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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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I like having a center-tapped filament winding for flexibility. First, you can use a traditional approach on hum balance (what you have now) or use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo...
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Yep, it looks, like very close to “it” design-wise. http://www.studiomaudio.info/loftinwhite.htmlIn the way this amp is one of the manifestations of Loftin-White DC-coupled but it has some own things. The driver stage is the Melquiades Tube to k...
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[quote user="jessie.dazzle"]A possibly dumb question here: When you and Paul give figures in milliamperes, where are you measuring the current (at what points), or are you extrapolating the figure? [/quote] The 6C33C current is measured in mA. The wa...
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[quote user="Romy the Cat"]
The last two weeks I have no preamp in house. I have great vintage EVS attenuators but I can’t use them with Melquiades as they talk with Milq’s input filters absolutely killing sound. The only way I can play music thos...
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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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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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[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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that blue motorized ALPS volume pot is utterly waste. the weakest link of the chain of every audio device I've heard. it's a carbon type potentiometer and has a bad effect on the sound unless the pot is used to control a secondary relay ladder resist...
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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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[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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I do not nave, neither I see in the schematic, a resistor
but rather an Lpad shunted with two resistors, exactly how I described above....
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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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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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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.The 6E6P-DR (also 6E6P-E) a...
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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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Yes, 5mA is about right. Each 12AX7 eats around 1mA (some time a few fraction of mA more). So, if you have 3 tubes for 1.2-1.2ma each then it will, be around 3.6ma or for all intended purpose you can call it 5mA most likely you ask this question beco...
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[quote user="ArmAlex"]Dear Romy, after a lot of delays I finally found someone technical to build Melquiades. I'm afraid that I may disturb you a lot with questions.Anyhow the first question is:for some of resistors no value for wattage is mentioned ...
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I have coved this subject in past. I was not able to find a solution how to add resistors to change loading and how to make it to be switched that would not degrade sound. So, my own phonocorrector has no adjustable loading. If I need to do it I woul...
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Yes, I guess I would sing the different songs if I need to load them differently. In fact Mi might need but I juts refuse to acknowledge it. Nevertheless I am not planning to compromise my phonostage by different loading. BTW, did you try to load the...
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Paul, again the diodes are there not because they are diodes and one needs a diode action there, but because they wanted to substitute cathode bias resistor with something that would have a big static resistance (to set the DC point and stabilize) an...
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[quote user="Romy the Cat"]I mean the driver from 14Hz to 150HZ gas absolutely linear impedance as it has no active load. I look at all of it and felt so tiered and I walked out if it. I think in the new room the horn is shooting into the wide open s...
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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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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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It sounds as though C10 is OK and correctly connected. C2 is OK as well considering it is in parallel with a 30k resistor. The next thing I think, is to turn on the amplifier with both tubes in place and check the current through R21. If R21 and henc...
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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 am sure I made a reply last night, but it is nowhere, so here it is again.44V across R22 is equivalent to 0.88A which is way too high and would require a resistor rated better than 40W. R2 is dropping more voltage than it should. I would look at ...
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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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Hi Domidaw, it looks like your amplifier is working pretty much correctly. The plate current in the output tube is a little below the recommended range (180 mA versus 200-280 mA in Romy's diagram) but too low is better than too high and you can adjus...
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The "funny" thing is, the part that "sounds the best" in one situation might not do as well in another situation. A great example I can remember is the fabled Vishay S102 resistor at the grid. Great for stepped attenuators; not good at all at the gri...
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