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It's a 36W clone similar to the one below. I had considered the parasitic problem and then totally forgot about it. I'll try a cap across the PI plates...
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EL84 Plate Voltage Oddity
I am troubleshooting a 36 Watt type amp with 4 EL84's fed by a standard LTP PI. When I got the amp the tone was very compressed and thin on the top end....
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After going back to Enzo's microphonic hand test I totally agree with him that the EF86 is in fact microphonic. To further compound the problem I have attempted...
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Actually the problem may be caused by the magnetic field being generated by one of the transformers interfering with the magnetic field of the speaker.
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See reply to Enzo post. By the way I am in total agreement with everything said in your post.
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Well there is no vibration because there is no audio signal going to the amp. This problem does not need any input to occur. In other words, with the chassis...
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More Data
I think that we may have been a little off base in looking at the root of this problem. It seems that the oscillation is occurring...
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Thanks
I am sure that you guys are right. The EF86 is bring driven by an R/C network similar to the AC15 and that is really hot. After looking...
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Odd microphonic problem
I have an odd service question. The unit that I have on the bench is an AC15 type boutique amp: EF86 -> 12ax7CF -> 12ax7PI -> 2xEL84 and EZ81 Rectum-frier....
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A212 Schematics
Does anyone have or know where I can get the schematics for the Sunn A212?
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I have been using spray nitro lacquer from Reranch for quite some time. I have found that the spay goes on quite a bit more evenly than brushing it on. ...
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