edgeof the chassis with heavier gage wire. This helps reduce the hum. 73, Gary

[drakelist] R4C hum

2005-08-13 Thread AD3G
Hello list...I recently acquired a nice R4C,but it has some issues...I powered up slowly on a variac,but the filter caps were hopelessly shot. I replaced with a Sherwood filter cap kit.I have far less hum,but it's still there,just not as bad(I can hear reciever hiss now). Would a power