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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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A few days ago a friend of mine and I did spent over an hour to fantasize what might be done if the ULF tube SET is planned. It is not so simple as to drive the tube like 833/GU-48, you will not be able to do with Milq driver. But I also would like d...
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Romy, no not at all. I'm listening to music right now and prefer running directly from my new AC mains rather than from the PP2000 battery. But it's so soon after my dedicated mains system has been installed that maybe I should just wait a while befo...
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[quote user="Romy the Cat"] When I have my old transformer 11:1 then I had the midbass horns calibrated so perfectly that you can tune a large symphonic orchestra by it sound. It was spectacularly stop-on setting with any type of music if played it n...
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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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KOTriode, …no one questions the usefulness of having a regulator and the ability to adjust voltage and current independently. However, it is necessary ONLY during a design phase and sine you have figure out the optimum operation point for a given tub...
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Well, they did not meet your specification, that is simple as that and they shall be taking care of all international shipping cost , import tax , VAT. I am a bit surprised as if it is more or less serious company then they shall not be able to miss ...
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Hm, it is interesting. The loud popping pings in the lower MF and upper bass region are unmistakably signs of the 6C33C be gunner. Then you replaced the tube and the pings are still there. It is very highly unlikely. You might burn a cap that interm...
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Domidaw, I am not sure if I will be wrong if I say that this amp was first electrical device I build also. so I went over the same problem as you are going. trust me I made a number of ridiculous mistakes as well and so many times I call to peopl...
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The “Enjoy His Music” published the old celebrated by many DIYers Herb Reichert’s article about his 300B amp ideas.
http://www.enjoythemusic.com/diy/0709/flesh_blood.htm
I read it before but reading it now, after a few years again...
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When I use Pure Power then I hear no noise/buzz from Big transformers of Power amplifier.It seemd Pure Power 3000 blocks DC .I have no device for measuring DC voltage of AC line.I did not use any DC blocker before Pure Power and I have no idea about ...
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I’ve been having everything ready to be implemented for a few weeks now and the only thing that holds me is the inner-stage couponing transformer. It is 75% nickel and it was built but O-Netics. They are not overly fast with those off the wall orders...
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Romy,I already send money to Pieter for OTP transformers. Now I need power transformers and chokes.This is Pieter propose: (He look at the schema)2 x power supply transformer - 12,6V/5A - 6,3V/1A2 x ...
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[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 components are added...
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DA, from what you say I do not think you need actions to do now. As I understand the power transformer for the amps most likely has been made. Since you are in design phase and the look forward to have a sever voltage then get 1-2A 12V transformer w...
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Alex, From what you report it looks like it might be the filaments. The 32mV is a bit high for filament ripple, I usually prefer it to be 5mV but 32mV shell not have hum. Do not bring the filaments directly as you did but make it running by tool loo...
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"Indeed for classical work I often find a slightly under damped bass response to be emotionally evocative and of benefit to the illusion of the acoustic"Have you looked at the primary cause of this issue with most SET amps? I can tell you that ...
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[quote user="decoud"] Romy, can you be persuaded to post a sketch of what you think the optimal 2 channel Melquiades circuit would look like? [/quote]
Decoud, I do not think that there is such a thing as optimal DSET. The entire concept of DSET is a...
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Yes, I do know some people who advocated that after a transistor output stage it shall be 1:1 transformer. According to them the transformer cleans up the bad residuals of SS and enrich signal with something. I do not know how to relate to this, I ha...
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A few days ago I decided to learn how the new Melq sound and made a quick speaker level crossover for one of my Macondo’s channels, putting the new built Melquiades to drive the acoustic systems that the SET meant to drive (Before it was 82dB and 88d...
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AlloT wrote: "Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakag...
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I read about the GU-81 penthode. It's probably a good possible solution, thank you.I haven't so much experience with penthode, from my very few experiences, I felt better with triodes (DHT or IDHT), so I prefer don't take any risk.I feel more and mor...
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[quote user="gordan"] plus they IMHO sound better - less prejudiced towards a romantic SET sound we all know (and some try to avoid).[/quote] Yes, Gordan, it is exactly what I heard about the 10s from the sources that I found rational. The huge plate...
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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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[quote user="Romy the Cat"]If I succeed to make my midbass horn at attic then I will face another problem that I do not know how to address at this point. The horns will be powered from Melquiades bass channels – it means it will use a good 70 feet s...
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[quote user="drdna"] I am kind of disappointed, since you typically advocate a very careful and systematic way of proceeding. What do you mean by extremely different positive?[/quote]Well, I it what it is. I am not DIY-Moron and I do not do und...
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Alas, no time for anything at the moment, the listening valuation must await construction of the amps (and speakers...)Also, it is a very custom application - it is designed to drive an array of ribbon tweeters. Normally these have matching transform...
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[quote user="KOTriode"]It's 60Hz hum, caused by both mechanical and magnetic field coupling to the output transformer. I used a toroidal transformer and thought it would not caused this problem but it did. When using an external power supply for ...
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The reason that I built the 6C33C preamp was to explore the 6C33C true musical potential like I did with the 845. Not only did I compare the sound of these tubes in power amp, but also in preamp. The reason is that with power amp you might hit some l...
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[quote user="Brian Clark"]Have you experimented with transformer attenuators Romy?[/quote]Nope, I did not. I have two purely theoretical problems with transformer-attenuators.
First I did not see any transformers that can handle LF all the way down ...
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Yes, you are right it is rather my negative prejudges and I should not proud about it. It perfectly possible that Bend is a fine performer…. Still, it is a transformer and no mater what you do is a band-pass filter. It is still inductance at the bott...
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