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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Contemplating now how to organize biasing for 3 singe stages of my 6-chanls amp I was faced the dilemma: do I need to bias my tubes. The 6E5P/6E6P are Russian tubes and it means that are very different right from the boxes. The Milq, driver tubes, be...
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Romy,Thanks for the info on alternative manufacturers.
The resistors I found locally seem to be working super well (precision metal film... didn't ask who made them...they are all black and cost EUR 2.80 each). I may eventually replace these with RN...
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Yes, the laconic clarity is too rare and too worthy to let go. My limited experience suggests that the 45 may have this very special ability, taken alone. Conversely, the "good" 6SN7 is wonderful with respect to tonal...
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Romy,Using the Fullrange PS I have bread-boarded the Fullrange amplifier...Turn off the lights and it looks much better.To my surprise (this is my very first amplifier build) everything seemed to work pretty much straight away. The voltages seemed r...
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I'm thinking about trying to put together a Melquiades amplifier for myself. I printed out a copy of the schematic (thanks for sharing). I have a simple early question. Both the 12.6 and 6.3V windings for the filaments are shown as being center taped...
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[quote user="Kerry Brown"]I don't understand when you say active crossovers don't attenuate. Mine does. Very well too, I can trim channels to match each other perfectly. And DEQX volume control is 'analog' = step ladder resistors. [/quote] I am not...
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Had some fun experimenting with 6e5p driver stage.playing with difrent output transformrs and resistors found that the stage can drive a speaker with ground connected to air. mabye this is widley know i did not know. + of speaker connected to bad ou...
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then the idea of amp bypassing is relevant to the "clean signal" discussion. But regardless of the measured voltage out vs. driver sensitivity I suspect that there is too little of something in the way of drive and control between a&n...
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Romy,The only card that seems serious is the Creative Live Drive series. They have the capability of encoding at HDCD sample rates and also have a front panal input / output fascia with many conntrols and buttons to explore and screw up with. I have ...
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It's quite a marvel from what I can tell now. The overall sound is somewhat on the darker side but the preamp is still breaking in (although I gave it 30h benchtop burn in with the frybaby track). I also suppose it reveals the Dannoy and the room int...
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Good advice, to be sure.I have chosen the most "neutral", "tape-like" MC I have found, but of course it remains a phono cartridge/transducer... Meanwhile, I just checked VTF on a hunch and was annoyed to find that at some point&n...
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[quote user="hoan da ox"]Hello to all, After following the comments of Romy for some time (have learned a lot, thank you), I would like to ask a question on this subject.This circuit is built with resistors, diodes and capacitors. Could someone elabo...
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Yes, of cause I have experimented with the resistors quality. The way how the resistor
is used in the feedback loop in my view make is less relevant. The feedback resistor
is applied to high impedance source that make less signal to flow other the ...
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[quote user="AnonymousUser"]Thanks for your response! I have never tried grounding the cathode in any of my tube projects. Even my amp output stages have been mostly cathode biased. But I am going to try grounded cathodes (and the +/- input stage sup...
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Hello every body, I live in France and I'm new on this forum.I'm thinking to build (some months) a mono big Single Ended amplifier (200-300 watts) made with triodes (IDHT or DHT doesn't matter for me) for outdoor professional audio.Have you got an on...
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I run some sweeps on the new Melq. It looks like it is moderate, somewhere from 20-21Hz to 22-23Khz. Since I run the 6C33C at near 60W for now it is fun to see how it works. In the scope the repose and the distortion at LF looks kind of funny but I h...
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[quote user="zanon"]Romy:I was not aware that manufacturers of multidriver system let you attenuate individual drivers. I guess if you multi-amp, then you have control at that level. I have never encountered such a system so I cannot say, but if it i...
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[quote user="Romy the Cat"]And it is not that you can do it but it is a very common practice. Some manufacturers offer actuators of sometime tapping pads. I think even the largest Wilsons offer a set of series resistors for crossovers to attenuate HF...
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The pisser with the AC filaments is that they "sound better" in terms of immediacy and proper acceleration, and the sound "quality" with them is obviously more "lifelike". But too often the damn things are just plain noisy. I was thinking I remembe...
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[quote user="floobydust"] I … use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo from c.t. to ground) and use the balance pot with the bypass cap only to ground for adjustable AC balance. Regardl...
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[quote user="Romy the Cat"]Yes, you are right, the voltage divider from 6.3V across 47K and 10K resistors shall give not 0.9V but 1.1V. However, the numbers that are in circuit are not something that I saw in my dreams but the actual numbers that I m...
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I am not sure I follow the TV analogy...I think that the best course where any sort of voltage divider/attenuator is concerned is to do it without messing up the audible results, of course, but also to keep it as "neutral", "transparant" an...
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My DSET amplifiers are starting to go together (slowly).Bias string and bleeder relays/resistors...The remainder of the filter caps. The middle floor goes on and the filter cap for the First Stages (6E5P/6E6P).Then the OPT's go in place and the shel...
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Alex,
yes, the passive linestages (resistors) tend to be more transparent then active stages but it is only in the case when a passive line stage (attenuator) sits right next to the grid of your input tube. As long as a passive linestage b...
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Hi Romy,I too have for quite some time been on a quest for a truly transparent preamp. To this end I have tried some that were indeed very good such as the Silvaweld SWC 1000 that I now own and especially the Vacuumstate RTP-3d from Allen ...
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[quote user="decoud"]Romy, have you ever considered trying with your three dacs the following experiment. You take a digital file and runit through each of the dacs. You then take the output and feed it back to your adc. You then take the resultant r...
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Romy, at some point you did mention lowering current and shortly thereafter, if not in the same post, you added something to the effect of raising voltage. You even mentioned values you have tried, and I printed it out. But since I am usu...
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Yes, my friends called me that too, but hey, I can't help it, my curiosity on tube amp get the best part of me, plus I can't build enough power amp to power all my 3 tri-amp system. I collect all kind of transformer, just for the 845, I tried about 6...
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OK, I am keeping my new The Loudspeaker(s), and I will be selling my large "Diamond Edition BassZilla" OB speakers that feature OB high-passed Lowther DX-4s running wide range (NOT full range!) over 15" Audax PR380-M2 woofers in integrated BR boxes u...
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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 get hold of a scope to che...
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