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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote]BTW, Jim, when will we see your version of amp with 6E5P driver? :-)[/quote]Well, I have to admit it makes a beautiful triode. Wonderful linearity, low output impedance, and super-high gm. Looks a lot like the 6H30, which was my dr...
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I barely put 40W on this plate by testing. And that's a peak value! The curve sweeping action results in an average power dissipation much lower. The hysteresis is there with maybe 5W average power. And it is only on one side ...
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Thermals, yes. That's a brilliant theory! I need to do some more investigation. The loops are clearly visible during warmup. And switching from one heater to the other is wonderful to watch. I'm going to try and post a v...
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Ok, here's some calibrated sweeps. I ran the tetrodes in triode mode, with G2 strapped to plate through a 100 ohm resistor. First up is the western 6e6p.[img]http://www.hagtech.com/blog/images/6e6p.jpg[/img]I then built an adapter card th...
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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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I wonder what the difference is between class A and B insulation is. Never noticed that parameter before. The 10 amp choke (I like their word reactor) must have some very large guage wire, as the resistance is really low. Clearly, b...
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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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The "gold wire" version tetrode runs fine, now that I have it connected properly. I switched to my better scope, so photos have visible grids. Everything is now calibrated, too. Vertical is 12.5mA per div. Wow, that tube sure ...
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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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Tubes came today. [quote]solve the problem of what we should test for[/quote]I don't think you can get one tester to do everything. Not only does one need the basic parameters such as transconductance, but you have shorts, gas, leakage, m...
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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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Sadly I have never spent the time to try and correlate the sonics of a tube with the trace characteristics. Ok, sometimes it is obvious. A flat line is a dead tube. Normally I measure and compare both sections of dual triodes. ...
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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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[quote user="cat"]Will your tracer be able to pump 250-300mA at 230V? Will it be able to supple up to 100-110V of bias?[/quote]Not quite. I designed it for preamp tubes. But then I realized I could push it to cover a lot of the more popul...
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As usual, they leave out the VacuTrace, by far the best modern day tube tester. Same with the Alan Douglas book (who claims to be an expert in the field). They both mention the Sofia, however - a machine plagued with problems - as th...
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Romy, I don't know what it is, but something bothers me about the way the upper horn hangs. All other drivers are supported from bottom, that one from the top. This is just gut, but it doesn't seem right to me. I get this sick feeli...
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What a concert that must have been. So Romy, how do you handle the EQ issues? The early discs must have been in ffrr or some other non-riaa turnovers. Or are all the discs re-issues that have been remastered?jh...
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But aren't the vented ports out of phase with the horns? Or is there some way to mechanically cross them over with time alignment? Or maybe it just doesn't matter at those frequencies.jh...
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[quote user="smith"]CES yields a very poor ROI[/quote]I will defer to your judgement, as you certainly have done more shows than I. CES is indeed a different beast from the others. Been wondering how I can possibly afford it myself. ...
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[quote user="smith"]What a ridiculous waste of money![/quote]I completely disagree. Let's be honest here, the majority of audiophiles are atypical people (wierd, anal, eccentric, driven, insecure, etc.) and plenty of them require handholding, c...
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I don't know how many coils it has. The XV-1 is their flagship product and costs a bundle, probably $3k to $5k. Everyone I spoke to guessed the splendidness is due to the shape of the diamond (I believe they merely say "line-contact"...
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Ok, so I'm not really going to talk about the show itself, but more of some interesting things I learned. Yes, I did have a room, but that's not the point. I was able to borrow some speakers from Azzolina. They are of the unusual Lo...
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[quote user="caT"]Adding 1uf more and the horn being to sound like Altec horns…[/quote]Interesting. I'm wondering here if this is the key to eliminating the honkiness I hear in most horn installations. From your experiments, it seems that...
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[quote user="romy"]I have quite rudimentary and not very well performing generator [/quote]That's what I thought. I see a point at the tips of the sinewave, a dead giveaway to a ICL8038 style waveform generator. I wanted to see the input ...
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What does the input waveform look like? I see a lot of 2nd order distortion in the output. Also, can you show at 1W output? And when you say 28.5V, is that rms or peak? The scale must be uncalibrated as I can't figure out the ...
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Just got my stereophile in - and there's a letter to the editor from our book author Earl Geddes! He made a good point. Maybe he's a genius and we've not heard of him yet.One thing that did bother me though is that he had to sign the lett...
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Well, I'm hoping the Azzolinas have something going for them. After all, it's not about theory but results. They came recommended as decent, so I invited them to be in my RMAF06 room. Yeah, I committed myself unheard, unseen. ...
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Perhaps the book falls under the "theory of irrelativity". I thought maybe there could be a useful tidbit inside. One good thing about blogs - people may not agree with you - but at least you can safely post an op...
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Is anyone here familiar with this book?http://www.clarisonus.com/blog/?p=85#more-85Wondering if it has any new insight into horn design.jh...
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Interesting results. Funny thing about that sweet spot.One thing you might try is to add the output from a 12.6V secondary to the primary side of the B+ tranny. Out of phase. This can be a resonably small transformer that could fit ...
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