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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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HelloDo you mean 78% nickel? As it's Dave's iron, I'll even *pay* to take it off your hands :-)Re 10Y: Well, it's one of the most linear tubes ever; and this has been backed up in some brief listening experiences to some of its variants. A friend act...
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Hello Romy!Cessaro had severe resonance problems in their room, so I didn´t stay long here. What I noticed in the short time (maybe too short for a qualified judgement) was no stabiltiy broblems but less musical than the 300B last year. Hard to descr...
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The weak bass of low-power SET amps is well known. I don't think anyone would disagree.Some reasons:Simple low power, especially with 93db speakers (try with 106db like Yorkville LS1208 horn subwoofer it might be different).SE output transformers hav...
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Hi!Sorry for not spotting this thread before. I'm the member of this forum and I read it from time to time. I don't know what do you mean with "he is from diyaudio.com site"? I'm member of a few formums and newsgroups but I wouldn't say that I'm from...
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Paul,
Ok, I would agree with this. The power handling is the factor that I forgot to mention. The Japanese home drivers are rated for a few watts vs. the pro driver are rated for hundreds watts. BTW, some of older pro drivers (like my Vitavox) wer...
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A typical switching supply does not evenly load the input (sinewave) power source and can create some dirt on the AC line (Paul's "backwash" statement??). Depending on many variables, the amount of contamination the switching supply could contribute...
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Romy, I have some (strong) opinions on DHTs concerning filament supplies versus specific tube types. For virtually ANY 45 triode, AC is my preferred option. Still, not all 45 triodes will be acceptable for my use, hence weeding thru many of them to ...
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My experience has been that tubes that run quiet and quiet down quickly and "properly" when tapped are almost always quiet with respect to self-noise and/or microphonics in use, apart from low level phono use. And most of my tubes tha...
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This thread has been pretty interesting overall. I've read most of it and would at least like to provide some feedback on the technical side of designing with the 45 and 2A3 DHTs... at least from my personal experience. A few years back I decid...
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Thanks for your comments, Roman.You're someway right... Goto foolishness;-))) maybe... also Mingsu wrote he "never" saw such a (Keith's - or mine) way to use S-150 mid-low horn... everyone's - me too, also with some doubt - copycatting each othe...
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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" in the usual, "what do you recommend?" sense yet? Maybe this is because one person's Cu PIO is another person's...
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[quote user="Romy the Cat"]Anyhow, the Melquiades does have some “tricks” in the realm of dynamic viscosity. It is what make it quite different in term of Reality Reconstruction as I feel that propagation of sound via air does not have linear “audio ...
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If I am working on AC quality because the AC quality in the big building is very very bad.My apartment is in a big complex shared between 200 apartments + 7 big elevator and ...This Building has three phase AC power , in most homes the AC is better b...
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Hi, I buillt the amp based on your circuit with the exception of the bias scheme. Currently I have CRCRC bias for the ouput valve and Lithium battery grid bias for the driver. I use the amps to drive low efficiency 2 way ported boxes and vintage Tann...
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Iraschwips, I do not think that it has anything
to do with impedance at all. You might have sub 1R impedance of your
loudspeakers and perfectly compensate it by wiring a custom transformer that
will perfectly work against lower impedances. I would...
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Merry Christmas!Nice woodworking job on your speakers.I have a couple if questions:Why did you select the drivers that you did?What made you select one horn for the midrange but for nothing else?What process did you use to select the crossover points...
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G'Day Rowuk,Thanks so much for the quick replyThe drivers were recommended by the person who made the cabinets. All three are supposed to be quite well regarded.Initially, the project was just going to be 2 x 10" and the Beyma tweeter, which in itsel...
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Vincent Brient is French guy who has built an interesting installation that I think worth to analyze. Years back Vincent was an enthusiast, like normal people, but it looks recently he turned “pro” and came to audio market with his own version of...
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Thanks, Roman... I strangely (?!?) feel me like a schoolboy at his first primary schoolday... virtually ALL my (limited) audio knowledge, vanished... and I'm dealing with brand-new problems, like a crossover with fixed slopes and cut-off frequencies ...
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[quote user="N-set"] I do have some serious concerns with respect to my design, the LF stability beeing the most important one (before we even approach talking about the Sound...if any); you may rememebr I was asking you about the stability and relia...
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Hello Gera,First thing I would do is get rid of the active Xover, in my experience they mud everything up. preamps are very important and this is like a double preamp with a lot of gain stages. For bass you can maybe use it. I use a separate Xover...
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Novygera:If you have a transformer where the impedance primary-to-secondary is 5K:8, it means the turns ratio is (5000/8)½ = 625½ = 25. This is the ratio by which the voltage is stepped down and the current stepped up in going from the tube to the s...
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Silbatone made a Demo with those Horns (the big ones)They said, it is one of three existing WE Horns, made 1935/36 (only mod is the addition of the tweeter you can see there). One Horn is made for 3500 Visitors, so we got a 7000 People Demo with them...
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Thanks, Romy, for your generous reply.
I won't try to address everything about everything, but let me bore
you with a mini-history of what is going on with my playback so you
will understand where I'm coming from and where I'm trying to ...
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[quote user="Paul S"]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" [/quote]Yes, my thought is that there is NOTHING universal, but that these choices must be observed in CON...
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[quote user="drdna"][quote user="Romy the Cat"]David got rid of transformer and replaced it with a DC transformer, claiming that it is “better”.[/quote] And I should point out that not only is there still a transformer in the circuit, but many other ...
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What I find interesting though, Romy, is that many of the SET measurements show gross distortion even when putting out very low power, which suggests that they are saturated from the high static DC current running through them as they must for a Clas...
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[quote user="Merlin"]No. You are wrong. Harmonically, my SET is quite superb using either 300b or 811 I have unfettered access to the music in it's entirety. Transformer cores just distort the signal. [/quote]
Well, I do not want to argue the ...
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Hi Romy,
I currently use a 3 stage transformer coupled amp with 112's, 71a's (as drivers) and your favourite 300B output valves:-) I'm not sure whether I'd go back to a capacitor coupled amp. I just acquired some Tango NC20 IT's to replace the NC...
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[quote user="Romy the Cat"]
May ask you: how you drive your Reds 10” and the most important do you feel any their deficiency in power handling. I mean after the 109dB Macondo I have tendency to drive the small Reds slightly hard and this LF drive do...
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