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I am using a More Fidelity 300B and until recently had a pair of Heresy IIs. The speakers would always pop as the tubes wamed up (only the right 'speaker I think) but it never laster more than a minute or so, so it didn't concern me. I have now got a pair of original Horning Agathons using PM6As. What's bizarre is that the drivers pop morenow and it doesn't seem to stop as before - happening every 30 seconds or so.I am worried about damage to the cones and also not sure of the origin of the pops.
Any advice?
Follow Ups:
Nick,
You have received some really sage advice from others who have experience with both of these. Here is my take considering that THESE are your choices. I Used to sell both of these products at the same time (actually side by side) with the K-Horns in the corners and the L-300 hanging from three eye hooked chains just to their inside, in my largest show room (Like this from about 1977-82).
If original, the KHorns are definate over achievers with their mediocre drivers. The L-300 were packed with really good drivers (in my opinion) that are sought after today. I would personally choose the JL's on that basis alone. Both had potential to sound pretty darn good if set up correctly. Hey, what can I say, during that period I was xclusively listening to a pair of Chartwell LS3\5a's that my competator sold me.
Agreed with CutThroat and others, likely a bad tube.I would check the input/driver tubes first as these have been the culprit for me in the past when experiencing this. Also COULD be the output tube as some EmmissionLabs 300b tubes did this to me. Small sparks passed from the screen to the plate when I drove the tubes REAL hard.
Hello,I can second both opinions: Lowthers are sensitive to cell phones, and the popping sound sounds like some problem with the amp, tubes or tube sockets. It might be bad tube contact; corrosion on the tube pins... if you unplug the tube, and put it back a couple times, that can take care of this.
good luck,
Do you own a cell phone? I had an interesting thing with lowthers and cell phones before. Try keeping it well away from the stereo gear. I would describe it as closer to a tick-tick-tick sound.
that the same thing happenned with some Bozaks I set up for her a few years back (before we were married).
I am guessing a bad tube. Swap a pair at a time and see if the sound moves to the other channel. When it moves, you have found your bad tube. I just went through this last month.
Cut-Throat
Thanks all for the advice. Turns out it definitely was a bad tube. Soon after posting I turned the amp on to change over the tubes and a minute after there was a loud bang and a flash from inside the amp followed by a very nasty burning smell / smoke leaking from the amp. One of the tubes had gone completely.Next thing is to find a good engineer to take a look and see if it's terminal or not. Sadly I suspect it is. In retrospect wish I'd exercised more caution but at least I won't make the same mistake twice!
You may have blown a (some) biasing resistor(s) - not terminal, just requires some simple soldering and an outlay on replacement components of < $1. Or probably around $100 if you get it done 'professionaly'.I used to run a Velleman amp that would let mme know when the EL34's needed replacement by doing this, just look for crispy crunchy resistors close to the tube base(s).
nt
Cut-Throat
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