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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Thanks paul for well thought reply. Two things need clarifiication, i am not new to the subject and am a constant and avid reader.Secondly my preference for music is hobby for electronics and pleasure of listening through application of mind and know...
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[quote]around 135-150mA if you use a single cathode[/quote]Hey, I never thought of this. You can run 1/2 the tube at a time! This actually puts it within the limits of the VacuTrace. I can test each side separately.jh...
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Hi there every one.A brief about system. Marantz transport---Acustic Arts DAC II-----Krell HRC preamp-----Krell FPB 600 class A amp---B&W 802.Previously i had a pair of carry 805 SET amps which drived Klipsch KLF 30 any how i was getting a good ...
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Well, I would say that “something is wrong” as what you report it is not how it shall be. I had my doubts about the rational to use 6C33C in direct heating coupling but the “danger” in direct coupling uselessly coming from the plate of the driver...
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The concept of self-testing boot cycle is nice one but it for sure could not be done during the amp booting. Some tubes do need to warm up and reach the cruse temperature in order to be tested, some do not. Some tunes (like 6C33C) in fact is best to...
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I haven't tried to build a Melquiades but I understand tube electronics decently, so I'd like to comment on this problem.The main question is why Domidaw's output tube is apparently carrying 3 to 4 times as much plate current as it should be. It is p...
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[quote user="Romy the Cat"]
Tube traps are mistakably designed as they tend to deal with a very erroneous assertion that it is possible to feel a listening room with some kind of confused and random bass and then to correct the things with...
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At the risk of overloading you... Here are a couple of quick computer drawings showing a version made from 2 inch steel tube... Material cost would be very low. jd*...
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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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[quote user="Romy the Cat"]
I always was kind of afraid of it. Any single zillion years tube I see is “NOS in box”, “measured as new” or “never work”. So, I wonder where those uses up old tubes are gone? Do people trash them or juts sell them “as n...
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[quote user="KOTriode"]Romy,The normal bias for the Golden Grid tube for 200V Plate at 200ma is about 70V-80V for the good tubes, the bad tube read 0ma at this bias, when drop to -30V it start reading some current, but can't get to 150-200ma current ...
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Ok, I do not know what it was: was it DHT, was it 300B, was it some other specifics of this given amp or whatever… but those two aspects that I named: intentional density of colors and randomness of pace are something that I would like to exercise in...
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Was talking with various audio people about the 6C33C I was amazed that people are so clueless about this tube. The people are so filled with some foolish prejudges and faulty notions about 6C33C that I deseeded to put together a brief “6C33C user ma...
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In the thread GM70 vs. 6C33C two year back I have written that the only tube that I would like to trey in Milq besides 6C33C would be YO-186.
I am not sure that it might be a right direction or even interesting direction but I picked yesterday a par...
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Hi Jim,
Romy may not have noticed that the tubes are mounted to the circuit board below the top cover and not at the surface, so the driver in particular looks shorter than it really is.
Will the final appearance be similar to the prototype in th...
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I don't suppose the input tube was a 437A?And perhaps (at that price) silver trannies? I have never never knowingly heard silver trannies (apart from my Ortofon step-up), and I wonder why anyone would pay that much for them when amorphous ...
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I ordered today from them the 6C33C dumpers and spoke with someone in there. Forthrightly speaking it sounded kind of ugly when the guy on the phone insisted to call the pads as the “anti-vibration instruments”. BTW, I did ask him directly if there i...
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Hi Romy,
Well, I see in the photos what look like the newer Herbie's Hal-Os with the titanium rings on 2 of the 6C33Cs. Have you made any observation of the sonic effect of these things yet?
Rgs,
JJ...
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the less you know about...So, how do we go about screening tubes for audio, particularly audio signal tubes? The only person I can think of who claims to have found a specific testing paramerer for this is Roger Modjeski, of Music Reference and...
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Yeah, I'm a little slow here. Had very busy week pumping out machines. I do have two custom tube adapter cards built. One traces two separate 6e5p at same time (great for comparing). The other is for 6c33. So it's just a...
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application far more sensitive than simple line linestage and in addition to that ,that pre is percived to be colored and syrupy tick. Are you trying to cover up that harsh and cruel sound you're talking about ;) Could you kindly explain why pe...
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Jack, thank you very much, it was very informative. As I understand all 150V regulators use violet-glowing gas. In my case those tubes cares 22mA and it looks like (so far) they do hold stable voltage with no noise.
Once again, thanks,Romy the Cat...
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For better or for worse, I also tend to think of the "tube buffer" as a gimmick. I wonder if one of our readers has an idea, what are the benefits of the tubes used in this case? Why not a discrete version of the op amp, or just a decent modern op a...
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If you don't already know of it, here is a link to interesting German site (in English as well) with loads of info on Tube testers : http://www.jacmusic.com/Tube-testers/index.html If you scroll down to this phrase : "SHORT OVERVIEW OF TUBE TESTER FE...
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[quote user="hagtech"]I have not tried this tube yet. It might push the limits of the tester. The 6.3V heater current supply is nominally rated at 5 amps. It might be ok to push it to 6.6 amps. I have to think about this, make...
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I have not tried different loads for the different driver magnets but i also have not played with fix magnets for a will.one thing is changing load to the tube really only makes a big difference in the bass regions on a mid driver the load may chang...
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One of my YO186 have developed a dark eye on it’s getter. Even the tube still measures fine and sound fine but I wonder what make some of those tubes to get dart spat of the getter gloss. I have seen it before and do not have any association between ...
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Last night I was listening Zubin Mehta’s recording of Bruckner’s Symphony No.9. It was his first recoding from 1966 with Vienna. I am not a big fun of this performance all together but it has spectacular first movement. It played superbly slow and s...
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Romy,
I have good confidence that it was the tubes and not the circuit. I have checked the cathode driver that bias the 6C33C and there was not any problem. Sure if the cathode bias failed, the 6C33C current will shoot way up and burned up the fuse...
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Just in time. After about 5 hrs of music on the preamp , I received today the 3 golden grid tube. Looking with a magnifying glass, I could not determined if it is gold wire. Anyway, I am burning the heater and will try out tomorrow. Here are some pic...
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