Twincam Posted October 24, 2018 Share Posted October 24, 2018 My pf20t has a slight mechanical sounding buzz on low trailing notes. I tried the amp with another bass and another little speaker I had and the sound is still there. Tapped on the valves no microphonics. However I noticed one 12ax7 looks much brighter than the other (pic attached) in fact it's even brighter on one of it's sides to the other. I swapped the valves around and the brighter and dimmer valve is not because of the socket position it's following the valve. The noise is still there maybe not as much but could just be me thinking that. I also noticed an improvement in gain and tone when swapping the valves. They are the same ruby valves but one is a hg and the other a hg+. The hg+ is supposed to be in v1 but the amp sounds better and stronger for it in the other position. I'm hoping it's just a valve going funny. Was going to try some different valves anyhow. But if not the amp will have to go back. Quote Link to comment Share on other sites More sharing options...
Twincam Posted October 24, 2018 Author Share Posted October 24, 2018 Better picture. That doesn't look right to me will buy a new valve and hope it solves it. Quote Link to comment Share on other sites More sharing options...
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