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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I received a comment form people who reportedly well-familiar with using the high-frequency high gain tubes. They suggested me that the resistor between screen and grid (R23) might be eliminated and that would bring some benefits. It very much might ...
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[quote user="cb"] Also i stick a 30k resistor in R3 and the results are very good. [/quote]R3 is Milq’s loading resistor and it hardly to do anything with amp itself. Milq has own input loading is floating on the bias chains and it has a ...
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Finalizing parts ordering for full range Melquiades and I have one thing with is unclear to me, the plate to grid resistor on the 6E5PIs R23 50R is this correct ?There is another R23 in the driver power supply .http://www.goodsoundclub.com/PDF/Me...
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Hi Romy,Minor question with hopefully a simple answer.In the DSET schematic you have a 12.1k resistor in the bias for channels B, C, D and F. I have some nice 12k resistors here (not 12.1k) that I could use in those positions...can you see a problem...
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Amir,R2R Discrete, means it uses the good "old" resistor ladder instead of a DAC chip. There is more info here. But you can find more around the internet.Cheers....
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OK, I read the blurb. Now that the cat's out of the bag, and we know it's just a resistor ladder, why not use... a resistor ladder? Gotta hand it to those "MIT" guys, also I think there's room yet for upgrades. How about a deluxe, super-limited, l...
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[quote user="op.9"]Could you help me understand your biasing scheme with this version? I thought I understood the original Milq circuit - but the only channel that looks like that to me is the D channel. I don't get A and B at all! what is the 50 ohm...
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I see, let me to explain how the this work all together the you will be able to make your own judgement. Let look at the functional purpose of the emails in there. The R1 resistor is a loading resistor. This is understandable. It makes sense to kee...
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[quote user="Romy the Cat"] A few things that juts comes to might mind regarding the Cosecant. Gordon says that it is a Passive Multibit DAC with a single Shinko Tantulum resistor “because only a resistor can be a linear device over the entire audio ...
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Romy, thanks for the info on the chokes in the fullrange Milq.Today I have ordered more Milq parts this time for the power sequencing and bleed down. I decided to go for the relay sequenced bleeders for all four power supplies and figured I would be...
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I received a comment form people who reportedly well-familiar with using the high-frequency high gain tubes. They suggested me that the resistor between screen and grid (R23) might be eliminated and that would bring some benefits. It very much might ...
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[quote user="N-set"]just a minor tech remark (feel free to ignore): the big-ass elco is theoretically still well in the picture. 10uF will have 320Ohm@500Hz, which is a fraction of 20Ohm R+3mF elco.[/quote]Jk, actually it is not exactly accurate.
As...
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AlloOn the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.Given that 12k seems ...
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[quote user="valves"]Hello to everyone, am new to the sight. Been reading for a while and decided to mod my 834. I've had the unit since '96, purchased new from the local dealer. I have noticed a few differences from the schematic, the 220K load r...
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Every resistor, capacitor, tube, etc. are just physical devices that are optimized to come a bit closer to an ideal device -- a wirewound resistor may represent an ideal resistor, but it has inductance, capacitance, and other electrical and physical ...
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Thanks Romy,It is now fixed. I have left Channel B the same apart from adding a 390k positive bias resistor on the positive signal line (between C1 and R5) connected to the 14k resistor that also connects to Channel C and F. A 402k would have been ...
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OK, I read the blurb. Now that the cat's out of the bag, and we know it's just a resistor ladder, why not use... a resistor ladder? Gotta hand it to those "MIT" guys, also I think there's room yet for upgrades. How about a deluxe, super-limited, l...
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Yes, Daniel, this resistor is somewhere between 30R and 100R, the value is not truly important. The purpose of the resistor is to slightly decouple the potentials of plate to grid, it cares no current and you might use 1/8W resistor or even less. BTW...
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[quote user="cb"] Also i stick a 30k resistor in R3 and the results are very good. [/quote]R3 is Milq’s loading resistor and it hardly to do anything with amp itself. Milq has own input loading is floating on the bias chains and it has a ...
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...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), so i think i'll sug...
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Anthony, I would recommend
you go other direction. I very much assure that with over 7V on fist stage bias
the channel is dead, it should be around 4V. Let see how to fix it. I would certainly do not change neither 12.1kR
resistor nor 402k resist...
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[quote
user="anthony"]First was the issue with the 6e6p for the HF
Channel not being able to draw enough current. I checked the bias and it
was fine and the potentiometer allowed plenty of adjustment so I changed
nothing in the circuit. A new ...
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[quote user="anthony"]Thanks for your
thoughts Romy. Last night I roughly wired in some random crossovers….[/quote]I
wrote a loooong replay to you after that post but my 2.5 yo son turned off my computer
while I was posting it. Hate to rewrit...
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[quote user="Romy the Cat"]
anthony wrote: Is the resistor
in the Fundamentals Channel between the OPT and the S2? Apart from this
resistor you run the S2 without any components between it and the OPT. .
Actually it is not a resistor connected...
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Adrian, Romy, et al, Okay, I don't take any of it as an attack... so none of that bothers me.... I'm fine with it... again, it's a view on what you heard based on your test scenario, nothing more and I certainly welcome the review. Now tha...
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[quote user="floobydust"]Running the higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load results in higher distortion than the text-book operating point, which is B+ of 300 volts and a 750 ohm cathode biasing resistor and ...
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Agreed.... ditch the choke... you don't need any additional decoupling. One last model shows the following assuming a 350 volt supply and a 6K load.Useing a 1.21K cathode resistor, it works best to minimize distortion and balances the transfer charac...
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Romy, Big thanks for your answers. But i've got another question :)You mentioned gas regulator as grid current "absorber".Very good point, because personally i hate to use resistor as a grid leak.Instead of it i'll use choke - almost with any tube, i...
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Hi all ! I thought about this resistor bias idea that Chris proposed , and found some some problems here . One of them discovered Chris himself - it is a big serial resistor in the grid chain , and it can cause not only HF rolloff ( it isn't a big pr...
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Wait a minute ... will a choke input work with a gas tube as a load? The choke-rectified input is designed to work into a resistive type load, but basically acting itself as a voltage source, capable of psuedo regulation over a wide range of lo...
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