Leiker535
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- Jul 7, 2020
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Hello all, I'm having a problem with my tube amp that is driving me insane. I don't know if this is the correct area for this, if not, please notify. Here goes:
I've owned a LD MKIII for a few years now (since 2013), but about a year ago I started noticing these annoying electrical buzz and malfunction with it. I associated it instantly with the power tubes (6n6p), so I had them switched out as I've done a couple of times before.
Turns out though that the problem just won't go away even with two coupled new pairs. The buzzing starts very loudly after turning up, and diminishes after heating the valves, HOWEVER, it randomly comes back even at prolonged use (that has never happened before). I notice that fiddling with the powers can help, as when I touch them sometimes the buzz goes away, only to come back later or even instantly after I let them go. Touching drivers have little effect on "fixing" too so I think it is more power tube related. Ive also noticed that fiddling with the Hp connector sometimes affects the buzz, yanking the connector gently, as it is physically moves the tubes.
I've already isolated everything upstream, the problem persists even with different power cable, outlet, ac transformer (I got it when I lived in a 220v area, but now I live in 110v so use a small converter). I think therefore it is something altogether inside the amp, because even with the RCAs disconnected the buzz persists (so no groundloop error).
What could be at fault here? I've been thinking of opening up to check sodders and such, but have few electrical experience/background , and am even a tad afraid of messing with such a different electrical circuit. Does anyone have had this kind of problem with the LDs or similar amps?
I've owned a LD MKIII for a few years now (since 2013), but about a year ago I started noticing these annoying electrical buzz and malfunction with it. I associated it instantly with the power tubes (6n6p), so I had them switched out as I've done a couple of times before.
Turns out though that the problem just won't go away even with two coupled new pairs. The buzzing starts very loudly after turning up, and diminishes after heating the valves, HOWEVER, it randomly comes back even at prolonged use (that has never happened before). I notice that fiddling with the powers can help, as when I touch them sometimes the buzz goes away, only to come back later or even instantly after I let them go. Touching drivers have little effect on "fixing" too so I think it is more power tube related. Ive also noticed that fiddling with the Hp connector sometimes affects the buzz, yanking the connector gently, as it is physically moves the tubes.
I've already isolated everything upstream, the problem persists even with different power cable, outlet, ac transformer (I got it when I lived in a 220v area, but now I live in 110v so use a small converter). I think therefore it is something altogether inside the amp, because even with the RCAs disconnected the buzz persists (so no groundloop error).
What could be at fault here? I've been thinking of opening up to check sodders and such, but have few electrical experience/background , and am even a tad afraid of messing with such a different electrical circuit. Does anyone have had this kind of problem with the LDs or similar amps?