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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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The ECL82 = 6BM8 was used a lot in low-end amps, both push-pull and single-ended. Actually, according to your radio's schematic to which you posted a link, they are not being used "one per channel," rather it is a mono radio (nothing wrong with that...
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[quote user="Welborne"] 1) There are hexagons on the schematics marked with A, B, C ...M. What are these? Are they testing points or they carry some meaning? I can't find much info about these here. [/quote] Yes, the hexagons are test points. Do ...
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Hi Cat[quote user="Romy the Cat"] However, here is where the trick begins. Putting the headphones on, playing them along with the big loudspeakers system and adjusting the volume of the “big system” (primary the LF channel) it is possible to take the...
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Got today the parts and finalized the “perfect” Bessel passive crossover for my new channel. The coils are regular air-core 2.5H and 7H, the caps are Theta 10uF and the small wirewound tuning resistors that kills ~1.5dB in the channel. When I pu...
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Unless they are quite unusual I doubt your amplifier's output stage uses regulated supplies.My point was that PUREPOWER/Inverters, etc. deliver a far more constant AC voltage than the line and that this could be a reason people find them to be usefu...
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[quote user="Paul S"]I am a little suspicious of the Allen Bradley Club mentality, including vintage (carbon comp) resistors, transformers, caps, etc. When I have bothered to listen, I have often chosen "selected", "non-inductive" wir...
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A long time ago, when EAD dsp 9000 pro came out, Wadia had a DAC with volume control I dont remeber the number right now but -i think it was the 2000 anyway, the big deal about the EAD 9000 was that the integrated volume control was only 6db in the ...
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.... last week I opened my ups/regenerator and found some things that deslike me , I know that not always better componenets make a device sound better ,but I do not want anything that goes against my princples , this is very personal . Tha capacito...
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Post #90:
OK
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by
N-set
on
2011-08-25
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[quote user="Paul S"]N-Set, at some point I wil try to actually pay attention. In the meantime, does effective RC change with signal/gain in this situation? If so, it might also appear to "change the slope".[/quote]Paul, the FR does not seem to dep...
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[quote user="Romy the Cat"] 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 linest...
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I think the key to understanding this case is that it is beginning to look like the tubes that came with the amp all were over the hill, electrically. Since I have no way to test them other than by ear, that is what I have done. So f...
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[quote user="anthony"]
One question that I still have regarding the
L-Pad on the MF Channel is why you did not lose more gain at the filter before
the MF driver stage? By my reckoning a resistor change here would shunt
more signal and you would ...
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[quote user="cb"] The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adjust voltage to 0.0mvdc, I get a reading of plus 0.4vdc. This is with VR1 set at maximum (...
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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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OK, it took for a while but at this point I have nailed down all design aspects of the new 6-channels Super Milq, and particularly its input stage. I have listen and evaluated all solutions that will be implemented in there; selected, appraised and o...
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Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...
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No, I did not try to use grid chokes. The setting for Milq was flowing: the highest voltage in the gas tube and the highest value of resistor to the grid. Frankly there is a LOT of mystery how it all works out together and how it all inflicts s...
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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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[quote user="Romy the Cat"]3) There is a mistake in Milq circuit. The B+ of the driver stage has almost insufficient amount of critical inductance. It was because I drew the circuit having the Super Milq in my head where the PS was feeding 3 stages a...
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Why use the GM70 apart from its power potential? For one thing, it seems to require literally lethal voltages to become remotely listenable. Is it really "that" linear, to insist on it?But my experience with GM70 is quite imited. I ...
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Hi,[quote user="Romy the Cat"]So, I have no idea who was a target market for those TX-103 optimization kits [/quote]There is no "TX-103 optimisation kit". There is a commercial stepup product. It was designed to be sold through current, existing dela...
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1) Be very careful with use Halco resistors. They were very good 15 years back but they turned south very aggressively. I bought a party of Halco in 2005 and I forced myself to trashed them as they were very noisy. You do not use then in critica...
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[quote user="Paul S"]Based on previous trials, I have avoided putting resistors on my new ribbons so far. Finding decent caps and coils has been enough of a problem already, since everything comes through so clearly. Maybe a variable indu...
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Romy, that's sort of a feedback I was hoping for, thanks. Ok, I see the point, with the feedback and R3 resistors. The last loads the loop. I have now there 1W Dale RN65D, guess Z-foils with their 0.25W dissipation won't work.
A...
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[quote user="N-set"]
Only yesterday I started to get some interesting results after tuning the UK crossovers. But still not near to the sound I'm getting from my electrostatic headphone setup. I assume my Dannoy setup is quite compromised: one of ...
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Romy,Hi, new here. Great and very interesting website. I think a lot of people have misread you, they don't expend the time to actually think about some of the things you have said. Anyhow, looking at the above schematic (is this sa...
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I did not shoot for the Collectors' Holy Grail to start, but I looked for and bought a +/- "generic" version. The 3.5" I bought are unusual only with respect to their atypical (smaller than the usual 4") cone. They are 88.9 mm, as I recall. Otherwi...
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As to the best transformers souding more transparent than the best resistors, I'll believe it when I (don't?) hear it. You claim to have heard this but I most certainly haven't. Based on theoretical arguments the noninductive metal film r...
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Romy, I have to admit that there are as many differences in film caps as there are in electrolytic caps. You can find varying opinions for and against both based on brand, type and usage. As noted, large value film caps get (physically) large so you...
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I once saw a phono stage that used sand diodes, and I have seen an interesting "tank circuit" amp that uses tube diodes +/- like a "buffer". Of recent "popular" amp designs, I have seen a lot of triode PP, but I think this is the first SE pentode I h...
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