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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: Don't laugh too loud...Posted by N-set on: 8/30/2011
fiogf49gjkf0d
...this is my first serious attempt to pack something into a case.

 Paul S wrote:
Nice looking unit, N-set.  I also go out of my way to use part leads only in lieu of extra wire whenever possible.  I really don't care what it "looks like" on this score.  At least your wires are all nicely dressed.  You will find out soon enough if they are "properly" routed.


Thanks for kind words. I've been already listening to the noise it produces. On my Stas SR007 headphones,
full volume it's quite acceptable white noisecomming most probably from the input tube's thermal noise (I've been using cheap Chinese 12AX7 for the testing). More carefull test do show some 50Hz enviromental pick-up present in one of the channels. My (uncalibrated)
HP400F shows around 16mV noise with both the PSU and signal blocks without covers.

 Paul S wrote:

May I ass-u-me that the electrolytics that appear to be lying down on the Cu ground plane are actually raised up on some sort of di-electric stick-um?  And what are the little "blocks" on some of the BlackGates?  "Dampers"?  Have you tried fine Cu screen instead of plate in thermally-challenged areas?


No Black Gates here Paul! These are Elna Cerafines. The "blocks" are silicone-glued sorbothane restsovers for imaginative damping.
If you find it stupid, I'd probably agree with you. The caps are lifted above the Cu plane without any insulation exepct for the air
(why create additional caps using additional insulators?), but that's not critical I guess--one of the
legs is grounded anyway. I've lifted them mostly because the plate gets warm from the tubes and regulator IC's.
Actually, this is not visible but it took me quite some time and effort to bend and place all the parts/leads
in such a way that they do not touch each other and if possible cross at 90deg (with obviously some exceptions where it was not possible)
Not exactly understand what you mean by the Cu screen and in which areas? At this side of the chassis nothing gets really hot, the hottest
are the tubes at the other side.

 Paul S wrote:

You have probably already heard this before, but for PS chokes, the better Hammond are not only reasonably priced and easy to get, but they are consistently silent.


The noise not the problem here--my HV tranny is the noisest thing here, but still not annoying (you hear it from 0.5m without the cover,
which will be damped with a heavy rubber). I've used a better Hammong at the HV entry because of it's higher voltage rating
(and also secondarily to prevent buzz at it sees around 700Vp-p or something like that).


 Paul S wrote:

God...  we sound like (gasp...)  DIY'ers!


Shit...

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