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Re: I can prove it!!

Posted by Doc B. on July 12, 1999 at 14:12:05:
The particular high ( on the order of 10-20 mV)amplitude but very quick single reverse recovery spike that the UF4007 produces is actually easier to squash than the higher order spuriae from the HEXFRED. I think Buddah is going to look into the MUR, but I haven't heard any result, nor tried them myself.
With regards to listening to tube rectifiers vs. solid state-
I imagine I've listened to and used more types of both than a lot of people. I think that if a person wants to use a tube rectifier because it makes the sound the way they want it to be, more power to them.
The issue in the case I made was that a guy came to me and said, "Hey, why is the bass so soft?" I suggested a reason, a change was made, and the result seemed to support my suggestion, that's all.
To further this line of thinking, I will throw out the challenge, "How many of you have looked at the waveform of the various devices on your scopes, as well as listened to them?"
Assuming that a smooth waveform is what we want to see, devoid of any higher harmonic stuff, the results of such a comparison seem to show that the filtered UF4007 looks very smooth clear up to the tens of megahertz at least, quite similar to a typical tube rectifier. Lynn Olson and Matt Kamna did an interesting study of the waveforms coming off various unfiltered tube and SS rectifiers and found that the one which showed the least "glitch" ( they say even tube rectifiers have some form of "notch" )was in fact a TV damper diode.
Sooo, may be time for tube rectifier lovers to reconsider on those GZ37s and Mullard 5AR4s and add an extra tube socket for a pair of damper diodes... My own experience has been that the damper diodes are smooth, but still suffer from high impedance, and that the bass from an amp using them, while voluminous, is still on the slow side. YMMV.