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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I read about the GU-81 penthode. It's probably a good possible solution, thank you.I haven't so much experience with penthode, from my very few experiences, I felt better with triodes (DHT or IDHT), so I prefer don't take any risk.I feel more and mor...
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Romy, I was asking questions here, and @ RMAF because I'm trying to gather enough information to build compression drivers. At my day job I am a prototype machinist at Los Alamos National Lab. I don't plan on going into production, j...
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[quote user="Iraschwips"]I don’t have any way of testing but the speaker is supposed to present a relatively flat 10ohm load. [/quote]This is an excellent tool for measuring the impedance load of your loudspeaker. I have one and use it all the time....
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I Forgot they did this. I only have experience with se driver stage. You would remove r3 and c1. change r2 to 10k and put the bias voltage from the gas tubes across it. I would try just regualar zaruthstra srpp circuit first. Like do you know it wi...
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I do not nave, neither I see in the schematic, a resistor
but rather an Lpad shunted with two resistors, exactly how I described above....
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Romy, I am not clear why you would worry about DC if you can set the RC where you want it and mute input.Biggest problem, of course, is HF, since it takes bugger all to blow those ribbons. But I thought you had that variac that the Serb gave yo...
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Options are limited here... looking at the schematic, you're sorta pinned in by the biasing topology used. One typical method would be to use a resistor divider network at the input grid to the 6E6P. Problem is, this results in a huge bias offset. By...
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Hi Skushino,1) In your post above regarding certain(?) of Bruce's products, can you please identify *what* crossover parts you received or heard (in context of given system) which you feel are "low quality" ..?2) Which model & ...
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[quote user="Romy the Cat"]That is a good question and I asked myself it numerous times. My current standing is the benefits are purely intellectual as I am not able to observe the applied benefits. [/quote] Recently I got eventually the box (th...
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The usual "trick" to "stop inductance" of wire wound resistors is the "old double-wound trick", like those offered by Mills:
http://www.soniccraft.com/index.php/resistors-mills-c-29_53
(and I think it is much the same for capacitors, for that mat...
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BR, I have never used Romy's amp design, but I have used 6C33C SETs with Lowthers. I do not use my Lowthers FR, for reasons that are fully explicated throughout this site, so I don't worry about LF from those drivers. IMO, their best is MF up to tr...
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[quote user="Paul S"]Anthony, congratulations on getting your project to this point! I mention without referring back to your schematics, I think you will be glad to have test points, along with variable resistors (trim pots) to re-set operating poi...
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Romy,My DSET amps are still open (no top plate) so are fully ventilated, but I have left vents in the top plate around all of the valves and installed two computer fans (running very low speed) that push air from the bottom and out the vents on the t...
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Preferring transformers to resistors.
Brian....
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Hi,[quote user="Romy the Cat"]All that I need was some kind of vacuum tube buffer that would have no-gain of a very low gain and that would be sonically completely transparent.[/quote]Completely transparent is very hard to do. Try the following:6AS7 ...
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Ok, here is what I end up with. This version is something that I am planning to give some listening, the fist listening as I this filtered down the intellectuals reasons do not listen it. The amp is fully operational, bit made as a test amp inside th...
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If you have nothing more than low hiss, as you describe, then you are probably about There. In my experience, at any rate, it's either some hiss or some hum, compared to true silence, like the ML2, etc.Do not give up before you try all parts hard wi...
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Wow, you sure do pack it in there! I like the way you silicone the caps and other things into place. Maybe you can do the same for the bleeder resistors and wiring bundles? That is, once you are sure it is operational. Wires c...
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The new Super Milq’s input with combined filer and bias resistors.
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Hi,[quote user="morricab"]Hmmm....I guess I can't really see that unless you are enjoying a particular coloration you are getting from the TVC.[/quote] Nope. On this you are wrong. Based on direct bypass tests the TVC's I USE (that is the specif...
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Hi Thorsten,
"I agree. I
have to note that even in active preamp I/We (the we are friends from
the London Live DIY Circle) tend to prefer TVC's over resistors."
Hmmm....I guess I can't really see that unless you are enjoying a
particular col...
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[quote user="hagtech"] Maybe you can do the same for the bleeder resistors and wiring bundles? That is, once you are sure it is operational. Wires can be like guitar strings. [/quote]
Actually I do some sort of things. What I am done (I’...
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Jessie, I have two comments/questions.
Are you sure that using the USB you do not use the sound card? I am a software guy not a hardware guy and with my limited understanding I presume that an application that reads a file must talk to so kind of dr...
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[quote user="Romy the Cat"]Anthony,
First, your measurements again the “appropriate load resistor” has very little practical meaning. The
drivers is a dynamic system that has impedance not resistance and the impedance
varies with frequency. So...
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[quote user="Paul S"]The usual "trick" to "stop inductance" of wire wound resistors is the "old double-wound trick", like those offered by Mills:
http://www.soniccraft.com/index.php/resistors-mills-c-29_53
(and I think it is much the same for capac...
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[quote user="RonyWeissman"] I didn't realize that there is no balance control on the unit. I know in theory this should not be a problem, but I miss this feature for several reasons. Can't have everything when you buy on the used market t...
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I have a 10KVA Isolation transformer that feeds on two separate 8 ga cables running direct from the house meters into an breaker into de transformer. This breaker is the one I use to turn my system on and off. The Isolation transformer recieves two ...
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Contemplating now how to organize biasing for 3 singe stages of my 6-chanls amp I was faced the dilemma: do I need to bias my tubes. The 6E5P/6E6P are Russian tubes and it means that are very different right from the boxes. The Milq, driver tubes, be...
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Hi Cat[quote user="Romy the Cat"] However, here is where the trick begins. Putting the headphones on, playing them along with the big loudspeakers system and adjusting the volume of the “big system” (primary the LF channel) it is possible to take the...
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Your comments are quite funny and contrary to the facts. Romy can hear, as I can too, the difference between solid state amplification and tube amplification because his system is properly setup and can resolve all the nuances. The slightest com...
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