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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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My Dear friend Romy,Indeed it took me a very long time to decide upon regulate or not. I ended up with regulation option to save some chassis space and weight, otherwise I would need at least 10 kilos more and 30% bigger space that would make the who...
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thee srp in Zarathustra is cathode bias, melq is grid bias. If gas biased the srpp it would no longer be the circuit in zarathustra. what would this do to sound i have no idea. The function of the gas tubes in melq are not only for providing bias. ...
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Domidaw seems to be saying he has only one channel almost working, this one with the burning resistor. I don't think he said he has one (other) channel working correctly. If he is really dropping 240 - 196 = 44V across 50 ohms, then he has 44/50 = 0....
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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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Hi.
1) He was very certain that it was not a result of a softening of the suspension or the speech coil for that matter.2) Probably it it is more significant to look at the harmonic structure and decay of the vibrational spectrum of the magn...
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[quote user="Paul S"] Pretty clean, Romy (and one hellova tranny at Fundamentals)! [/quote]
50mA, 60H, LL1623 Amorphous
[quote user="Paul S"] I thought you said Vishay metal foils in your earlier response about bias adjustment?
If so does that me...
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Hi Romy, The final ratings on later ST-style glass 45s was 10 watts on the plate and 300 volts cathode to plate max. Recommended bias current is between 34-36ma max. Short answer... I prefer no more than 34ma on the 45 cathode. It's a coated cathode...
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I see, this tri-way Quad system for sure shall be much different from regular Quas. I kind of even understand why you stay with open baffle bas to support the system’s bass. For sure it will not Bruckner-style pressurize a room as non-dipole bass wou...
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[quote user="KOTriode"]Romy,I looked at your Melq schematic : http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf regarding the 6E5P bias. Would it be simpler to use two alkaline battery in place of R5 to provide 3V , or 3 Rechargeable for 3.6V ...
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So, looking at the schematic below......I have a few more questions25 turn pot in the filament supply. For the life of me I can't source a 25 turn pot. The 10 turn Bourns 3590 is the closest I can find. Do I need to keep looking for a more sensiti...
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DA, I would not use any switched power supply, not to mention that they do not need to be regulated for LEDs, relays and fans. I do not know if you build a full range Milq or more complicated multi-channel version. If it is a full range Milq with onl...
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Hi Romy,What a busy year just gone! Finding enough time to just sit down and get the DSET's going has been impossible, but I have time now and have started the process.At the moment I am introducing some high voltage to the first amplifier chassis, ...
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Dominik, in terms of technology advancement, it seems their new driver is better than their other models. But despite this, I’m not sure their transducer engineer knows how to make the drivers to be valuable in terms of sound/tone. I’m saying that n...
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...but for a different reason.After lots of traveling I'm finally back and continue my long lasting assault on 834.Pieter kept his word and the nano core transformers (both his MkII and a experimental pairon my yet bigger cores) are here. I removed a...
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[quote user="Romy the Cat"]Brian, and how do you find your MOSFET behaves compare the 12AX7-based cathode follower?[/quote]Romy, I have yet to try. Only got them on recommendation very recently. They're cheap enough to try in a B9A plug-in without al...
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Alex, I think that there is VERY high probability that your hum is from transformer-correctors interfaces. Get rid the transformer, change the loading resistor accordingly and use the corrector with high outpour cartridge, let say over 3mV. If you w...
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Romy, Now you mention the issues here, I am thinking about what the differences in quality might be due to. I notice that you haven't explicitly said which is better, super or regular... so think of this just as brainstorming as to why things are... ...
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I already have some PY500 (it's a sign =))) ) and I have 836 too.I read about Malquiade amplifier threads.So it seem peoples on this forum like horn speakers (I love them too) and are looking for fast transient response, it's exactly what I like.But ...
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My first answer would be "3". But then I think some more...Is "A" really a shunt? Where is the power dissipated? Certainly not in the capacitor. The signal is burned off (converted to heat) in the series element! In circ...
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N-set, it is nice to see that you are keep punching the idea, somebody shall, I guess.. About the filters. For the low-pass and in this application I do not use inductors and much prefer RC filter. In LC filters the band-pass flows over coil. If we a...
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[quote user="Lbjefferies7"] Having said that, the 15 Commandments above look like a fine solution-based pre-amp...and the title reminds me of Mel Brooks as Moses. [/quote] Yes, it was exactly my point of reference. [quote user="Lbjefferies7"] A p...
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This is very interesting subject.
I expect that tghe new Midbass horns will have somewhere 108dB sensitively anechoicly. The driver is 99dB and the hyperbolic curve has much more EQ then Tractrix and that is more important the EQ that work mu...
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Romy, I'll limit my answer to only speaker-related problems. 1) Still too bright sound. Not hard or edgy, just too much top end. My local guy suggested trying a single resistor in series, rather than an L-pad, to tone down the tweet...
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Does anybody try to change shunt regulators OA2 to 15K Ohm resistor?I heard from number of people that OA2 is too noisy for phonostage.For example, in this article wrote about this http://www.audionote.co.uk/articles/tweak_ai_p2_phono_mod_0...
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[quote user="N-set"]
- considering another red tip 12AX7 for the output but given the change was not big at the input it's more of an itch...a costly one at $275
[/quote]After a second thought actually the output tube is obviously in the feedback...
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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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Antonio, I never understood this concept of “gain selector”. If I remember correctly S&B had 10, 20 25 db options via re-wiring of the primary coil. It is not complicated to place primary in some kind of rotary 3-position switch but it would be c...
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Romy,
I know you are busy building new speakers at the moment, but I have to ask for your help.
I started putting together the full range melquiades amplifier. This is my first time building any electronic device, ...
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[quote user="KOTriode"]Ok, I just read your "Melquides Remote biasing". This technic can not be duplicate in my amp due to DC coupling, the C3G (I dont use 6E5P) driver stage basically adjust the 6C33C current in the output stage. Just for curiosity,...
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