Click to expand.Bear in mind that thermionic rectifiers don't usually fail short circuit and silicon rectifiers usually do.A fuse might save the mains transformer from such a failure - but its a thin margin between reliability and blowing when it needs to.A tube with grids can short relatively easily - it takes a pretty catastrophic failure to cause a short in a rectifier tube.Failing short circuit is very easy for silicon rectifiers. You need single diodes with a substantial voltage safety margin - or series diodes with parallel balancing resistors across each diode to swamp out leakage spread and unequal voltage sharing.Avalanche protected rectifiers might be OK in series - but its not something I have hands on experience. Well guys, after a bit of digging and trouble shooting i have it back to what I believe is norma volume. Now I am just making some modifications to make it more my style. It has was too much bass which I figure I can change those two.12 coupling caps to.022 to allow some more treble through but the distortion also sounds pretty crappy as in it is buzzy and not very smooth.
![Special Special](http://www.pmillett.com/images/807pp_pics/807pp_is.jpg)
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But the beauty of transformers is that they allow us to have more than just one winding in either the primary or secondary side. Transformers which have more than one winding are known commonly as Multiple Winding Transformers. The principal of operation of a multiple winding transformer is no different from that of an ordinary transformer. Primary and secondary voltages, currents and turns.
I would usually say a low pass filter would help here but i don't think so because it would cut more highs when I already need more of them. It sounds like it clips and is not very smooth. Preamp gain purely mind you. When i roll back the treble knob it does smooth out but it sounds muddy and very off then. If i changed those coupling caps to a lower value, therefore letting more highs through but cutting some right after the preamp (where the distortion is coming from) with a low pass filter would that help? I can smooth out the preamp gain while getting more highs. My theory is since those coupling caps are so large it is cutting all the highs but the preamp still has that really spikey distortion so that defeats it lol.