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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Ha-ha , Roma , it is very good ! ;-) I will make a good copper plate with this name and attach it to my phonostage ....... ;-) Dima...
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Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides ... Dima...
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Of course , if you need low pass , the chamber won't help .... but in seems to be that there are no good solution in this case . Too narrow bandwidth , and it will sound like a barrel :-) . Dima...
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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="AnonymousUser"]I appreciate your patience with my electrical questions.As a good friend mentioned to me when discussing the unsolved mysteries of tubes amplifiers "I look out at the stars, the God Of Triodes winks at me, I know ...
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Grid leak bias is not reliable itself . Grid current is very low and grid resistor is very big , the circuit become very sensitive to all destabilizing factors - capacitor leak , humidity , temperature . And when we apply a big input signal to t...
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Dima, thank you for your explanation.I would very much appreciate understanding "the inner-reasoning of the processes and . . . about the theory of the Melquiades and under-hood". I am sure that there are many other people who would also b...
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Dima, did you & Romy experiment with contact-potential biasing of the second stage before settling on fixed-biasing? My Spice files are on my old computer and effectively lost else I would run simulations out of curiosity.Brian....
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[quote user="Romy the Cat"] I think I need to put a switch that would disconnect the right and left primary in case the Mono SPU is used. I ‘m still thinking about a more elegant solution…. [/quote]
Well, it is resoled and it is resoled remarkably s...
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> The second that Dima proposed was to run 6C19P as default shunt regulator.I was thinking about 6S45P as a shunt. With its ~45mA/V of gm it would ideallygive the impedance of ~25 Ohms. 6S19P has low gm of 7.5, giving in the ideal situationimpedan...
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[quote]a sufficiently-large last capacitor with using in input choke make the sound or transformer, rectifier and choke less relevant[/quote]I have to agree with Dima. The power supply has to be harmonious with the amplifier yet separate at the...
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Adrian, Romy, (Dima), First, I most certainly agree that the textbook operating point for the 2A3 is not optimal and can be improved on, hence my own design from a few years ago. If you are sticking with a 2.5K load, you will simply not ge...
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+++++++Pretend that we have a good mass platter and this platter in addition it it’s mass has a large circular chamber near the outside skirt. The chamber or the channel is 50% filled with some kind of heavy liquid.++++++++Good idea , Roma ...
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I consulted Dima and he expanded to me how lighting propagates itself in space – very fascinating subject. It looks like the PP3000 protection is absolutely irrelevant for lighting. I wish could have somebody to blame
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Hi Dima,Do you know if this is similar to the approach Tim de Paravicini took in his direct-coupled amp placed inside a Quad? I'm currently using Quad speakers (I gave up on the horn approach through sheer frustration) and it seems to me that this is...
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Yes, Chris, thanks.
I understand how it works, the same Newton Bias only on the other side of the driver’s tube. Dima have proposed something similar in past and last nigh we discussed with him what you suggested. He was planning to post his commen...
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Yes, I ma very enthusiastic to see what resume I will get. I would not use a single-stage amplifiers with low sensitively speaker. Low sensitively speaker and high sensitively speakers are different school of thinking in term of amplification. They h...
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[quote user="Brian Clark"] I have some ZVN0545A mosfets here for exactly that purpose of replacing cathode followers. You may like to try this starting at 2mA (250V supply, 125k biasing resistor). [/quote]
Brian, and how do you find your MOSFET beha...
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[quote user="Bud"]Perhaps this link and the information trumpeted within will help on this project. Certainly the leader of this pack has solid credentials in HF switching power supplies, though this particular link is actually about roasting transis...
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Hi,[quote user="Romy the Cat"] After some experiments and still being dissatisfied with the HF I ended up consulting with Dima. He spread me a theory according to which the HF was killed by my coupling Silver Mica cap. All my arguments that sil...
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[quote user="jessie.dazzle"] After observing a pair of AK151s operating in free air, though only lightly driven, I just don't see how they can possibly generate so much pressure, as the cone barely moves! [/quote]
Why shout they move? One of the ide...
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Yes , the idea of time delay machine is completely clear now . I made some experiments with analog and digital parts of the circuit , ewerything OK , and I need to assemble all the parts together , but now I am finishing the new hybrid class A amp - ...
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Hi,The tech guy asked for 2800 euros for a monoblock pair, and his project wasn't really the same what Romy and Dima designed, it had some modifications that I wasn't sure wouldn't spoil the results. On the other hand my speakers aren't as sensitive ...
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Floyd,
Regardless your preamp uses output coupling cap you would still need a positive supply. Positive supply compensates the negative DC voltage at the amp’s input. Theoretically if you do not connect or disconnect the cable between your preamp an...
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The 834P is a wonderful phonostage. Find the Thorsten’s Modification Guide: http://db.audioasylum.com/cgi/m.pl?forum=vinyl&n=108318 or just build one yourself. The 834PT delivers very-very good results, particularly with the punchy “cartrid...
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[quote user="deemon"]Hello , Roma ! And what is the name ? I wanna make a label on my unit :-)[/quote]Dima, as the source for my linguistic inspiration I used a book that I know peaty much by hart - of the greatest book even written - the Thomas Man...
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[quote user="deemon"]Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neut...
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[quote user="deemon"]Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neut...
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I have some ZVN0545A mosfets here for exactly that purpose of replacing cathode followers. You may like to try this starting at 2mA (250V supply, 125k biasing resistor). Did you or Dima try Soviet SSG silver-mica for the first coupler? I am using 0.1...
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Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can obtain 1 V or little le...
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