I have a Fisher 500c that has been recapped and serviced. I have had it for the last few months and love it. I just recently replaced a couple of the old tubes for the high and low filters, tubes V14 and V15 with new Sovtek 12AX7's.
The sound of the receiver improved and it really opened up. However, there is now a noticeable buzz in the left channel. The buzz is present at zero volume regardless of source, and it is not altered at all by volume, tone, or balance controls. I am also using very efficient Klipsch speakers, so I know they are going to really pick up on any buzz from the receiver whereas my other speakers would not. The buzz doesn't affect sound quality when music is playing, but it bothers me when changing records, etc. The right channel is very quiet with no buzz at all.
I put the old tubes back in just to make sure it wasn't the new tubes themselves. The buzz was still present with the old tubes, I just didn't really notice it. The new tubes just make it stand out more, as the sound is much more clear.
Where should I be looking first for the buzzing sound? I am pretty new to troubleshooting equipment myself, but since it is independent of source, volume, and tone, it seems like it may just be some leaky voltage coming from somewhere? Thanks.
The sound of the receiver improved and it really opened up. However, there is now a noticeable buzz in the left channel. The buzz is present at zero volume regardless of source, and it is not altered at all by volume, tone, or balance controls. I am also using very efficient Klipsch speakers, so I know they are going to really pick up on any buzz from the receiver whereas my other speakers would not. The buzz doesn't affect sound quality when music is playing, but it bothers me when changing records, etc. The right channel is very quiet with no buzz at all.
I put the old tubes back in just to make sure it wasn't the new tubes themselves. The buzz was still present with the old tubes, I just didn't really notice it. The new tubes just make it stand out more, as the sound is much more clear.
Where should I be looking first for the buzzing sound? I am pretty new to troubleshooting equipment myself, but since it is independent of source, volume, and tone, it seems like it may just be some leaky voltage coming from somewhere? Thanks.