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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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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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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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After 5 years of using the YO186 for my MF channel I think I need to find a replacement for YO186 as I thin k the tube got used up. I feel that my MF does not have the color density as it use to have and some contrasts become in a way more subdued. T...
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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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Scott, my apologize, but issue of low-power does not have any relationship to the problems, you have described. The problems could be located in the following areas:- high output impedance of the last cascade, and amplifier in g...
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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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(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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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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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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"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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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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[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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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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Maybe I was a little hard on these tubes. I have this habit of listening to noise floor at extra high gains. Maybe 20dB above loud. It is part of the design process for me. I like to hear all of the hiss, whine, buzz, hum,&nbs...
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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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[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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Potentiometers:
Paul S wrote:"...I could not get the current below 390 mA, even though the pots still turn freely
... How good are these pots? Do they actually have "stops", where they won't turn any further? Again, I ask because it...
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Laurent:I would be VERY careful about "rocking" the 5651 in its socket in an attempt to establish better contacts. I have "split" the glass envelope near the pins on a couple of 5651s doing just this and I did not realize it until the sound got scar...
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I think low power ss design is the only way we can make ss to sound good. in my idea all high power ss design i heard had no emotion in their sound in comparison by good SET designs like AN UK Ankoru.the first SS design that make me happy in comparis...
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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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Putting the Pure Power in the basement might be fine, but I don't think you need to banish the Melqs down there, at least not yet.You don't know yet if there will be kids, and if so it will still be a couple years before one arrives and becomes mobil...
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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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