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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hi Romy,thank you for your answer. On weekend i will rebuild my amp for the 6E6P-DR. You are right, the tube datas shows that pin 8 is a screen. On D3A pin 8 is Grid 3 connected to screen.I will try it with pin 8 lifted and connected to ground. I hav...
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Hi Romy, The final ratings on later ST-style glass 45s was 10 watts on the plate and 300 volts cathode to plate max. Recommended bias current is between 34-36ma max. Short answer... I prefer no more than 34ma on the 45 cathode. It's a coated cathode...
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Possible, I never was a big fun of 6E5P without Milq type of bias. I remember what when I did the simple fixed bias when a few year back I was trying to make Milq to sound “contestable” with ML2 it was racy and jumpy sound but nothing special. I feel...
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Yes, the last 3 pics are of the "dead" 2A3. Saying it warms up could mean two things... it literally gets warm and nothing else as it may have leaked air. Or it could mean the filament lights up (and assumes getter flashing still intact which i...
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[quote user="Romy the Cat"]Why do you think I bout a 1000 of them and closed to the rest of my life my interest in driver tubes?Still, the 6E5P should not be measured as a driver but heard as a driver – the beauty in this tube is in its sound.I do no...
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[quote user="Romy the Cat"]
[/quote] I received a link with description how the YO186 tube that drives my MF was used by Russians. In 30s and 40s it was used in portable film projectors PU-12 and PU-13. Below is the schematic of the PU-13 low frequ...
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Hi Romy,I am designing the power supply chassis for the DSET at the moment and hope that you can remember some things about how you managed the grounding.All power supply components up to but not including the filter caps for each power supply will b...
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Paul, 100% agreed on the real world test vs all other mental exercises!!!Not sure on what do you mean by the "follower"?Yes, I need only 2 stages, perhaps TVC at the input. I'll even have a bit too much gain, if I'm correct.Romy style bias on 6E5P an...
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Ok, the Headphone “Baby Melquiades” protect is over. Well, kind of over as there are some issues still are hanging in there.
A brief summary. The initial idea was to use the Melquiades’ input stage to drive headphones. Unfortunately it did not...
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I've made an itellectuall excercise and tried to see hoe to fullfil (some of) Romy'spoints regarding the bass amp.1) To get 100+ W from 833, HT between 2.5kV and 3kV will not work.Spending some time over the curves, 1400V, 0V, 280mA loaded with6.5k s...
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Hi Dima,Thanks for your comments; please forgive the chaos of what follows as I have to rush!
Agreed on all counts - the dc bias point would need adjustment and monitoring; I supposse it depends on how stable the electricity is from the wall; anothe...
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I think there is a definate trend here regarding distortions that cannot be ignored. Guy, you pointed out some excessive 2nd order harmonics with the Melq bias point. Hey, maybe so. I haven't really looked into this tube - but I jus...
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[quote user="hagtech"] I run the driver tube at 170V @20mA. I don't think you need to run this tube at high current. It is very linear with wide signal swings at this bias. [/quote]
Good operation points for use it as a driver. You might...
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This thread has triggered some old stupid sentiments. Feel free to remove this post if irrelevant. I've been thinking how to rationalize my old design in the present context and make it less idiotic.First, know the enemy. I don't know the enemy. I as...
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Yes, I do think that the caps in here are the key but there is a twist in it. The “formatting “or burning- in of capacious is a polarization of dialectic, with time the dialectic got charged and “sounds” better. Also the dialectic is mechanically str...
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[quote user="Romy the Cat"]Did anyone ever see the ready to do tube sockets adapaters that would let to pit the large gas tubes ingot the small sockets? Melquiades use 7-pin small 0A2 tubes but I would like to try the 0D3. They are the same 150V tube...
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Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have...
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[quote user="Romy the Cat"][/quote]This is a technical post.I've made some progress on my assault on the above version of EAR 834. After hard (mostly because of my idiocy) labouring through the soldering, I've creeped to the level where I can make so...
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Over the course of the enter 2006 Dima and I were involved into the Zarathustra II saga. It took countless phone calls, countless emails, a lot of thinking, numbers of shipments and many hours for Dima and me to propagate the project to it semi-compl...
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Dima and I spent today quite a time experimenting with different operation of the Single-stage Milq. We drove it from my Fluke 409D with resistor bias, loaded with 12.8:1 into 12R. Playing with bias, voltage and current we tried to find an operation ...
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[quote user="op.9"]I now run my 'tweeter' amp 1st order high pass at 2200hz (driving BMS 4540nd in 1500hz leCleach horn) so my impressions might have some bearing on Romy's new amps. I was playing around with operating points and components in my sin...
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[quote user="decoud"]Thanks, Romy. What about drift in the driver bias, etc?I suppose the liveliest component, in terms of dramatic breakdown, is the electrolytics. I have been thinking of changing to film, but in that size they are hard to find at r...
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The thing is, other people have been here before, and between them they have already gotten results that would take most of us at least a few steps closer to verisimilitude. Sorry to be such a whore, but it just seems reasonable to make use of readil...
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Paul, 6E5P may strech very much, but maybe just enough to close the gap. In such a racing car there is a little margin, it's not a usual 10W+ design. Biased at -3.5V 6E5P will produce +40Vmax on the grid, driver driven to the limitThe grid will eat ...
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Hello Romy,I've only heard the 801 in class A2, but I can easily imagine that the 10Y or 801 with nickel output would offer the purest possible sound in the 1k-10k range, such that it is the S2's true voice you are hearing. It's something I'm going t...
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[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
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I do not blame John Atkinson specifically. He is not better or worse than any other his idiot-colleges. Take a look the level of the moronity this time John Atkinson allows himself to fell. In his “review” of Lamm M2.1:
http://www.stereo...
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[quote user="hagtech"]As usual, they leave out the VacuTrace, by far the best modern day tube tester. [/quote]Interesting, Jim.
I was not in the market for tube tester but I looking at your tracer I fugue out that I might sell a few my chea...
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Yes, you are correct. The UHF are pro Canadian people and they do have the Canadian bias. Interestingly that the Canadian audio generally has very Canadian bias as well. It is very unfortunate as I always thought that bias should be for better Sound ...
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[quote user="floobydust"] On a second note, you can also modify this for both adjustable AC and DC balance on seperate potentiometers. Both potentiometers would be in parallel with the filament (and padded) but you use the wipers independantly, ...
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