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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Thanks for the comments Romy. Would appreciate pointing out where the schematic is for the 7788 phono preamp or even better your friend´s 7788 mic preamp schematic. I can use the phono stage circuit minus the RIAA as a starter and th...
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[quote user="Romy the Cat"]OK, here are some follow up thoughts after the completion of the project. I am sure I will burn it for a month or so. I think everything will be fine, I do not expect any issuers technical or sonic. The way how the entrance...
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Romy, doesn't Tim de P also use this cool Miller capacitance idea in his never-mentioned "high end" tubed corrector? Also, do I remember reading that he runs both channels through the two halves of the same twin-triode 9-pi...
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[quote user="Paul S"]So what are we to make of a product like the ML2 amps (using them here only as an example, not a topic)? I have to say I more or less took a flyer on these, since I never heard them in a system I could stand befor...
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We just return from our walk around Winchester’s lake were I saw a very rare car. It is vacuum tube driven. I know that you feel that I BS you but I made a picture to prove the point....
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[quote user="Romy the Cat"]The contemporary productions DHT tubes (Russian of Chinese) are superbly firm and have no internal noise when they shacked or hit. The mintage 60 years old tubes what you make the “close to ears” test responses like as some...
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[quote user="Paul S"]Back to APS troubles, I can't help but think that some plain, old-fashioned, forthright honesty would go a long way. I recently read some posts from an APS wonk claiming outright to an HT group that there is absolutely no di...
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[quote user="be"]Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?[/quote]
I would be interesting to know how much plate voltage (and power) 6E5P would have with no bias. If ml8 would promi...
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With this tube I would think cathode emission limits lifetime. Stepping back a moment, I'm guessing this tube is designed for radar operation. Maybe in an aircraft. The spec sheet definately talks only about pulse mode of opera...
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Taras Oleynk aka “ML8” sent me a couple months ago his measurements of different driver line-level tubes including the Melquiades’s diver tubes – the 5E5P. I am posting his data here with his permission, including Taras’ statement that is JUST PRELIM...
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What would I do if I move to a much larger room and the power of Milq’s full 6C33C would not be enough? Surely it would be possible to go for transmission tubes but they all high plate impedance and high voltage. If I parallel all my bass drivers and...
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The switching UHF spikes that were SS rectifiers main “issuers” are gone. Schottky Diodes with no forward or reserve recovery always did the best but they never were able to care a lot of voltage. The new denegation of Silicon Carbide Diodes ar...
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[quote user="hagtech"]You are lucky to be able to bask in such luxury! It is one thing to build an amp for yourself, constantly tweaking and upgrading. Quite another to design a machine for public consumption, at which point things like r...
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[quote]Will the final appearance be similar to the prototype in the picture?[/quote]Yes, I can't imagine it changing much. Parts may change, but the layout is fixed. Size of box is 10x10x4 in inches. Weight, I think is only 15 pound...
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I assembled SUN 2A3 amp for my friend and found it to be quality kit and very easy assemble. Kit was old .I think late 90's so maybe quality deteriorated since then. I have variety of 300b Czech tubes and (Eml 300b , KR 300BLX 842VHD ) bought t...
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I am playing with the tube traps and at this point I have a dual feeling about them. They are absolutely phenomenal HF absorbents, in fact much more powerful than any other tools I have heard. They suck HF from the room with a force of a good co...
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[quote user="Serge"]Looks like a good solution, this. To make the fabric-covered pipe more reflective you may spray-paint the fabric, I think. [/quote] I read last night the ACS papers, patent and learned how the tube traps work. To my surprise they ...
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I agree i have been making mistakes even costly ones. I had taken the biamping route with cary and krell on B&W , and that was the purpose of getting both the amps, to get the best out of both ,,,,,,it turned out mixing oil and water,,,,,the most...
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I did not follow up on the issues relating to improved performance on small smps when used on filament and DAC power supplies.Here goes:The first is that the source impedance of this type of supply is very small e.g. less than one ohm. The sp...
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I am hoping someone will comment on the tube driven output stage topology vs. the conventional solid state output solution. Is it possible to squeeze more out of the 16/44 format with a tubeoutput? The phrase is kind of problematic, maybe "overcome t...
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Thank you Joaco for your reply. I was hoping tubes could ameliorate the brutal sound many CDP exhibit. I was at an audio fair recently and heard a Tentlab player with the Philips CD Pro mech and tube output that had a kind of gentle sound very unlike...
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Adrian, I wonder how you wound up with the never-mentioned FET 10? FWIW, it was one of the better all around phono stages I've heard, and - not that it matters - I prefer it to the EAR 834 I heard. Is this another case wher...
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While I have found the Amperex globes act more consistently than the Bugle Boys I wouldn't call the Bugles uniformly bad. I wonder if they just don't match up with current amps as uniformly as the later Globes? I have a stockpile of GE longplates fro...
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Why do you suggest that a pentode will "give higher audio resolution"? What evidence is this theory based upon?jh...
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[quote user="Romy the Cat"][quote user="drdna"]As I had been looking at all these tubes I began to also inspect their interior construction. This will amuse you: one thing I would do is to hold the tube right up to my ear so the glass would be touchi...
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AlloOn 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.Given that 12k seems ...
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Whonna to drive dead woofers with single ended triode? Get the Bell Laboratories 320A tube.
The 320A Vacuum tube was designed for use as an oscillator, modulator, or amplifier at the higher power levelsand high frequencies.
Filament ratings: 35 vol...
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I tried listening for a while this morning, figured the electricity was not good enough. When I went to switch off the amps, I immediately noticed that BOTH 5651s had failed spectacularly, with cracked bases and "white-out" on the top...
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[quote user="Paul S"]You have said that there are no "good" 6N6Ps; but are some physically constructed better than others?[/quote]
Nope it was not what I said. I said the all 6N6P are equal, at least among those that I have seen and there are no rea...
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My first guess would be that the hiss you are getting is "tube rush" form upstream rather than an artifact of any resistor/voltage divider. This may mean you still have too much system gain. Again, properly tubed ML2s make NO so...
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