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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Well, they technically not Lpads but juts regular attenuators
even though they connected in “protective mode”. You can go with stabilized impedance
to maintain the high pass filter over the coupling capacitor to work properly
but I do not feel it ...
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[quote user="Romy the Cat"]Well, they technically not Lpads but juts regular attenuators
even though they connected in “protective mode”. You can go with stabilized impedance
to maintain the high pass filter over the coupling capacitor to work prop...
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people cant handle that it must have no cathode resistor. That r2 must be 15k. that gas tubes must be used but not for regulating voltage. etc.etc. well if you want good sound anyways. I think many people probably have built it. It is so ridiculous...
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Ok, the Milq MF DSET is well laid out. I have ordered a few parts and it will be on it’s way. I’m still contemplating what kind 400V cap to put right before the DHT tube in B+. I have space and I might go do film cap but I am not sure. Still ...
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Romy, What you say about both series and parallel filters is true. The parallel circuit does eat transient response, but if you keep the minumin impedance higher, it does not stress the amplifier so much. For your 16 ohm woof...
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You are in a position now that I have never been in: with plenty of "FR" gain, able to home in on exactly the "wide band" sound you want, with no real need at all for FR.Who could resist trying the old 45 or 50 in this situation? Lose (or loosen up)...
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The hell of it is that you will probably have to peck away at working out your plate and cathode OPs at the same time, since measuring resulting values is a lot easier than actually predicting them. Or, you will probably have to do this if you w...
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Thanks Bud!We often underestimate the fundamentally very physical way that sound is produced in our stereo circuits in complex electromechanical ways. I agree with Peter Belt that circuits are affected in ways that can be more adequately explai...
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I have some ZVN0545A mosfets here for exactly that purpose of replacing cathode followers. You may like to try this starting at 2mA (250V supply, 125k biasing resistor). Did you or Dima try Soviet SSG silver-mica for the first coupler? I am using 0.1...
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Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can obtain 1 V or little le...
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Yes, it worked in the same way AN do in theirs DACs. They usually use AD1865N (18bit) but with 44.1/48/96KHz (locked at 96/18 IIRC) input capability and if the customer really wants they can make it read 192/24, but still locked at 18bit and always w...
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i checked out this product from your link(thanks).for digital inputs they show aes,spdif,toslink and bada,which i understand is for use with the rr hrx 24/176?.also there is no clear indication that the attenuation is achieved in the digital domain.t...
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[quote user="coops"]Romy Hi sorry to have wandered off topic, I am listening at the moment to an MSB Platinum Dac III, hoiping to get the lavry back for comparison, I believe the MSB is multi bit based on a ladder resistor , with 4 24 bit DAc m...
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[quote user="Ronnie"]The next big problem with sound here I think is a difference in sound level between upper bass and MF/HF.Upper bass seems louder (and ought to be). Would you help this electronics-handicapped guy to pad down the upper bass horn w...
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Hi Romy,On my to-do list is a single ended version of the F5... essentially just the upper or lower half of the schematic, with a load resistor to opposite power rail (or perhaps a low DCR SE transformer) replacing the complementary portion.Alas it's...
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HiI'm now at a stage of building the chassis for full range Milq.It will be a two chassis,one power supply and one signal,very similar to Romys super Milq layout.The two will be connected by two separate cables AC and DC.A few questions please1.How a...
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Paul, would you think 6336 will be more stable/predictable?Have you had any experience with it?30H: sorry, forgot to mention that the PP pair is autobiasedwith a common 900R resistor...EL34: indeed it's a very popular tube for driving Stax electrosta...
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N-set, clearly you have a much better understanding of electrical engineering than I do (as do most of my pets...)! Still, I am hardly terrified by tank circuits, just wary of inter-component/PS/signal mosh. And I really don't care what sort of div...
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I found that cable cookers do not work on Dominus. You have no idea why. Nothing got “ruined” but Dominus juts do not react to cable cookers. It sounds ridicules but it is what it is. Dominus should be burned in ONLY being plunge between the actual c...
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[quote user="Paul S"] Any ideas for sources for 6AK5 and 5651A? Seems like most of the ML2 tubes are "hard to find" from local sources. [/quote]
I do not know why you say it. Both 6AK5 and 5651 are very common and very inexpensive tubes. The 6...
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Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, not much power and...
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Nope, sorry, it does not make any sense for me. The use of Rowland amp I guess is fine if it being use for testing of the filters. Still if you use high-pass for your midrange horn then what resistor does in your RC filter? A first order filter, rega...
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Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
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The issue I see is that of intermodulation distortion on the biasing of the output tube. It will effectively change HF operating point per supply ripple. Easy to understand if one imagines a gross ripple of 50V. Same thing happ...
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[quote user="anthony"]That is what I
meant, an ammeter for the DHT plate current. I don't see that the plate
current is adjustable anywhere in the circuit, and you don't show the meter in
the circuit diagram so I wondered if you actually used one...
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Hi Domidaw ! The first thing that we need to find out - is a REAL tube plate current at the moment when the R22 resistor starts smoking . I mean not a calculations that might be based on some faulty conclusions but a real current that an ammeter does...
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I replaced all the wires, replaced the capacitor C11, C10, returned to the 12w resistor R22, also replaced the L2 choke. Now I sit for over two hours next to amplifier, just like sitting at the bedside of a sick loved one person.
Nothin...
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[quote user="Romy the Cat"]I think it is about right. The 6C33C for upper base has 100K
biasing resistor and 20K to ground in Lpad. That would make ~60Hz. This high
pass that unload the LF from the horns that it can’t handle is very important
as y...
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It look like the project progress well. I have a little concern
about heat the will be building up in your PS enclosure. I do not know what
kind ventilation hole you have in there but be advised that it will be quite
hot. In worst case you mig...
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Maybe if you didn't try to pull the caps down so fast. Why the hurry? Maybe a 500 ohm or 5k ohm resistor would be a more kind bleeder. I think the peak current spike is not such a good thing for the capacitor. You are also at ...
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