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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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First, Adrian, Thanks for your feedback on the newer designed 2A3 tubes... very interesting. I've looked at all 3 of these brands before but have not as of yet purchased any (I have a large collection of 45 and 2A3 of various NOS US brands...
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In the past month I have been playing around with a sub-woofer. This is my first experience with a sub. Prior to this, I held a bias that subs generally cause more problems than they solve. I am using a sub now because the main horn...
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Mats,
Actually I do not exactly understand what you are trying to accomplish. The Altec midrange after 4uF will roll at 3.5kHz-5.0kHz, depending of the type of coil you use. If you cut the MF channel so high then I would ask why you do so and why yo...
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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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Anthony, there is many areas for power supply
scaling down if you want to. You can put an extra 440V coil on your power transformer
that driver output stage and have PS for driver stage and perhaps bias. Do not
forget that this high voltage do not...
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I never had any fuses in my amp and never had any need for it. I have a fuse at my DHT channel as the tube is rare but not on the 6C33C. I do not really understand the problem you have with current. You have the meter that shows you current in real t...
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I used those VPI magic brick sitting on top of the transformer, my audio analyzer tell me that these bricks helped the noise by about 1db, may be the 6 lbs or so weight does damp the xformer vibration, so I leave them on, just trying everything to ke...
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[quote user="Romy the Cat"]I would certainly avoid a taper that all time runs across the wires of the transformer and constancy adjusts voltage. I do not insist that it is the best way to do the things but my experience with variac was not so encoura...
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Referring to my very recent acceptance of the 6E6P as a tetrode to drive the tweeter:
http://www.GoodSoundClub.com/TreeItem.aspx?PostID=5329
I decided to today to stick my beloved 7721/D3A in place of the 6E6P – thanks God they have the same pins l...
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[quote user="Jack 14"]For what purpose are you using them at 22mA ?[/quote]Bias supplies-decouplers, screen regulators… those types of the things…. BTW, until I load the my 0C2 with over 15mA they do not sound well…
Interesting, Jack, sin...
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Hi Romy,The builder regards VR1 more like an "offset to 0" adjuster than a bias control for the 6E5P since its working range is quite narrow. He asked me to know from you if along the 6E5P's lifespan it needs further adjustments at VR1 or if a single...
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So, my two problems have been fixed, I think.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 t...
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Amir,in my world there is a process for selection and it is not AB or changing power cords. That does not mean that I deny that equipment (including cables) can change sound. It means that the normal audiophool description "it was immediately better"...
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I am always a bit hesitant to buy into "listening descriptions". I am a musician and am confronted every day with Sound bias - attraction to what we are accustomed to, expectations being confirmed. We are creatures of habit and modifying old habits i...
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It's hard to predict how the anomaly will sound. Sort of like a dynamic bias shift in the tube. That's why I think IMD. The shift moves around at LF rates, so the HF reproduction can fall on any number of load lines (within loop are...
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London ffrr, CSA2216,; stereo LPI have always found the first movement of this symphony to be the most musically satisfying part of it, and nothing in the cited performance has changed this old bias. I have to give Solti credit here, however, fo...
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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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Rakesh,I think you’ve missed the accent of my battery post. We do not argue abstract topologies but we argue the validity of topology in respect to sonic results. I hope we all agree that we do not exactly know WHY affects electricity sound. We do ...
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Yes, I know about the 18dB click, the question is what it is. Do they turn an extra gain stage from 18dB to 24dB? Highly unlikely! Those SS circuits have a lot of gain and a lot of feedback to manage the 6dB is very much not a problem for them. I was...
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Righto then, I guess there is no reason not to try this, except that one of the original crossovers here is non-functioning (if I remember correctly), so if trialling in stereo I'll have to crossover in Melquiades. Should have the parts here to do t...
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It is not a the thread about Allnic but LCR RIAA correctors, still there was something expressed in here about the Allnic LCR phonocorrector… and I feel bad about it. It is not that I don’t think that Allnic LCR phonocorrector deserve positive m...
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[quote user="drdna"] However, the concept of the point source is absolutely valid. The audio reproduction should follow the transduction from the microphone, which is point source. We have to "play by the rules we make." [/quote] Well, let look into ...
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Three problems with the Scan-Speak are the low X-max, the built-in response curve, and limited power handling. It will be interesting to see how you juggle these issues if you do use these guys for LF. Obviously, if you bias against the natural ris...
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One was the Llano Design Group's Trinity, which had 300wpc. The first stage was tube and was in a separated enclosure providing voltage amplification, while the second stage used transistors for current amplification. I guess it was pure cl...
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Dear Romy,I do not know who uses the PowerStation75 so I cannot say whether it is helpful. I use the Powerware 5115 UPS boxes for managing the mains power supply [details on www.nps.com.au under Products and Line Interactive UPS (Corporate...
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Some time ago Romy threw me a fish in the form of two numbers, 280 and 185, meaning mV and V, respectivly, and I finally got around to chowing down. I was getting annoyed with the sound this morning to the extent that I busted ou...
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[quote user="Romy the Cat"]BTW, I have a local Bostonian guy have replied brought today a very interesting DHT amp. He has a number of DHTs and this one he reports is the special one, quite expensive as well. Although the electricity was not good tod...
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[quote user="Romy the Cat"]I do not know what you mean by “specific set-up” and what San Audio did is very orthodox use of 2A3 and I did not change it. The only change that I made (and I do not know at this point if it was a good change) was the chan...
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N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with specific DC tank circuits and driver and output tube stab...
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[quote user="Romy the Cat"]I was thinking about this: how come that driving 6C33C (in fact driving anything one can imagine) the 6E5P was very fine but driving 2A3 it was dull like hell. I opened the amp and tested all – everything was perfect but th...
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