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Read the Post in new Window Read the Post in Threaded view  Post #1737: Neutral Bus Stand-Offs? by Paul S on 2020-11-14 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
Jarek, what you describe can happen if anything with voltage touches the chassis, or something might be arcing across a very narrow gap. I have seen part leads that went too far through PCBs, also carelessly fitted stand-off. Even the axis of a choke...

Read the Post in new Window Read the Post in Threaded view  Post #292: I am NOT suggesting this (c'est ne pas une pipe) by Paul S on 2009-02-20 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
Truly desperate scofflaws might find themselves so annoyed by the hum that they lift the PP2000 AC ground connection at the PP2000 chassis and run that unit's ground only to a dedicated ground (with a lower impedance, of course), ...

Read the Post in new Window Read the Post in Threaded view  Post #75: Just have to build one to hear. by KOTriode on 2012-03-17 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Ok, I just read your "Melquides Remote biasing". This technic can not be duplicate in my amp due to DC coupling, the C3G (I dont use 6E5P) driver stage basically adjust the 6C33C current in the output stage. Just for curiosity, I will build a mono bl...

Read the Post in new Window Read the Post in Threaded view  Post #80: New 6C33C SE amp at clipping. by KOTriode on 2012-04-06 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Amp at close to clipping level 20.4W, I am surprised that sine wave looked pretty symmetrical. Still has couple chassis left for the Melquiades, the problem is the 400V supplies which required extra power supplies. This interstage amp is so much simp...

Read the Post in new Window Read the Post in Threaded view  Post #90: DHT Meter by anthony on 2017-02-25 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
Romy, do you have a panel meter on the DHT channel?  I am currently designing the chassis for my DSET and looking at your schematic there is no panel meter for either driver or DHT.  Just trying to figure out what would be useful to have in my amp.Re...

Read the Post in new Window Read the Post in Threaded view  Post #96: DSET amplifier is designed by anthony on 2017-04-05 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
It took a LOT of time in CAD using what I had learnt from building the power supplies and then adapting it to match the requirements of the rest of the system.  I have decided to mount the DSET on the horn stack and direct connect the speaker cables....

Read the Post in new Window Read the Post in Threaded view  Post #4: Sorry; "Current Amplifier" by Paul S on 2018-10-26 
Browse the content of the threads in new Window  Thread: 43.7 Times the Price of Gold in Audio News  3 Replies 
Correction:  The CH brand phono stage I looked at is (of course) a current amplifier, and no reason to be curious about a regular old, typical voltage amplifier.  I see there is also a VERY Expensive, 4-chassis version of this (already expensive) pho...

Read the Post in new Window Read the Post in Threaded view  Post #7: Building the Melquiades: #2 by Romy the Cat on 2006-06-20 
Browse the content of the threads in new Window  Thread: Building Melquiades: Chronicle of full-range in Melquiades Amplifier  44 Replies 
OK, the next step is kind of done. All transformers and chokes are done form “outside” of the amp (under the bulge). I have attached the capacitors and the output transformer to the “inside”.  This silicone attachment that for the computer grade...

Read the Post in new Window Read the Post in Threaded view  Post #8: "...better and more sophistocated PS" (vs. bad AC) by Paul S on 2007-11-25 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
Romy, I have noticed the same thing with the phono stage power supplies, that the big multi-chassis units with dual 100 lb. PS get no overall sonic advantage, all said and done.  So how do we deal with the stupid, lousy AC that is too often...

Read the Post in new Window Read the Post in Threaded view  Post #32: Buy It Now! by hagtech on 2008-01-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
I'll buy some more 7788 and give them a try.  I'd hate to change tubes at this point.  My triode connection has pin 8 (g3) to anode, not ground).  I wonder if that makes a difference.  Also, the power supply chokes are nearby, per...

Read the Post in new Window Read the Post in Threaded view  Post #27: Well, I hope you will at least listen to it... by Paul S on 2007-05-23 
Browse the content of the threads in new Window  Thread: I need a “second-type” phonostage. in Analog Playback  38 Replies 
before you gut it. How funny would it be if it turned out to be any good, or even not bad?Since they all seem to need endless hours of tweaking, who knows, maybe you've got something here.In any case, the chassis looks quite solid, and the indus...

Read the Post in new Window Read the Post in Threaded view  Post #306: Buzz-kill revisited by jessie.dazzle on 2009-02-22 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
Romy wrote : "...What I would do next is to lift ground at the 2000PP input – and then ground the PP2000 to your own ground. Make sure that no other devises on your playback use the main’s ground..." drdna wrote : "...I did this already; it...

Read the Post in new Window Read the Post in Threaded view  Post #7: Melquiades For Dummies™ - planning and ordering parts step. by Romy the Cat on 2007-10-02 
Browse the content of the threads in new Window  Thread: Melquiades For Dummies™ - step by step. in Melquiades Amplifier  28 Replies 
Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...

Read the Post in new Window Read the Post in Threaded view  Post #24: Re: Lower voltage by hagtech on 2006-07-08 
Browse the content of the threads in new Window  Thread: Building Melquiades: Chronicle of full-range in Melquiades Amplifier  44 Replies 
Interesting results.  Funny thing about that sweet spot.One thing you might try is to add the output from a 12.6V secondary to the primary side of the B+ tranny.  Out of phase.  This can be a resonably small transformer that could fit ...

Read the Post in new Window Read the Post in Threaded view  Post #39: Beautiful Amp by hagtech on 2009-08-29 
Browse the content of the threads in new Window  Thread: Building Melquiades: Chronicle of full-range in Melquiades Amplifier  44 Replies 
I agree, I like the idea of glue or resin to attach components to a chassis.  It adds a nice layer of damping material.  I used to to this with step-up trannys for mounting in a box.  Works great with the Cinemag or similar style cans.jh...

Read the Post in new Window Read the Post in Threaded view  Post #15: The hard-boiled PP with confined 6C33C by Romy the Cat on 2010-01-22 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
I see, what they did – the built a perfect sealed chimney with two fans to suck cold air in and two fans to suck hot air out. Well, it might work, even though I do like this idea. I absolutely do not see why such a hot and large tube as 6C33C sha...

Read the Post in new Window Read the Post in Threaded view  Post #54: Observe the sound… with your brain or ears? by Romy the Cat on 2013-12-04 
Browse the content of the threads in new Window  Thread: Mastodont DIY Rack: Wall Mount? in Audio Discussions  68 Replies 
[quote user="N-set"]Rings=poorely damped, due to its crystaline structure. Take a granite tile with two fingers, put your ear close to it and knuckle. Observe the sound.Repeat with other stones to compare. For that reason it's neither used in nanolab...

Read the Post in new Window Read the Post in Threaded view  Post #115: EM radiation by anthony on 2017-04-17 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
[quote user="Paul S"]Anthony, it sounds like you have given a lot of thought to damping structural vibration.  I was referring to the electro-magnetic fields thrown by transformers, and - based on my view of your perspective drawings -  I was wonderi...

Read the Post in new Window Read the Post in Threaded view  Post #1: My Koshka is meowing by Tax on 2015-03-01 
Browse the content of the threads in new Window  Thread: My Koshka is meowing in Melquiades Amplifier  13 Replies 
Finally listening to my Melq which I have named Koshka!Here is a photo of my two tiered wooden chassis which I tested before sending it back to the cabinet maker for sanding and oiling.Thank you Romy for your blog and making the schematic available t...

Read the Post in new Window Read the Post in Threaded view  Post #1474: The AC polarity problem by clarkjohnsen on 2015-11-23 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
This may have been mentioned already. . . if so, it escaped me. But here's the thing: Each component has its own AC chassis leakage characteristic. This can be measured, and lining every component up by the same polarity produces less noise & hum...

Read the Post in new Window Read the Post in Threaded view  Post #1736: GND dances by N-set on 2020-11-12 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
Anthony, I didn't realize the potential of your remark, thank you. The chassis has been tied to the signal GND already at the birth as otherwise the phono would develop noise even off the wall. I have to go throroughly with a scope to see where the n...

Read the Post in new Window Read the Post in Threaded view  Post #22: "High-End"... An acquired taste by jessie.dazzle on 2007-07-26 
Browse the content of the threads in new Window  Thread: Audio critique – open your mind! in Playback Listening  44 Replies 
Hello Romy and friends,With regard to constructive criticism: At the risk of stating the obvious: Not many people (audio manufacturers included) have your level of references with regard to both sound and equipment (to say nothing of musical cu...

Read the Post in new Window Read the Post in Threaded view  Post #967: AC polarity and Bybee crap. by Romy the Cat on 2011-12-26 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
[quote user="steverino"] You have an unusual situation because you have so many dimmers (one type of device). [/quote]Well, the unusual situation is only as experimentation. In the house I bough pretty much etch light switch had a dimmer. I have ...

Read the Post in new Window Read the Post in Threaded view  Post #2: Building the Melquiades: #1. by Romy the Cat on 2006-06-09 
Browse the content of the threads in new Window  Thread: Building Melquiades: Chronicle of full-range in Melquiades Amplifier  44 Replies 
Ok, it took 2.5 hours to mount the transformers and chokes. The transformers above are filament transformer and high voltage transformer. (The super Melq has all high voltages coils as separate transformers). The 3 chokes above are input chokes for f...

Read the Post in new Window Read the Post in Threaded view  Post #158: First music testing by anthony on 2019-01-31 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
So, the first DSET is still downstairs on the electronics bench and I am back to work for a while, but not too hard and not for too long (I hope).  I've added all the filters and checked and tested and changed some more things and decided that it was...

Read the Post in new Window Read the Post in Threaded view  Post #2: The chose of the firewall material. by Romy the Cat on 2007-04-02 
Browse the content of the threads in new Window  Thread: Building “Zarathustra II” amplifier in Audio Discussions  8 Replies 
[quote user="hagtech"]Yes, steel chassis can be both good and bad.  It likes to conduct magnetic fields, so you have to treat things appropriately.  A little spacing under a choke can go a long way.  Otherise you have a 120Hz motor.&nb...

Read the Post in new Window Read the Post in Threaded view  Post #172: Specs TechDas Tables One and Two by Stitch on 2014-05-19 
Browse the content of the threads in new Window  Thread: Ultimate Turntable in Analog Playback  220 Replies 
Specs for TechDas AirForce One Air bearing main platter 19 kg of non magnetic SUS316L stainless steel  Upper Platter of choice A7075: super duraluminum 3.5 kg SUS316L: 10.0 kg Acrylic resin: black methalcryalate 1,5 kg All those upper pla...

Read the Post in new Window Read the Post in Threaded view  Post #5: Power-to-weight by jessie.dazzle on 2010-10-01 
Browse the content of the threads in new Window  Thread: “Why horns”, years later. in Horn-Loaded Speakers  4 Replies 
Romy wrote:"...a chassis designer told me. It is now possible to buy normal efficiency drivers with low mechanical loss..."Sure it might exist, but I question the application.First, a bit of the obvious:Consider only the driver; not the amps and rela...

Read the Post in new Window Read the Post in Threaded view  Post #193: Daisy chaining, unfortunately by Romy the Cat on 2011-01-29 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
[quote user="jessie.dazzle"] Scrolling down to the images of the Lamm ML2.2, I see something that intrigues me... Four ML2.2s are used to bi-amp the Verity Audio speakers; I didn't know they could be daisy chained by using both the XLR and RC...

Read the Post in new Window Read the Post in Threaded view  Post #1075: PP+ issue by SOS on 2013-01-13 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
First as stated before, when I 1st received the unit no hum issue it was after it was sent back twice that it came about. 2nd if I use my other conditioner, a Purist Audio Design all is dead quite. The humming out of the speakers stops if you plug th...
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