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In the Forum: Melquiades Amplifier
In the Thread: Full range Melquiades implementation
Post Subject: Debugging.Posted by Romy the Cat on: 11/19/2013
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Hm, it is interesting. The loud popping pings in the lower MF and upper bass region are unmistakably signs of the 6C33C be gunner. Then you replaced the tube and the pings are still there. It is very highly unlikely. You might burn a cap that intermittently sorting but it is VERY unlikely. If the pings are in the frequency region that I said above then most likely that your new tube was defective or you accidently put the old tube back to the amp. Do not feel that I consider you an idiot – I did it a few times myself. When the tube is cold go figure which one is old. So, when I pull the old tube from amp I cool it doe and put immediately into trash. In your case your old tube might somehow find its way back to the amp.
If the pings that you have are at slightly higher frequency then you might have a corona in your output transformer. Some transformers are not properly varnished and even as low as 200V that Mils has might create some temp shorts between the turns with time. Take the tubes from the another amp that has no problems and if the amp still does the pinging then disconnect the OPT and plug in any other transformer. A regular power filaments transformer for 12V will do. It will give you an idea if the pings are still there. If not then contact the transformer maker – they shall replace it from free.
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