Stofferson Posted January 30, 2020 Share Posted January 30, 2020 Hi guys, ABM 600 into BF410. Playing at home at the "neighbours aren't in volumes" and noticed it was proper farting out on particular notes, C on the A string mainly, proper weird, anyway, took the amp off the top of the cab and tried it again. . no farting, is this a head issue? Really weird Quote Link to comment Share on other sites More sharing options...
stewblack Posted January 30, 2020 Share Posted January 30, 2020 (edited) So often it's something vibrating. I had a farting sound started up last night and turned out to be a lead c®apping out. Never easy to work out the cause Edited January 30, 2020 by stewblack Quote Link to comment Share on other sites More sharing options...
Stofferson Posted January 30, 2020 Author Share Posted January 30, 2020 Quick Google may suggest it's the pre amp valve? Might change that and see how it is Quote Link to comment Share on other sites More sharing options...
Paul S Posted January 30, 2020 Share Posted January 30, 2020 If it was the preamp valve surely it wouldn't have stopped farting when you took the head off the cab? I had a similarly perplexing farting noise from my old Trace Elliot/Barefaced rig and it ended up being the handle of the head rack case vibrating. Quote Link to comment Share on other sites More sharing options...
Frank Blank Posted January 30, 2020 Share Posted January 30, 2020 (edited) Heh, I thought this might be a thread about farting in taxis, I’ll start my own entitled Lift Farting. Edited January 30, 2020 by Frank Blank 2 Quote Link to comment Share on other sites More sharing options...
Stofferson Posted January 30, 2020 Author Share Posted January 30, 2020 55 minutes ago, Paul S said: If it was the preamp valve surely it wouldn't have stopped farting when you took the head off the cab? I had a similarly perplexing farting noise from my old Trace Elliot/Barefaced rig and it ended up being the handle of the head rack case vibrating. Vibrations maybe? I have no idea, microphonic maybe? But yeah put the head on it's side next to the cab and played as I did and seemed to work Quote Link to comment Share on other sites More sharing options...
Stofferson Posted January 30, 2020 Author Share Posted January 30, 2020 52 minutes ago, Frank Blank said: Heh, I thought this might be a thread about faring in taxis, I’ll start my own entitled Lift Farting. Deffo an on stage ripper, my apologies to the rest of my band Quote Link to comment Share on other sites More sharing options...
Jonse Posted February 1, 2020 Share Posted February 1, 2020 On 30/01/2020 at 15:19, Stofferson said: Quick Google may suggest it's the pre amp valve? Might change that and see how it is I had a similar farting noise through my barefaced six10, the noise was being produced only on the low G. I was using an orange ad200b at the time and I reseated the preamp valves and the noise stopped. Very weird. Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted February 3, 2020 Share Posted February 3, 2020 On 01/02/2020 at 16:22, Jonse said: I had a similar farting noise through my barefaced six10, the noise was being produced only on the low G. I was using an orange ad200b at the time and I reseated the preamp valves and the noise stopped. Very weird. Not really, valves work with a series of metal plates and grids as the valves age the plates lose material and the plates move about and distort changing the electrical properties, in the end most of them become microphonic picking up vibrations and passing them though the amplifier on to the speakers. In addition they can become loose in their sockets as you mentioned, so there are plenty of ways odd sounds can occur through mechanical noises. Solid state is … well it's solid 1 Quote Link to comment Share on other sites More sharing options...
pintspiller Posted February 5, 2020 Share Posted February 5, 2020 My Hartke 410 had a farty speaker when I got it (I bought it used). I put a Chinese tub between the grill and the speaker for a few weeks. The cone had lifted from the chassis or something. Quote Link to comment Share on other sites More sharing options...
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