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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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="hagtech"]Note the '63 has much higher gain. The horizontal spacing is basically "mu". Interestingly, the 6e6p has lower gain than both of these. To me, the curves are beautiful. Spacing is relatively constant, ind...
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[quote user="Jack 14"]Hi, these ones are Russian military stock: see that no mica elements have been used in their construction, like the US Bendix Red Bank tubes (used in US ICBMs of the '50's-'60's). Old Soviet ICBM spare stock ?[/quote]It's v...
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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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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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Why do you suggest that a pentode will "give higher audio resolution"? What evidence is this theory based upon?jh...
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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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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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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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[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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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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[quote user="rafaroxlm"]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 mention...
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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="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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There is a tube out there might be a good candidate to drive ULF from DSET
http://tubedata.tubes.se/sheets/127/7/7242.pdf
It is a low voltage triode with 100W on plate, 9 times gain and 80R plate impedance. 3 of them might form a...
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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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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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