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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy, et al, I got rid of my tube tester a few decades ago... yet I still need to match sets of tubes for equipment. When you consider many SE designs with no feedback loops, you need to match "sets" of tubes to get matched performance between ampli...
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[quote user="drdna"][quote user="Romy the Cat"]So, what I am talking about is ability for an amp to have some kind of inner-algorithm that dynamically and actively “color” or better to say “dye” signals, still maintaining general color-neutral tenden...
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[quote user="floobydust"]If you do some modeling you're running about 15.5 watts of dissipation on the plate and pushing over 4.5 watts output. Running the higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load results in hig...
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Sorry I'm a little late here, but anyway... here's something that may worth trying. Apologies that I can't provide a schematic at the mo - I can sort this out later if you like. In the meantime, you'll need a pen and napkin to help visualise this:The...
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peter wrote: By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF response, or a tu...
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I looked at the schematic for Herb's 300B SET many years ago. It's been copied and slightly modified by many.... personally, I would not use it for a 300B amp... then again I probably wouldn't use it for a 2A3 or 45 either (I think my input/driver d...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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[quote user="joaco"]Hello all , i know this topic is almost about pp experience but since im experimenting with electricity i like to share some thoughts here . I builded a dac using very high quality components . As you know the power supply is crit...
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[quote user="Romy the Cat"]Hey, Chirag, long time no see. [/quote]Hi Kitty,I always try to see whats going on on this site, but by the end of the day I'm usually too bloody tired to think clearly enough to write something of interest. This week...
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Well, have a good time, Stitch. Generally as far as I know Lamm equipment not modified a lot. When I own Lamms I make some minor changes that were not modifications but rather accommodations to the needs of my particular playback.
I would say that ...
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[quote user="Antonio J."] The builder regards VR1 more like an "offset to 0" adjuster than a bias control for the 6E5P since its working range is quite narrow. He asked me to know from you if along the 6E5P's lifespan it needs further adjustment...
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An Audio Amplifier Design Philosophy
By David Berning ( Courtesy Meta-Gizmo.com )
I became interested in audio at a very young age because I liked music, but was too uncoordinated to be able to p...
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[quote user="decoud"] Romy, can you be persuaded to post a sketch of what you think the optimal 2 channel Melquiades circuit would look like? [/quote]
Decoud, I do not think that there is such a thing as optimal DSET. The entire concept of DSET is a...
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Splitting the Lamm ML3 thread: http://www.goodsoundclub.com/TreeItem.aspx?PostID=3595
There are some people who worship direct-heated tubes and attribute to them some ventures (like absent of higher harmonics and a special micro-fineness). The...
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[quote user="Cosmos"] Anyway, as the description on our site on second paragraph says, the third 6C33 located at the back, is used as the pass element of the regulator (controlled by solid state circuitry) providing 220V with 100uV of random noise &a...
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Floyd,
Regardless your preamp uses output coupling cap you would still need a positive supply. Positive supply compensates the negative DC voltage at the amp’s input. Theoretically if you do not connect or disconnect the cable between your preamp an...
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[quote user="Romy the Cat"]
[/quote] Funny it took 2.5 hours to build the San Audio Kit for 6E5P. The 6E5P is at 150V (a bit low for it but it is OK), loaded with 15K and coupled with 2A3 via a cap. The 6E5P is biased with one 3.6V lithium ba...
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[quote user="morricab"] You are also right that to get everything you want from an output transformer requires a VERY expensive construction and top materials. However; even an expensive transformer is no guarantee of success. [/quote]
Sorry t...
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Romy, Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Your first ...
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[quote user="drdna"] However, there is something to be said for the certain magic that can sometimes happen with a particular device. The unpredictable transients and color shades add a sense of alive-ness that seems separate from the standard charac...
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Hm, a German company Audio Valve clams that this new Assistant 100 amps has
“110 w sinus wave - 1khz / 1% dist. / 8 ohm load, per channel”
http://www.audiovalve.info/nav/assi100_en.html
That is bold statement even if you drive...
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I have to admit that I personally care less about powerful full-range SET amplifiers. I do not take their sound seriously, in fact I do not believe they are cable to do “right full-range sound” and what I see then I always imagine them with huge, bar...
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[quote user="Johann"]Hi Romy,i want to use the 6E6P-DR (triode mode) as driver in my tube 45 amp.I use a D3A (triode mode) with Anode choke at 180V, 12mA. Grid 2 is connected via 50 Ohm resistor to anode. Grid 3 (pin 8) is connected to cathode.Th...
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Since I was wondering at Soundstage site I come across Marc Mickelson review of Einstein preamp.
http://www.soundstage.com/revequip/einstein_the_tube.htm
I am not familiar with this unit and but there was in there something that “attracted” me in t...
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[quote user="Paul S"]So this amp would not have to deal with a crossover? One R and one L in the signal path, it looks like a headphone amp, maybe a dream circuit for a light piston, HF only, given no cap/coil load at the [ribbon] driver. [/quo...
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Yesterday I got two emails asking me about Lamm ML3. I replied as I usually do, saying that I that I do not practice in satisfaction in audio-consumer curiosity. Still, it made me to think again about a hypothetic amp around GM-70.I am not a fa...
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[quote user="KOTriode"] Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the reg...
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[quote user="Romy the Cat"] In here is not the value are important but the concept the you block DC not with capacitor but with an “active” resistor that backed up with positive voltage. BTW, eventually if you wish to go “kinky Milq” and have a v...
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[quote user="jessie.dazzle"]As a way of forcing myself to see the thing as a whole, I will start by converting this schematic to a 3D CAD model, illustrating each component and its relation to the others (with more distance between the parts than in ...
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This is very interesting subject.
I expect that tghe new Midbass horns will have somewhere 108dB sensitively anechoicly. The driver is 99dB and the hyperbolic curve has much more EQ then Tractrix and that is more important the EQ that work mu...
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