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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="floobydust"] The main component that limits low-frequency response in any SET is the OPT. For these initial designs, I used the smallest Hashimoto SE OPTs... their H-203S for the 2A3 and their H-507S for the 45 which are rated at 7...
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Ok, I do not know what it was: was it DHT, was it 300B, was it some other specifics of this given amp or whatever… but those two aspects that I named: intentional density of colors and randomness of pace are something that I would like to exercise in...
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If it is possible to generalize which group of individuals in audio possess maximum amplitude of idiocy and at the same time archived the minimum audio result then unquestionably the leading position would be belong the audio industry marketing boys ...
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A couple months back I sent to Dima a link with a wonderful collection of audio articles from first part of the 20s century:
http://www.one-electron.com/Misc_Docs.html
In next couple days, talking with Dima he asked me: “Roma, what is REL Company a...
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The first level of listening perception is Static Level. At this level a listener perceives musical information as a collection of the individual sounds and a listening awareness tries to evaluate the “convince-ability” of those sounds. At this level...
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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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I was asked a few days ago what I think about Zandèn new CD player and I replied that I do not think about it.
Truly, those companies produce new models each 18 month to initiate new rounds of cash extraction from clueless, deaf and blind audi...
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The regular readers of my audio blog probably have read the thread: “How to record FM broadcasts” at:
http://www.goodsoundclub.com/TreeItem.aspx?postID=1644
As you know I turned into to do it digitally and I do like it quite a lot. A couple months ...
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You decided to go with mA or are they mV against 1R resistors?
I prefer the second approach personally and I feel that I can moderate the quality
of resistor and I can’t moderate the quality of the milliampere meter coil.
The whole thing looks l...
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Romy, thank-you for your help so far. Unfortunately I now have some more hopefully simple questions regarding the "pre-final" schematic from your "6 Channel
Melquiades" thread (see below). 1.
Do you have a “final version” of the
schematic any...
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I was promising to tell stories of my audio miracles with no
order of chronology or importance, so here is another one. I think it was in
2002-2003. I was transitioning from Lamm amplifications to Melquiades and was contemplating
to introduce a DH...
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I was telling somewhere that in case you have built Super
Milq then you need to label everything. My Milq has test point at plates of the
first tube, the bias and plates of second tube. It means 3 test points per channel,
time 6 channels it makes ...
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[quote
user="anthony"] Plenty
of thought has gone into the speaker cables largely because there are plenty of
them and I would prefer for them to be hidden completely from view. Five
of the six channels exit the amplifier in the well that fits a...
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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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Post #83:
Bias
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by
G
on
2018-04-03
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Hi Romy
I have built a Melq prototype and need some help with the bias.
This is my first tube amp build so my understanding is not great.
All parts values were used as per the 4.4 schematics. Rectifier bridges were built with Infineon SD...
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Gintaras, basically it is not bias voltage
problem but voltage drifting +-10mV with preamp disconnected. The 10mV is absolutely
irrelevant voltage. You see, the gas tubes are voltage stabilizers but they are
not as precise as the SS stabilizers. T...
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[quote user="nl"] 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, ...
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Found some interesting comments on an independent web site, Twogoodears.
I'll copy it, it is from 2009 with original lines from Arthur Salvatore and a comment from Stefano Bertocello - Twogoodears owner -, we will n...
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[quote user="drdna"]
Paul S wrote:
Well, I thought there was a lot of this going on all along, but that we just haven't come up with much that is "universal" Yes, my thought is that there is NOTHING universal, but that thes...
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[quote user="rowuk"]I have experimented
with SS/SET and now DSEP for ceramic magnet horn drivers. I will agree that
ceramic drivers with SETs that I have heard being suboptimal, but after a year
of DSEP, at least for my use case, I am quite conten...
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This material is courtesy to Mr. Shibazaki, the owner of Sibatech Shop in Tokyo, that sell internationally Japanise Hi-Fi equipment.
http://www.sibatech.co.jp/
I hope that Sibatech people are more decent then our american distrib...
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I do not care about the room treatment at this point. The treatment
you use looks like very effective but it is very premature in my mind to think
about it. It is not to mention that the
contribution the treatment has to LF frequency response is ...
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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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The best midrange comes from compression drivers, it has that minuteness, transparency and dynamics that no other topology can offer; the main problem with them is that they only cover a very specific mid frequency ran...
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Dear Romy, regarding your efforts to solve variations in mains power supply, there has been an interesting thread on RAT related to the use of toroids as power transformers that morphed into a discussion about the level of DC offset in mains power su...
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