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In Reply to: RE: +1 posted by drlowmu on July 13, 2014 at 14:05:18
I like your response, because it implies that you don't know the reason why one rectifier sounds better than two in this application, which is fine. I wondered only about the part of your original statement that implied you do know the reason (or that Dennis might know it): "low powered SE amps with high mu driver tubes ...will "sense" the paralleled rectifiers' mis match".
I was skeptical about this stated mechanism, not about the accuracy of your observation.
Follow Ups:
Hi Lew,If I use UNeven wires to parallel two 120 VAC windings on two high powered Signal-brand power transformers ( 10 A. secondaries ) that run my chintzy CD player, it sounds "skewed and NOT as good" to me. When I use equal wiring from my AC source, a "star" wired implementation, with 11 AWG Fulton Brown speaker wire it sounds very good to me. YMMV. See my photo.
When you have high sensitivity speakers ( 100 dB or more ) one can really hear whats going on !!!
Allows you to do a better tube design implementations. The dudes listening to with 95 db speakers will not be able to sense it as easily, often times not at all, due to marginal speaker sensitivity.
Its never ending, makes audio a FUN hobby to try to get it right.
Jeff Medwin
Edits: 07/16/14 07/16/14
Dude,
I'm all for trying new things out,but let's see some circuit protection.
Unless I'm just not noticing them,I don't see a single fuse anywhere.Being in the electronics tech business by profession,I have seen some pretty nasty electrical fires.Believe it or not,they can start very quickly and spread pretty fast before you have time to find the proper fire extinguisher.We all have our "fetishes" and "obsessions" about how our circuits should be built but overload and fire protection should come before anything else.Remember,the circuit breakers in your load center are only there to protect the wiring in the walls and cielings in your house.They are not there to prevent your DIY projects from arcing and sparking and turning into aurora borealis.
Hi,
Good point. Look under the AC swich I added on the far left top side of the chassis, in the corner, on the rear panel. Under the toggled portion, is an AC fuseholder assembly. See the fluted rear cover? Its in lieu of the stock fuse holder on the board, which is vacant as it would be redundant.
The AC switch ( On-OFF-On ) allows me to start the unit with a fuse in place, and for my own critical listening, and ONLY when I am in the room, I can bypass the fuse with a switch at my discretion.
I don't recommend others do this, it just works out OK for me.
This is self-delusion.
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