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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Ok, so should be burned in nicely. There are some theories around how mylar and similar interwinding materials (as used by Lundahl, if that is the OPT you are using) can need a fair bit of run in. This is more of an issue on eg input transformer...
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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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Romy - Not sure if you mean increase the load above 550ohms, which would give you less power, better damping and possibly less distortion (trade off between how much you need to push the tube and the flatter loadline, also I suspect there is dis...
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Alas, no time for anything at the moment, the listening valuation must await construction of the amps (and speakers...)Also, it is a very custom application - it is designed to drive an array of ribbon tweeters. Normally these have matching transform...
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[quote user="N-set"]Risking that the topic has already been discussed and that I postin a wrong category (Romy feel free to (re)move this post:Is there any sense in trying 6C33 at higher volatges and lower currents?More precisely, I've been wondering...
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[quote user="floobydust"] Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Yo...
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Romy, Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Your first ...
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...yes, I remember. I wonder if it's due to the large (and varying with signal) capacitance of the 6C33 input interacting with the small coupling cap. Hopefully this will be less of an issue with the 6e5p/6p.cv...
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It turned out that I made my Melquiadenisation with 6C33C. Not practically because it is good or bad tube. The choose of 6C33C was partially accidental: in the beginning I was trying to make an amp that would be able to work in multi-app configuratio...
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[quote user="cv"]…. I'm not sure I believe the overall hypothesis, I think it is more a function of the particular high/low impedance tubes he was writing about (300B, 10, 45 etc). But how this translates to neutrality above "levels 1 or 2" is anothe...
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Started building a test board for the "composite" 6c33. Then I realize I could not hook up the grids separately. They be connected internally. So no way to do this test. Not with this tube anyway.jh...
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Allo Romy,Big topic this! I will write something suitably detailed when I get a chance this weekend, but you're right - the transformer is key and one that is optimised for the task in hand is absolutely the way to go and something that not many peop...
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[quote]traces between new 6E5P and used 6E5P[/quote]I can make an adapter to trace both at same time. That will be interesting.[quote]6E5P and 5E5P[/quote]Whoops, you mean one of these has a 5V heater? Which one?I added dimensions to the ...
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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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Hi RomyDo 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.Paul...
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Some facts:The Japanese horn scene uses colored amps like 300B and prefers to buy Japanese amps.American horns are mostly slightly modified pro gear, quite a bit away from the price range Lamm has in mind, so the market there is not larger than that ...
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On a secondary point Romy, since when did something have to be designed for serious audio use for it to find an application in a serious audio system? Did teams of Russians sit around listening to and fine tuning the 6C33 before they started ma...
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Carlosb, I do not remember. It should be written in my
tester but… I need to find the tester. I do remember that I after I spend a
hell of time to figure out how to test the tube with TV2 it I never actually
used my finding and never tested 6C33 w...
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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="guy sergeant"] …there are some decent products out there although it seems that in your view those products are the result of happy accidents … [/quote]
Hm, this is a good way to look at the reality of the things….
[quote user="guy ser...
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[quote user="Romy the Cat"][quote user="drdna"] You are correct, though I believe the subwoofer covers only below 35 hz. [/quote] So???[/quote]So, my thought was that below 35 hz, there are many ways of thinking about amplification. Some might say S...
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[quote user="Romy the Cat"]
cv wrote:
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.Chris, what you said made me to think.
Loo...
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The sockets for 6c33 should be here in a few days. Meanwhile, I fired up the 6ep5s. I labeled them ABC. The B sample ('83) with gold wire has a short or something. The other two look fine A ('63) has a little more output than ...
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Little I know about tube testing.Here is a link to one that can do a test series on tubes at rated voltages, including 6C33 (with extra-cost adaptor, of course), and it will compare sections at once: http://www.amplitrex.com/index.htmlSucc...
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Romy, I'm enjoying this account of Melquiades upbringing. I must ask though: how are you sure that what you are hearing isn't on the recording? Not that I don't believe you, I just wonder if the stuff has been there all along and undis...
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AlloT wrote: "Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakag...
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Morning,I'm not disputing what you heard, but your conclusion that the LF must modulate the tweeter section can't possibly be right. 0.047uF is a -3db rolloff of 34Hz. If you're saying that over 0.68uF was fine, then by implication 0.47uF is not as g...
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Hi Bud,Thanks for the pointers; I already have a pair of vertically sectioned cores wound from a while back, on white nylon (ugh?!) . Not remotely optimal, but if the concept works I will definitely have to try something along your lines. The tip reg...
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Hi,[quote user="Romy the Cat"] I liked the most when I drove the 6C33 plate with 230V. I run all possible currents and… surprise, surprise I ended up at 150mA.[/quote]I find the same true with other power triodes. When comparing operating conditions ...
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[quote user="drdna"] So, my thought was that below 35 hz, there are many ways of thinking about amplification. Some might say SS amplification is helpful due to power demands of horn loaded 18" woofers. To use 6C33 might be a trade off but I do not k...
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