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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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i have vitavox S2 and also altec 288c.i am trying to source the fane studio 8m,just missed a pair by 1 day on uk diy.until i get the fane and make a horn for it,i will use altec 515c in vot.i also have jbl 2405.yes i will definitely build the full ra...
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Romy,I hate it when I realise I need a different transformer...The following is not an ideal solution because it breaks one of the Melquiades design features, but may be worth trying - cathode bias on the output stage? You could burn up some vol...
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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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Meriln, this is one of the subjects that disturbs me in your description: your bring OTL consciousness to justify Berning and you bring all those foolish OTL people as witnesses to give credentials to Berning. We all know Doctor Gizmo and all know hi...
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Well,Berning is a genius to be sure. Here he fixed his sights on the "evil" output transformer. Every part of the circuit alters the sound somehow, of course, and the goal is to find the least damaging topology. The question is aske...
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[quote user="Dominik"]Hi,From Pieter:"For me it is normal practice to do good specifications. I go for 10 Hy's at 250mA. 10 Hy's with 512 ohms source impedance will give 8 Hz cut off frequency."[/quote] Dominik, when you get your transformer from Pie...
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Well, my dedicated mains supply is now active. It took over 2 months to install because my electrician seems to have an aversion to working more than 1/2 an hour a day. But he loves hanging out at electrical supply stores... judging by the amount of ...
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[quote user="Romy the Cat"]did anybody pay attention that all coupling transformers-loaded amplifiers (among those that I heard) sound in a similar way as the amps with high voltage output tube that run over 1KV on plate. Did you ever think why?[/quo...
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MFA e-mailed me aknowledging that I was perhaps going to try the DIY way getting a "raw" transformer from S&B and offered me assistance. The "problem" is that their unit with a gain selector and load selector is way too expensive for my budget (1...
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[quote user="Axel"]OK, this is useful also, in that you have not noted a "pattern" as you say. My point is closer to your suggestion, that I do change cart --- and sometimes buy new ones, B U T I do not buy other SUT (at least I try to avoid it). I'...
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A small word of advice regarding wiring the 6c33c heaters.My DSET's have now have several thousand hours of use and I love them to death. I've not heard any amplifier able to do what they do. The first amp has over 10,000 hours now and has never fa...
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W,
Be careful with Milq’s LF channel. When you go for a dedicated LF SET and make the SET to operate very low then you need very precisely dial in the loading of your out tube with the behavior of your LF drivers/enclosure. Without know the very spe...
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Both UB Horn roll off circa 130Hz in room. There are a couple of rough MDF boxes here that I knocked up from spare sheet a while back. Have not tested them specifically at the intended spot behind me but running around with a microphone shows those...
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I am taking about coupling capacitor between driver tube and the DHT. There are zillion way to do it and no one said that they need to be used. No one proved yet that a very good quality of caps shell be worse than other methods. In my case since the...
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Ending up re-amping my MF channel, I found myself at unexpected situation that I am not completely compostable with Macondo HF. It is not that the HF are bad but they were made to serve the interest of older, slightly softer operating single-stag...
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Well two power supply's ready and one full range amp hooked up.Nothing blew up so that's good!1) output stage 200mA /187V2) driver stage 205v (test point A) and -4.3v bais3)setting 0.000v on input is ok but not stable,some DC drift4) bais lines are l...
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[quote user="Romy the Cat"]I can’t see the pictures. What I was thinking to connect the ribbon’s array in series and drive them with one custom better Bad’s transformer. Or perhaps if it were I would say .3R ribbons then 5-6 drivers would make a coup...
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I would defiantly avoid any taps by any cost, regresses how “advanced” they are implemented. On the page that you referred the first configuration, with secondary sections sticking outside, looks like a reasonable to me.
Yes, the 2.4k to 3.0K load w...
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Ok, I have figured out why I have so extended bandwidth over 73kHz for my tweeter. I forgot that when I measured it I had the LPAD wide opened and in this configuration the parallel resistor is 20K and series is shorted. So, in that case I had just o...
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Very good, floobydust. They are exactly my thoughts about the “period tubes” as well. In addition to that I think that factor that call “Holly Ignorance” did take place with some vintage tubes. They might not have too high demands for the quality of ...
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[quote user="Romy the Cat"]N-set, can you explain what you are saying? What kind ringing are you implying? Are you taking about mechanical ringing of the wire or about the after pulse ringing? [/quote]I referr to the after pulse ringing. The parasiti...
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[quote user="N-set"] Hm...If taken outside the context, I'd swear we are talking about some critical cap in a feedback loop.[/quote]The reality is that the subject of a cap on primary of transformer is very much in context of my phonocorrector. One o...
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This is probably a related question to LED bulbs with their electronic transformer crap inside.I have not noticed any noise with the full volume up on my Stax O2 so far andI was intentionally looking for it. There is only a gentle crack when I switch...
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Ideally, you'd want to drive 35 feet of balanced interconnect with the low impedance source ( say below 150 ohms or so). How low depends upon interconnect capacitance. You can try Jensen output transformer to convert SE to Balanced at the phono-stage...
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Here are my notes on adapters. I am not an engineer so I do not have further explanations readily available but could probably dig them out.1) It is physically impossible to make an RCA male or female with an impedance of 75 Ohms, so all digital RCA ...
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Since I got my stable and good quality electricity back I recalibrated my bass horn. Again, I set it up with very precisely and absolutely without any measurements, juts by ear, to sound exactly how I want it to sound. This is in a way my crown jewel...
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Yes, Peter, thanks, good reading.
I research the DC offset and toroids subject as well. I think it is not as bad as it is portrayed. First of all it is not complicated to make toroids with gap, sure slightly more expensive. Also if do not save mone...
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[quote user="drdna"]Berning is a genius to be sure. Here he fixed his sights on the "evil" output transformer. Every part of the circuit alters the sound somehow, of course, and the goal is to find the least damaging topology. The q...
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I did read your earlier post regarding the P300's use and unsuitability for analog in your system.I am starting to listen only in the early morning, and I can hear The Change as the day gets going and I presume people start switching on their ai...
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This is Romy's unit that he let me borrow.It does produce the cleanest electricvity I've heard in my system in over 30 years of trying.A new find last night: The one amp with the problem power supply transformer is buzzing at the same frequency as th...
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