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In Reply to: RE: SE 6CB5 : @ 23 watts anode triode mode , LSES exp. update posted by deathtube 667 on December 07, 2016 at 19:48:55
Nice breadboard. There was nothing wrong with the filter, except, you needed to do a separate L1/C1/L2/C2 for each channel. That way, you are running with half the currents, and nothing gets stressed in L1.A flywheel works because the typical Flywheel's 35 mHY L1 choke is usually rated a 2A., and it can absorb the high peak currents with a stereo load, on the less-than-critical-inductance choke input.
Many, 8 years ago, mis applied a LSES to a typical shared ( stereo ) supply. LSES was originally used in monoblock amps, to filter a single channel - with a TOTAL current draw of maybe 53 mA. Bumping filter current up to two channels, at 106 mA. or there abouts, is NOT an automatic possibility.
Even an inexpensive ( under $12.00 ) Triad C-40X ( 320 mHY at 10 Ohms ) will work with no problem, IF implemented as I suggest, for ONE channel's L1 only. A separate B+ filter ( and, for that matter - power transformer / rectifier tube ) will outperform shared parts sonically, in any decent amp.
Mikey Samra will confirm, a cheap 10 Ohm Triad C-40X is GOOD sounding .
In my latest ( 11-2016 built ) 2A3 amp, ( which I have been showing pictures of ), you will see FOUR chokes below deck, two for each channel. My L1s are only 210 mHY at 8 Ohms - filtering about a 55 mA. load, per channel. They run flawlessly that way, cool, no vibrations, etc etc.
Keep up the good work. Such a low DCR supply is AWESOME on ALTECS. have fun listening.
BTW, I have confirmed with DF, the LSES inventor, JUST last week, that when L1 equals L2, as in his LSES filter, the amp sounds the best to him.
Merry Christmas,
Jeff Medwin
Edits: 12/08/16 12/08/16Follow Ups:
In the MAC mono amps that run tube rectification are absolutely fantastic.
I have used them in place of the 150 ohm resistor coming off the 5U4 to the reservoir cap.I also use the .5hy at 30 ohms and those are very nice as well.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
"Even an inexpensive ( under $12.00 ) Triad C-40X ( 320 mHY at 10 Ohms ) will work with no problem, IF implemented as I suggest, for ONE channel's L1 only. A separate B+ filter ( and, for that matter - power transformer / rectifier tube ) will outperform shared parts sonically, in any decent amp."
No Jeff the Triad C-40x will not WORK at 53mA without buzzing!
It WILL work in a cap input supply. I've gone as low as 1uF before the Triad C40x.
Triad C40X will NOT work as "input choke" under any circumstances I've found.
Great choke for $12 though!
OK Rage,
In my November 2016 built JJ 2A3-40 amp, using about 55 mA per channel, I Thought I had used 320 mHY / 600 MA. Traid C-40 Xs, and had I had absolutely NO problem. But Rage, I was mistaken.
You MAY have been correct if you have direct experience. But I need to ask, was your Triad C-40X L1 choke just doing duty for one channel , not a shared channel supply, as you seem to indicate ??
I DID have 320 mHY / 600 mA. chokes in my newest build for L1, but instead of Triads, they were the same-rating Stancor C-2708s in there, ( NLA ) and Jeffrey confused the two chokes. My mistake. Thanks for pointing this out to me.
I think Mikey Samra used the C-40X in some duty other than as L1, and he told me how much he liked it.
Jeff
yes I ran the C40x first in my 2a3 amp, one PER channel not shared supply.
so dual LCLC.
input choke was C40x, second choke was your Heyboer 7 ohm model
they feed per channel 2a3 at 43mA and 12ax7 at 1/2mA.
They buzzed pretty good. Had to take them out and replace with Triad .035h and went flywheel.
If C40X worked I would use them for both positions and do the LSES that way rather than acquiring those Stancore chokes.
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