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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="anthony"]Hi Romy,So, six channels are now operational in the first DSET. By up I mean the anode voltages on all tubes is about right and the currents are in the ballpark of where they need to be. I am yet to check the DC Offset so hope...
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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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Regarding the "complexity" of these amps :
Not being a DIY electronics guy, the Melquiades schematic makes me want to reach for a cigarette... However, naive fool that I am, having no formal training in electronics, I look at it and think to mysel...
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Hi Romy, Your amp schematic is intriguing. I have a question about the dual supply for the input tube grid bias. If my preamp uses an output coupling cap, do I need plus and minus supplies ? The interconnect will be biased at the sam...
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I am very interested in your DSET adventure, and is trying to learn more about the application of adding crossover elements into SET amps. Looking at the schematic, I noted that you add first-order passive filters before the first stage of your...
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Romy, do you have a panel meter on the DHT channel? I am currently designing the chassis for my DSET and looking at your schematic there is no panel meter for either driver or DHT. Just trying to figure out what would be useful to have in my amp.Re...
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Tomand, John is probably the last person who supports Bidat.
I think you can get Bidat from Meitner himself; I do not see he would be
keeping it as a secret. Typically, it is
not practicable to ask pro people to share schematic but Bidat is a cul...
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There is not permission required. You might repeat the original Melquiades if you wish. All that you need is the circuit and ~$1500 per monoblock. Currently I withhold the devaluing the Melquiades schematic as I need to accumulate my own live-supply ...
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I do not, it sounds interesting but as anything that come from that forum it more looks like mutual dick sucking then exposition of subject. This Syntax guy in reality says nothing. There is no schematic but just his explanation with some very questi...
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Hi Guy, HAHAHA! yeah, I can see how you can say its similar to burnishing fecal matter. i still think its overly pleasant slow sound (which is still ok through my headphone setup and denon 103) can be improved upon with major sup...
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Yes, it is an E55L. I wonder how stable it is. Interesting to me how many of these "uber-tubes" are designed for RF operation. Should make a wonderful oscillator. The other find I came across was a pair of 6CL6. Makes me...
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Are you sure you don't mean 880mV or equivalently 0.88V ? If it is 880 mV then the output tube plate current is indeed 880 mA, which is way too high, but at least then we know C10 is definitely not the problem. What is the voltage at pin 5, the outpu...
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Romy,I looked at your Melq schematic : http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf regarding the 6E5P bias. Would it be simpler to use two alkaline battery in place of R5 to provide 3V , or 3 Rechargeable for 3.6V in place of R5 ? Did you tr...
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As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs. On search here the 7788 was mentioned as being used as the ...
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It's polishing a turd though isn't it? I listened to the 834 quite a bit when it came out and thought it sounded poor, even for the price. imho, The circuit's just bad. If you do all that to it it isn't really an 834 anyway. I used to work for a valv...
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Romy,Hi, new here. Great and very interesting website. I think a lot of people have misread you, they don't expend the time to actually think about some of the things you have said. Anyhow, looking at the above schematic (is this sa...
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N-set, yes, the unwanted capacitance of the big L is potentially a noisy nuisance. Without referring back to your schematic, I wonder if to set/bleed the tank with - a cap - before R/ground, a' l' Axiom? I think this is perhaps the most elegant as...
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this is the first time I've seen the schematic of the 834p. Explains a lot. I always thought it sounded foggy and rose tinted with limited dynamic range. There seems to be alot of feedback in there. Having said that I've never found any of ...
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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 don't see how the cartridge inductance is doing anything as far as that schematic goes.There's another thing *very* wrong with it as well, but as you're not going to pursue it, we can leave it at that....
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Well, cathode poisoning becomes an issue... I did not refer back to the schematic, but could you rig a more direct ground path/shunt via relay at switch-off to dump the tubes' HV faster (fast enough) without blowing your caps (or arcing)?Paul S...
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Hi does anybody have a BiDat schematic? I need it badly, I would be grateful for your help....
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Hi RomyHow very strange you mention this... Dave and Jeffrey have been working with a somewhat similar concept.The design you have doesn't look right - it's missing a time constant; you need another cap there. Where did you find this schematic?...
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Many thanks for the suggestions, both of you, and many thanks Romy for making the schematic available to others. This really is a remarkable piece of work and I would strongly encourage others to try it. ...
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Finally listening to my Melq which I have named Koshka!Here is a photo of my two tiered wooden chassis which I tested before sending it back to the cabinet maker for sanding and oiling.Thank you Romy for your blog and making the schematic available t...
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Anthony and Romy, thanks for taking the time to respond to my question. I want to take on this project as a learning experience both in terms of simply building an amplifier from a schematic and for my edification on sound reproduction.
I’m starti...
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I looked at the schematic for Herb's 300B SET many years ago. It's been copied and slightly modified by many.... personally, I would not use it for a 300B amp... then again I probably wouldn't use it for a 2A3 or 45 either (I think my input/driver d...
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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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Reading the Yamamoto link you posted, it actually says the amp is an SET stereo amp, not PP. You may have been confused by the schematic shown in the EML link, that showed a single channel of an IT-coupled PP.
I certainly have not heard any AD-1 ...
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Thanks, Romy.Although I am most certainly not a DIY/electronics whiz, and have no aim to be, I can +/- read a schematic and I can solder OK, have a de-soldering gun, etc.Yes, there's no question that these sockets are poor quality...
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