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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="RF at Ona"]Romy and friends,Reading about the sensitivity of your system to electrical power supply problems reminds me of the days when I used to make my own equipment as much for the learning experience as for the final result.One of t...
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Great, thank you very much
for naming your amp this way, it means a lot to me. The two tiers configuration
is of cause an option, my full range Milqs were in a way two floor amps with
all magnetics sit on the second floor. In my case the magnetic ...
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One last thing I can do is buy some Mu metal sheet on Ebay and lined up the transformer can and potted with wax as you said, but that's too much work and probably do not work as well as on a separate chassis, so for now I will listen the way it is an...
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A local guy asked me that since my low-powe, full-range Milq is sitting in my storage and I do not use it then he would like to try it: he has 1110dB sensitive speakers and SET and PP amps. I figure out that if I give the Milqs to him now then I wil...
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Measet, I will try to find a photo and the schematic as you requested, but it may be a while before I can locate them. Plus, we are still digging out from Hurricane Irma down here. As I recall, I beefed up the raw D.C. supply and then used an LM317 r...
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[quote user="Bud"]All transformers are phase inverting. The lowest leakage point of primary and secondary windings relationship to conventional E/I and C core is the physical start of the helical spiral winding. This is assuming more than one layer o...
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[quote user="Stitch"]I listened to those some time ago. It was a full Lamm combo with ML3 + LP2 paired with Wilson Alexandria. This Doc from the WBF Forum never missed a second to tell the world how super this combination is. Above the holy grail. I ...
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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...
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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), ...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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[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 ...
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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...
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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...
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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...
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[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...
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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...
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[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...
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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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