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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Welll, you still did not express yourself what are the sonic verdure of DHT from your point of view. You are not obligated I juts proposed you to do it if you feel that have any observations on the subject.
[quote user="guy sergeant"] I started by s...
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Welborne, I do not think
that I can give you an expert answer. You see, the gas tube biasing around 6e5p
was in a way an accident. It was something that made the 6e5p to sound very
interesting but I am not convinced that this type of biasing will ...
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I'm wondering if Romy experimented with the feedback resistor quality. His ingenious contribution to the design was to use the purest caps possible as in the feedback loop every imperfection gets amplified. So the next logical step after caps wou...
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[quote user="manisandher"]I asked Dave Peck of Avid (formerly Euphonix) a few questions regarding the Model Two (otherwise known as the PMI). The responses he received from Keith Johnson (one of the original designers of the PMI, head of Referenc...
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Well, I do not know what DHT filament scenario I will choose. I consulted with different sources
http://www.intactaudio.com/forum/viewtopic.php?t=823
…but I still have no definitive opinion. There are few logical cons and pros for...
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Ok, the one channel of the Milq is up and running. The first assembly went fine, no bugs or problems – it worked fine juts after the build. All voltages, delays and heating are normal; this I would need to inspect everything again after it will work ...
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Hi RomyI have one gas tube which regulates at 136v and i put it in both sockets to see the effect. Looks like my tubes running at higher voltages gives me the readings I got. Anyway I bought a bunch of gas tubes and will play with them when I get the...
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Yes, Be, thanks. I have revised the Milq’s start up sequence. With the new scenario when the amp shuts down the B+ will be sitting in the power caps. It does not hurts the tube as they are cold-closed and do not care about anode voltage. ...
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Hi Romy
6CJ3 (or equivalent) is the one you want. Though I've not used them myself, I have pals who regard them highly, FWIW. It has an average current rating of 350mA, but don't forget that for a given draw on the supply, the average current throug...
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Allo,Well, the divider may certainly be responsible for some softening of transients - in particualr, what values are you using there?Also, the received wisdom is that silver micas are created far from equal; no experience with them myself but I beli...
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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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Another rushed post, thinking about Romy's "miles of wire" remark, germane to the giant Duelund caps.I have thought about this sort of stuff for some time, and I have come to the point where I tend to think of all parts as partly obstructive (sorry.....
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Romy,Thanks for the info on alternative manufacturers.
The resistors I found locally seem to be working super well (precision metal film... didn't ask who made them...they are all black and cost EUR 2.80 each). I may eventually replace these with RN...
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Paul, 6E5P may strech very much, but maybe just enough to close the gap. In such a racing car there is a little margin, it's not a usual 10W+ design. Biased at -3.5V 6E5P will produce +40Vmax on the grid, driver driven to the limitThe grid will eat ...
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Thanks Rowuk,I have used resistor switches before. In this case it's for a studio mixer so I want potentiometers. I'll look at the Alps stuff, thanks. I realise that question might not be received as "advanced audio practice" but it fulfils my object...
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[quote user="DHT4ME"]Romy if you feel that you are not loading the tubes enough put a 16ohm power resistor in parallel w the S2. this will cut the load line in half. It should be less wiry and stronger more weighty sound. Obviously you might experime...
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[quote user="Romy the Cat"] Hm, have another strange problem. Sometimes, and completely unpredictable, the amp goes crazy. As you might see I have fast blow fuse in anode line and seldom plate current rises to some crazy volume. In a past I ha...
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Hello chaps,Firstly, something I forgot before was that the high impedance coil will have more turns... so the DCR etc will be stepped down as seen by the voice coil. My guess is that overall it will still provide slightly less damping, due to imperf...
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Roman,[quote user="Romy the Cat"]Tm I ma glad that your “Manhattan project” is over as I was a little scared….[/quote]
As you well know, it ain't over till the Fat Lady sings.The "Manhatten Project" will be back.[quote user="Romy the Cat"]This phono...
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Hello to everyone, am new to the sight. Been reading for a while and decided to mod my 834. I've had the unit since '96, purchased new from the local dealer. I have noticed a few differences from the schematic, the 220K load resistors R10 and R110...
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Yes, this is I was asking for. Then quiescent current per tube is +or- 1.2mA, total 3.6mA through 6K resistor.
As you stated, the power supply you built is like put a jet engine to a Honda Civic, but I have the irons and I like the idea. If necesary...
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The ECL82 = 6BM8 was used a lot in low-end amps, both push-pull and single-ended. Actually, according to your radio's schematic to which you posted a link, they are not being used "one per channel," rather it is a mono radio (nothing wrong with that...
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I have tried the 307A in triode connection in the "standard" no feedback moron 12Axx (in my case 12 AT7) easy configuration with a coupling capacitor and it was "nice". Critical listening was almost impossible, I kept zapping around to find more "imp...
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One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit operating point? So choosing a clo...
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In my upcoming DH Milq MF DSET I will have an Innerstage transformer and output transformer. The loading of output tube has known effect to harmonics vs. transients, it is know, it is predicable and it is manageable. The Innerstage transformer might ...
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Romy, That gets you where you want.. good transfer curve, low distortion and about 2.7-watts output. 2A3 should last a long time. One question and one comment:Question: the 0.75 ohm resistors in the filament lines on the 2A3. Is it your in...
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[quote user="Romy the Cat"]I was thinking about this: how come that driving 6C33C (in fact driving anything one can imagine) the 6E5P was very fine but driving 2A3 it was dull like hell. I opened the amp and tested all – everything was perfect but th...
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The new Super Milq is running for a days, amplifying burn-in tracks; the MF channel is loaded to 12R resistor. After a couple days of disgust even to look at the amp I decide to see tonight what happening with sound now and to my surprise Sound did c...
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Thanks, Jim, and thanks to everyone who replied in direct emails. Summarizing what was advised to me it looks like as now the input impedance of the amp is around 4.5K. That was roughly what I would like to have, though I would like to go even furthe...
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[quote user="ml8"]That's true that this resistor have negative impact on sound quality. You can run your 6E5P without it as long as you do not get parazitic oscillation.Just connect screen grid and plate electrodes right on tube socket, using shortes...
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