Loud hum in one channel

mjock3 · 5th May 2011, 07:58 PM

I went to change a preamp tube in my Sonic Frontiers SFC-1. After changing it I started getting a loud hum after turning the amp on. It only hums in one channel, and that is both with volume control at 0 as well as the mute switch on. I tried changing that tube again as well as swapping the left and right channel tubes. But still have the hum in left channel. Anyone able to help me on this?

Thanks,

Mark

mjock3 · 5th May 2011, 08:57 PM

Put the original tube back in. Hum was not there. But now left channel is out. And right channel is going in and out. When it is in it seems pretty distorted.

Akita · 6th May 2011, 04:59 AM

What you mean by it is out? distorted?

It may be a quality issue of the replacement tube.

If not, try to check the pin soldering

mastodon · 6th May 2011, 08:58 AM

Sounds like a bad contact somewhere. Check the connections at the tube socket and at the volume pot in particular.

mjock3 · 18th May 2011, 12:34 AM

Spot on!! It was tube sockets. Thanks all

5th May 2011, 07:58 PM	#1
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Loud hum in one channel I went to change a preamp tube in my Sonic Frontiers SFC-1. After changing it I started getting a loud hum after turning the amp on. It only hums in one channel, and that is both with volume control at 0 as well as the mute switch on. I tried changing that tube again as well as swapping the left and right channel tubes. But still have the hum in left channel. Anyone able to help me on this? Thanks, Mark

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5th May 2011, 08:57 PM	#2
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Put the original tube back in. Hum was not there. But now left channel is out. And right channel is going in and out. When it is in it seems pretty distorted.

6th May 2011, 04:59 AM	#3
Akita diyAudio Member Join Date: Dec 2006 Location: Kuala Lumpur	What you mean by it is out? distorted? It may be a quality issue of the replacement tube. If not, try to check the pin soldering

6th May 2011, 08:58 AM	#4
mastodon diyAudio Member Join Date: Jan 2011	Sounds like a bad contact somewhere. Check the connections at the tube socket and at the volume pot in particular.

18th May 2011, 12:34 AM	#5
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	Spot on!! It was tube sockets. Thanks all