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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hello Romy
Looks like you may be about to set us off salvaging smoke alarms (like that boy scout a few years back) ;o)
An idea that I haven't seen explored yet for low level stages is the use of Peltier Effect heat pumps to cool the valves. As ...
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[quote user="Romy the Cat"]From what you describe I can conclude that your DAC is not good. You said you use DIY wireless DAC with tube output. I do not know what wireless mean in this context, but it is not important. I also know do not like any tub...
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[quote user="Romy the Cat"]A few post above Bill mentioned that he run his PP2000 from AdeptResponse power conditioner. I am not familiar if AdeptResponse helps to separate one PP2000 effect another. I am not also familiar with AdeptResponse its...
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What you guys are missing is a grand scale of the concept. You are talking about voltages, implementation, electric chairs and the rest of irrelevant crap but I am talking about the pure inspiration from the concept. No one runs to solder anything. I...
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[quote user="TonyB"]The differences between the battery operation and AC operation are to be expected.One case is isolated (hopefully) from AC, the other case is not. If anybody thinks otherwise,they are fooling themselves. [/quote] Tony, the fact is...
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Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from being best for the 6C33C...
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Hi Romy,
I currently use a 3 stage transformer coupled amp with 112's, 71a's (as drivers) and your favourite 300B output valves:-) I'm not sure whether I'd go back to a capacitor coupled amp. I just acquired some Tango NC20 IT's to replace the NC...
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[quote user="cv"] Consider a triode connected 13E1. 95W dissipation, will probably work beautifully with the existing OPT if you adjust the gap down and if you can rewire your arrays to present a somewhat higher impedance.Something like 400V-450V / 2...
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Latterly is have been some controversy with new Placette output impedance, it does not look like it is 3R but rather 37R according to my measurement. I need to clear it with Guy. I also desided to address (since the Active Placette is a discrete op-a...
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I can only offer a simple solution to this problem.Decide on which row you wish to place digital services. I would also include anything that has a switched mode power supply because of the Y capacitor thing. Assume Row 1 will be used for digital s...
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This is classical common mode noise interference on a common supply. This type of noise will pass right through any power conversion technology and in both directions. Due to the timing variations, I would expect it to be a little bit of mains inte...
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Today I was listening music and after about one hour there was a big bang and my hole system was dead.My unit worked well for about 6 months now without any problems, out of the sky it blow up!The home main fuse of 16 Amps was blown-out but the 1...
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[quote user="Bud"]Yes. Their is a direct correlation between surge current and dielectric materials dielectric constant. The voltages in question are high enough to use a thick dielectric material and just as with the effective resistance of the capa...
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Lx_, it is so and not. I never made a secret that PP has some sensitivity to line before it but for the people who do not use it the degree of the comment would not be possible to understand. Even for PP the relative degree of the comments like my co...
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Hi all, Just joined the cat house... funny seeing the mention of some old stomping grounds here... like Bendix in Red Bank, NJ... they were one of my accounts back in the late 70's. As some of you may know, the U.S. Army's electronics center was...
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I will address the low voltage DAC power supply first since it has multiple applications.The front end comprises a commercial 48/12 volt 20 watt dc/dc converter. This basically is used to provide 1000 volt isolation input to output otherwise you...
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[quote user="floobydust"]Plate supply = 350 voltsOPT Primary impedance - 3.5K
Cathode bias resistor = 866 ohm
Cathode bypass capacitor = 50uF
Grid resistor to ground = 249
You need to select a new OPT.... I would suggest the H-20-3.5U.[/quote]I b...
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Hi Cat,
[quote user="Romy the Cat"]I used my typical “flash” techniques and discovered some leeks in that 50 years old enclosure. Sure it the leaks were there then it would be no “acoustic suspensions” and the driver would run further. So, fixed the...
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Ok, can somebody to elaborate on the judgment which filter is better in case it is a corrector that acts in the middle of auditable range, let say from 1000Hz? It is the same filter but let look at the theory of judgments.
1) ...
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[quote user="Romy the Cat"]
First of all, guys, can you name your posts on more identifiable way?A few comments I would like to make. I heard that the new revision of PP2000 has fans that do not run at full speed all time but have the speed of fan...
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[quote user="Paul S"]Adrian, as a purely practical observation, I just re-read your examples of the format you suggest, and I have to say I would need a good deal more information than that before I could figure out enough of what was going on with t...
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[quote user="drdna"] First, I do not accept the hypothesis. We must confirm that the Avicenna was working correctly when no impact on the sound was made. It has happened before that a simple mistake in observation led to a faulty hypothesis. It must ...
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[quote user="cv"]I wonder if it is the reactive components (blocking caps etc) that are to blame here, seeing as much of the problem is in the lower bass.[/quote]Chris, what you said made me to think.
Look, the output of Bidat and a SS buffer that b...
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Or whatever you call it, it says there is no sucha option that I make a connection error, but hey..., I'm 41 years old and I know from experience that sometimes this voice is wrong ...
As I mentioned, I am not in the apartment at the mo...
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I recently spoke with Paul Eizik regarding the criticality of the open-air mounting of that driver instead of baffle-mounting. I decided to go extreme and to get rid of that plate that I had under the driver no mater now small it was, also I thought ...
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You do not have a single capacitor on that ribbon as your
cap acts as a second order filter along with the ribbon built in transformer.
You might want to push the ribbon further then 12per octave that you have. I might
not do it if you are “satisf...
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[quote user="Axel"] I hope I got this right when going through this long thread with LOTS of information. Did you mention for upper-bass cross-overs Elko’s (electrolytic) only to be your preference? If I have it right, any special preference at a...
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[quote user="Romy the Cat"]Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source?*1 I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bi...
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[quote user="Paul S"]Adrian, I wonder how you wound up with the never-mentioned FET 10? I prefer it to the EAR 834 I heard. Is this another case where it's full of old caps? I would not be at all surprised if futzing with those caps might yield as ...
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I made further experiments and listening and now I have concluded that I am very comfortable Yamaha T-85 Multiplex decoder and I have sold it to use it as a default multiplex for Rohde & Schwarz EU-6201. I made a few modifications in T-85 Multipl...
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