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Post subject: Re: WHINE - supersonic 22
Posted: Fri Dec 07, 2012 12:25 am
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Show off. :lol: :lol: :lol:

Gonna have to read that article you linked to. :wink:

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Post subject: Re: WHINE - supersonic 22
Posted: Fri Dec 07, 2012 9:37 am
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BMW2002Ti wrote:
Ok... AFAIK, good quality non-polar bypass caps helps in reducing switching noise in units with earlier 1N4007 or older selenium style diodes. You can eliminate these extra bypass cap by using more modern ultra-fast switching diodes (like the UF4007).

If you want a stout PS, that is quiet --- you need to work-up a good power supply software simulator. And I'd use chokes as well as good caps and low-inductance resistor (like ww Mills). Problem is, a good choke needed for the output is gonna be big (maybe as big as the PT) and $$$. But, you'll have a PS that is rock steady and last forever.

PSUD2 is a simple program to silmuate load and ripple:

http://www.duncanamps.com/psud2/download.html

See Part 4, of the link:

http://sound.westhost.com/articles/capacitors.htm#4.0


One step further, would be the use of quality motor-run non-polar caps. Believe me, motor run cap and good choke or two will give you clean power with instant transient response.

I don't like those bits on the Net about raising the cap mfd to "infinity" to get clean power. Not without a good feel for the effect on time-constants. Too much capacitance can lead to slow transient response and crazy in-rush problems (prolly the reason for using a CL, current-limiter in many poorly designed PS units).

Reminds me of all those "experts" making humungous power supplies for car stereo sub-woofer units. Like 10,000 to 25,000mfd / 100 VDC cap cans. These can blowout your car's ECM if the warm-up isn't relayed or the wiring shorts out.

Anyhow, just my 2¢ worth of 2¢ :lol:


"motor-run caps".....ha ha ha when i worked for AT&T Dupe on Highland and pimped out to A&M on La Brea (i did not care cuz i had to pass by Pink's) Ted was the dude that owned AT&T and a tweak. I took over his "lab" he had me go through all electronic stuff i the house changing caps, going to Op-Amp labs for discreet octal op amps blah blah...kissing machinist butt to roll up some incredibly heavy flywheels for his Ampex two tracks he used for cassette dupes, we recorded rockline in our studio and that was all distributed via cassette....trouble is...Hollywood in dead of summer from sun up to sun down had horrendous ac power...and were a dupe studio...need stuff to stay at the same rpm..or ya had a flanger cassette....Ted took me to all the places ...one day after hearing a dupe that sounded like the cat was playing with the reels.... he said Roland...i want an auto transformer and DC power supply (helps with the brownouts but not the freq's which could vary an itty bit...also not good for motors. and there was a place in universal studios/north Hollywood a surplus place...and i found all of this military crap from the civil war...HUGE motor start caps oil filled of course, a auto tranny that took me and my mechanical cohort to get in the porsche (930) killed turbos almost bi weekly.... anyway and big herking wire wound variacs and some just spectacularly HUGE knobs ..like something you would use to dial in a howitzer.....or the mad scientist about read to start a heart in a B movie.....

built in my really new girlfriend's garage at night all noisy and mad idiot like...and built this powder coated monstrosity of a power management device...Ted had to pick it up in Reseda in a PU he borrowed my GF, her old BF me and Ted picked that thing up i had it on sawhorses......and it worked great and Ted fascination with 28 pound aluminum platen flywheels....we were getting good quality dupes at 12 noon when the air conditions are cranking...that was late 70's BIG A%^ed oil filled caps...had t weigh in excess of ten pounds each. :mrgreen:

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Post subject: Re: WHINE - supersonic 22
Posted: Fri Dec 07, 2012 9:43 am
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bluesky636 wrote:
Good article on why eliminating power supply ripple in a tube amp may not be a good thing:

http://ampbooks.com/home/classic-circui ... AB-ripple/

Here's the complete study for a little bedtime reading:

http://www.emsp.tu-berlin.de/fileadmin/ ... se_NTl.pdf

Oh. I neglected to mention its in German. :lol: :lol: :lol:


Well rocker my old lady is German.....works pretty good as a translator...course can't tell if she lying to me or what she is saying when she is cussing me out...33 years -gona have to read it...

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Post subject: Re: WHINE - supersonic 22
Posted: Fri Dec 07, 2012 9:45 am
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BMW2002Ti wrote:
Deutsche Sprache ist kein Problem. So lang wie gibt es keine Mathe im Artikel.

Aber um jene ripple Wirkung. Oops! About that ripple effect. An excellent article. Similar to Valve Wizard's:

http://www.valvewizard.co.uk/smoothing.html

Not many ppl have a good handle on time-constant and its effect on overall response of an amp.

Auf Wiedersehen!

:lol: :lol:

I would expect that from a Beemer flyer :cry:

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Post subject: Re: WHINE - supersonic 22
Posted: Fri Dec 07, 2012 8:07 pm
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rollo, I'm an anal type. WW2 history is my 2md vice. And proofreading German docs. [insert wired-@ss simley face] LOL!

Chekc this photo out. With proper by-pass mica cap and hand-wound choke. By the size of those leads, should be able to handle any guitar amps transients.

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Post subject: Re: WHINE - supersonic 22
Posted: Sun Dec 09, 2012 6:15 am
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BMW2002Ti wrote:
rollo, I'm an anal type. WW2 history is my 2md vice. And proofreading German docs. [insert wired-@ss simley face] LOL!

Check this photo out. With proper by-pass mica cap and hand-wound choke. By the size of those leads, should be able to handle any guitar amps transients.

Image



Intriguing..WTH are we looking at? an amplifier PS or some relic from a B-58?

I was WWII fanatic for decades...i have a true dec 7th survivor living across the street when in town and a retired rear admiral.....did forward air control at Inchon.....

I had a group of Germans to my facility...so later i took them to Don The Beachcomber's in Malibu dragged the wife along - turned out that was a good thing she was quite the ice breaker...and Zombies helped

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