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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="Romy the Cat"]
Romy the Cat wrote:That sucks. I use to have a box of perhaps a dozen of YO186 but I did not see it for a while, pretty much from the time I moved to new house. I was listening today some of my “critical” reference stuf...
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KOT, with the ML2s I found very little difference in the sound of various 6C33Cs, but the old Svetlanas certainly "held to spec" better (and longer..). I find the 6C33C to be more "direct" sounding than 845 or 211, but this in the context of a 3-sta...
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N-set,actually, as you drew it, it became not too complex amp. What I would like to find is some kind tube like 833 only twin triode. Then it would be possible to have one chassis with a single drive and two output power stages. With 100W on fil...
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Read again, Romy. No burned sockets, and none reported; just dirty pins and then failed 5156s, as reported.While I do have two busy and curious granddaughters one might at first suspect, I now believe that I cracked both 5651s MY...
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Jim it was probably the 7788. This "supertube" was military stockpiled and difficult to get until about 8 years ago when finally military released. Then you could get them for $5 but people are getting wise now as per the $30-40 price...
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I am having a LOT of microphonic trouble with the 7788s in a high gain stage. I run a 40mV input signal into a 7788 triode at 15mA CCS. Plenty of gain, nicel output. But dang, if I bump the tube or board or chassis, the grids inside...
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All you need is knowing the exact length required to ask for the matching diameter. Probably a bike tube will do. You can cut it as a ribbon or in a string shape. This way you'd avoid any discontinuity for glueing several pieces. From one tube you co...
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well fine, my X350.5 does 50 watt class A, and of course in push-pull. I use it with 120 watt max rated 3 way speakers of about 87 dB efficiency. You can see on the 350.5's centre instrument dial if you go out of class A. If I go out, I usually fear...
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[quote user="drdna"] I built this amplifier more than ten years ago, before these other tube companies were in business. I know the Vaic tubes, which the EL tubes are related to. However, I have not tried either tube. Maybe it is a good idea (and I c...
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(Romy feel free to move this post)[quote user="Paul S"]N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with sp...
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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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Hi,[quote user="Romy the Cat"]could I instead of trashing the tube to flip it to the left filament and continue to use the unused part of the cathode, plate and filament? [/quote]Sure you could.[quote user="Romy the Cat"]Theoretically it might be the...
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I'm sure there are many bad implementations of the 845 and 211. Almost all of the commercially available ones are pretty mediocre. However I have heard good examples of both so I know it can be done. I've yet to hear an impressive 6C33 amp so it...
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"SO i read somewhere on the net if we have to mix ss and tube the combination should be tube pre----ss amp and NOT ss pre ------tube amp."Please don't take offense, but this is why I say what I say. No matter how smart you are or how long you've been...
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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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[quote user="Romy the Cat"] It is not a the thread about Allnic but LCR RIAA correctors, still there was something expressed in here about the Allnic LCR phonocorrector… and I feel bad about it. It is not that I don’t think that Allnic LCR phono...
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[quote user="Paul Costa"]Do you know the part number of the Johnson tube sockets for the 6C33. There are two sockets available numbered 247 for $35 or 248 for $30, is there a difference. Do you know.[/quote] Paul, I am sorry I do not remember. I th...
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Anthony, I asked because I could not gauge distance from the tube pins to what I took to be large inductors shown straight underneath them. Distance will do it, but I think the critical distance will vary, depending on the strength and "pattern" of ...
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Apart from "raw" VR's there is also a brilliant solution due to steve bench:http://members.aol.com/sbench/norchv.htmlThe tube must operate in A2 and have high gm,as the shunt impedance approaches 1/gm.I did something like that with choke loaded 811Aa...
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As it so happens I have some melamine here and I cut up 5 x 1" thick discs and pushed them into the middle of the tube (I also trialled 1 disc and 4 discs) and while they removed the resonance they did the same thing as the high density fibreglass ba...
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N-set, I give lip service and a sort of generic consideration to plate curves, but in the end I am not wholly secure in my understanding of this information as it relates to sound with a given tube in a given circuit. My usual basic tactic is to ask...
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[quote user="unicon"]It is right that when you do not have bass problem then why to do any absorption for it ...But how do you know you do not have any problem ? [/quote] I was under impression that my criterion is my judgment if what I would like to...
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[quote]do two tubes at once then it make sense to have one selected reference tube[/quote]I see. Yes, the digital scope option would work. I have one, might try it out. With a 6c33, the VacuTrace has only enough power to trace ...
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[quote user="romy"]send you two 6C33C – a new one and the burned out[/quote]Please do. I have interest in the result myself and don't mind spending the time. I can post photos for each tube.[quote]a trace for the very given tube is “nice ...
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Did you just answer your own question? Use the B2, then. Plenty of nice, small tube amps for tweeters, if that's what you want. I could list tube and SS amps, but I hate doing that "in public", not to mention, as you just pointed out, you only need t...
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I am still waiting for a (single stage) tube that can make full range Music via speakers. I mean, this is the real issue, isn't it? Sure a good tube will pass a "full range signal" through the right transformer; but where is the tube that will do t...
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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"]3) There is an army of the 150V 7-pins gas tubes: 0A2, SG1P, STV150/30, StR150/30, 150C1, G150m 150C2, 150C4, CV10664, CV1832, CV2903, CV8161, HD51, M8223, QS1207, GD150/4K, QS1210, SR56. I did not try the larger octal 150V...
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[quote user="Paul S"] Didn't you first become aware of MF "problems" when you got everything else working better via the PP2000, and the MF wound up dropping back to weak sister status with respect to system-wide PP2000 benefits? [/quote] The PP2000 ...
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No question in my mind that the tubes themselves contribute to the sound we get from tube-based systems. Funny how I go to such lengths to get "quiet" tubes and use dampers even as I realize that even the quietest tubes are doing their bit to/f...
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