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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="Ostblock"]Is there any technical reason that you use a 400V transformer to feed the driver tube?The plate voltage on 6E5P is only +200V. Therefore from my point of view, a 220-240V transformer would be enough.[/quote]Ostblock, you need t...
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Had some fun experimenting with 6e5p driver stage.playing with difrent output transformrs and resistors found that the stage can drive a speaker with ground connected to air. mabye this is widley know i did not know. + of speaker connected to bad ou...
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Hello Roman,Hola from Hong Kong! How are you? Haven't been here for long time. I have a question at the back of my mine for long time, and it may have been covered elsewhete in your blog before. I am asking it here but do point me to the thread if it...
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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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Sorry Romy, i can't tell you about life longevity of 6E5P in my amp 'cause i'm not using them there anymore :)For my speakers two-stage SE sounded much nicer, more balanced and clear with more volume. Well at least it was easy to predict, considering...
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[quote user="cv"] 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 ...
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[quote user="Wojtek"]has supposedly very nice Obbligato line of film HV caps . [/quote]
Thanks, the high nominals the have only 630V and they are larger than I would like to have. Does anyone know how those Obbligato sound in PS?
[quote user="hagte...
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nl,
[quote user="nl"] I offered to be of assistance, as I have a little experience in these matters, but assistance is not appreciated so I will be leaving the Kingdom of Romy for more productive environments. [/quote]
where did this come from are ...
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Jim, I have sent you the tubes – it might be an interesting journey.
I send you:
1) 6C33C that was working with both cathodes approximately a year. It is not dead year but it is deep into retirement age. Run it at 220V and 200-250mA full-tube,...
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ml8 wrote:"This few tubes was 6E5P, 6S45P (which i've found a little better for my single-stage amp that 6E5P) and... perfectly god-like sounding (output beam tetrode) 6P6S!!! Triode-connected, for sure. Absolutely the MOST clear sounding driver, and...
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[quote user="Romy the Cat"]Stonily they are very similar in my view with a very slight advantage of 6E6P in delicacy and softness. I do not know what you mean “respond differently regarding vibration.”[/quote]As I had been looking at all these tubes...
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Roman,Thanks for your prompt reply!May be my last wordings have misled you. I didnt mean I was interested in expetimenting gas tube biasing for D3a or another tube. Instead, I am rather interested in putting a gas tube biased 6e5p in front of a ss am...
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[quote user="Romy the Cat"]I was not wild with original San Audio Kit sound, I did not like when I redid is with better parts and I frankly not a hugely enthusiastic about the sounds of San Audio Kit with 6E5P driver.[/quote]After thinking about this...
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[quote user="peter foster"] By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF re...
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Celsius, I think you do not take in your equation the input voltage. If you bias 6E5P with 4.1V then it can pass 4V with no feedback. Since the tube has under normal circumstances 33 times gain then you have 132V RMS from your driver stage, wish is ...
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I've been pushing this intellectual excersise (masturbation?) of solving Romy's constraints on a powerfull bass SE amp.Thanks to Stephie Bee the humanity have now a decent model of GU81M, so before electro-cuttingonself, one can see if the electrocut...
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[quote user="cv"]On the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.[/qu...
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[quote user="cb"] Yes, it is imposable to have + 0.4V on the grid, 0.0V at input, with R5 resistor in place and the gas tubes outputting +150V and -150V. My apologies, I meant to say I have minus 4.4v on the grid with the inputs shorted. Then I...
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Although the spiritus movens of the whole idea seems to have found thebass solution, the idea continues to live.Thanks to the invaluable help of Stephie B, I've comeback to the GU81M likea boomerang with some progress. There are 3 new things:1) FFT v...
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Hi Romy
I have a mono completed full range Melquiades and another only with the bias circuit hooked-up.
The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adj...
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Jim,
It is miniature tube that can handle 8W on plate!!! Still the most interesting it’s sound as triode. If you look its internals constriction then you will see a pair of huge “plates” and a large space for the “electron cloud”, it kind of in a w...
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I was searching for an answer why squire wave is so screwed and I was advised by the site’s visitors that it is due to HF restriction of my channel. My HF response does look too low to me – the 23kHz; with all my ultra low capacitance magnetic I ...
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[quote user="vuki"]Anyway, my plan was to make powerful triode NFBless amplifier for relatively small money. I'm really satisfied with what I did. Maybe I should have done GM70 SE, but what would be my next project then?[/quote] The GM70 is a bitch a...
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Paul, don't get me wrong--normally I'm not choosing a tube by the power, but this situation is somehow special.There are very few tubes which have the right electrical parameters (gm, mu, power, etc) to start with. In thesmall tubes word one can glaz...
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[quote user="N-set"]Romy, may I ask you why you've employed an autobias on 6E5Pin Milq's MF rather than your biasing technique (if there is any reason at all)?[/quote]If you look at the page #13 of the Milq DHT thread then you will see that the first...
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Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving ...
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… I do not consider it as an interesting driver and I have a good feeling that you will review your desire to drive 2A3 with 7788. 7788 is phenomenal for different application (ultra low noise + ultra high Mu) not for driving power triodes. Jim, if y...
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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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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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I do not remember what I sent to you, since I sent you for measurement perpose then it might be the impulse version of the tube. In the image below are vertical tubes from left to right:
0A26E5P-E (smaller)6E6P-DR (larger)6E5P (the largest)0A2
...
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