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In Reply to: RE: EML solid Plate 45 vs. EML mesh Plate 45 .........better for SET ? posted by banpuku on November 10, 2016 at 05:56:43
Hi Pat,
Not sure why filament bias would do this - I have not looked into it.
Removing the cathode R bypass cap allows cathode-current feedback, which decreases gain, increases plate impedance... and decreases distortion. Some of the improvement you are hearing could be due to the reduced distortion.
A different capacitor could help (via a different mechanism) tune the sound to your liking. I have noticed differences between Mundorf's M-Cap and Evo Oil capacitors of the same value. My girlfriend noticed it too without being aware I had made the change to the system. Mundorf capacitors are not for me, me thinks. I will be using a Clarity MR in the cathode of my next build.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Follow Ups:
FYI regarding caps. I have tried a few, not Mundorf. Here is what I hear.
1. Clarity MR is very clean and has a non-natural sheen to the sound. Plastic-like for lack of better words.
2. Russian k40 is very natural and tonally colorful. Not as solid in the bass as the very best, but still very good in the bass. I really like the tone of this cap and use it in several places.
3. Jupiter Copper Foil Oil - very very neutral and natural. No tonal anomalies anywhere. It is a bit dry and certainly not as colorful as the Russian, but it also has no extra techni-color. I suspect it is as neutral as possible.
4. Duelund Cast PIO - I just put these into my amp recently. Only about 50 hours on them. Hard to say how much they differ from the Jupiter's. I think they are similar, but the Duelunds might have a bit more texture and color. TBD.
Hope this helps in your decision. FYI: I have some Russian, Clarity MR and Jupiter caps for sale (used). Just in case you want to try something for 50% off. Just offering.
Thanks for the info - could be helpful!
I don't know if cap "sound" is the same in each location, that is, does a cap sound the same in screen bypass as cathode bypass as coupling? I suspect not, but your feedback will be added to my notes.
The M-Cap was kind of dull but grainy; the Evo Oil is more "dramatic", but highlighted from the upper mids up, which seems to be typically Mundorf.
I have thought about Rike's new S-Cap 2 (not sure about Alu as a conductor tho) or if I win the lottery, multiple Audyn Copper Max... ouch. I need > 20uF and ~400V - not easy.
Thanks,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
I have tried Riken as well. Similar to claritycap with very little coloration. Good dynamics.
I too am looking for 70 to 100uF and so, if you have any ideas please let me know.
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