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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Thanks, Adrian, as I underused the Dave Slagle is autoformer guy. I have no needs for autoformers as I need purely restive load. I fact it is not big deal to find switch, it is complicated to find a ready to go attenuator. Mike Percy care many ...
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[quote user="ml8"]...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), s...
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How about shunting the 1H choke with 180K or so and changing the 20k to 22k5.... that's a rough calc (should redo for standard values)... will keep the x/o point the same and eat up a decibel......
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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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rather discussing a potential of building a tube buffer around 801/10. I'd appreciate your help very much, especially your sound impressions under various conditions. My mail phixphi_AT_gmail.com
Thank you
...
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I do not know what it is all about as I’m under impression that it you socialize with people on dB-design forum then they will be more responsive about your excitement. I’m not quite sure what the SWING is all about as the guy mentioned and descried ...
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Isn't 330 ohms a little low as a plate load for an ECC83/12AX7 to be running into? 330K ohms perhaps?You often ask what is wrong with a given speaker installation, I thought you might be doing the same here. Keeping us on our toes :)...
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Thanks for the reply. My 834 came from the factory without the 220k ohm resistors. I was wondering if I should go ahead and add them while I still have the unit apart. I purchased Caddocks for the repalcements but alas no where to put them without...
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Alex, as I wrote I use Z-foils at the primaries of mu SUT's. I'm not sure if colder is the world *I* would use. I'm after immediacy and transparency and this is what they gave me. Also widening tonal discrimination, hearable esp with solo piano. ...
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After all, I faced a problem where I did not expect it. The MF channel with no wirewound LPAD attenuator sounds more extended but at the same time not all of that extra HF too useful. In fact, what I hear is that with the series resistor Sound ha...
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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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[quote user="valves"]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 r...
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[quote user="floobydust"] Question: the 0.75 ohm resistors in the filament lines on the 2A3. Is it your intent to drive them from a 2.5VAC transformer or a 5.0VAC transformer. Voltage drop considering the 2.5amp filament requirement would result in i...
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Thanks for the reply. My 834 came from the factory without the 220k ohm resistors. I was wondering if I should go ahead and add them while I still have the unit apart. I purchased Caddocks for the repalcements but alas no where to put them without...
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The hell of it is that you will probably have to peck away at working out your plate and cathode OPs at the same time, since measuring resulting values is a lot easier than actually predicting them. Or, you will probably have to do this if you w...
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[quote user="ArmAlex"]Dear Romy, after a lot of delays I finally found someone technical to build Melquiades. I'm afraid that I may disturb you a lot with questions.Anyhow the first question is:for some of resistors no value for wattage is mentioned ...
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Tax wrote: "Sorry to ask, but where is R7 & R8 on version 4.4 of the attached schematic, is it a deliberate puzzle to test the Moron or a numbering error?"The CaT wrote:"It looks like R7 and R8 are not there. They use to be filter resisters for m...
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Dear Romy, after a lot of delays I finally found someone technical to build Melquiades. I'm afraid that I may disturb you a lot with questions.Anyhow the first question is:for some of resistors no value for wattage is mentioned like R4,R5,R6...R9,R10...
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[quote user="Romy the Cat"]What do you mean the example of inductive Lpad? All speaker level Lpads are inductive. The speaker level Lpads work with low voltage and high current and therefore they use wire wound restive elements. Any wire wound compon...
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I calculated the whole circuit and it looks each channel draw a total of about 3mA (could be even somewhat less). The second and third stage works like a whole and it´s very curious because I have seen this design before only in guitar amps in order ...
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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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Romy wrote :
"...You have too much gain in your playback for 109dB sensitivity... I used ML2 with 109dB sensitively and L2 with 12.5dB voltage divider at ML2 and I had no annoying noise at nearfiled..."
Ok so I made a couple voltage dividers fo...
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Since my resent tweeter projects went through so successfully and since I would like to stay with ability to adjust the tweeters output:
http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=1487
I wonder who makes good L-pads. Currently I use r...
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[quote user="Romy the Cat"]Well, they technically not Lpads but juts regular attenuators
even though they connected in “protective mode”. You can go with stabilized impedance
to maintain the high pass filter over the coupling capacitor to work prop...
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What do you mean the example of inductive Lpad? All speaker level Lpads are inductive. The speaker level Lpads work with low voltage and high current and therefore they use wire wound restive elements. Any wire wound components are inductive by natur...
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[quote user="Romy the Cat"] There is no aspects of minimization
of the inductor size. You can go to 30K, or 50K, or 100K input LPAD. The LPAD (which
is not inductive switched attenuators with good resistors) anyhow sites behind
the filter, so the ...
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[quote user="Romy the Cat"]Sure, there is nothing wrong with a transformer-attenuator if it has a pure restive load but as we know it is never the case. If we need a drop voltage elsewhere then we use resistors, right? We do not we use transformer-at...
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Can someone help me to calculate the input impedance of the 6-chaenal Milq?It is cannot be measured as a regular DC impedance as it is affected by the active impedance and the by positive and negative voltages from the bias supply and the bias compen...
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But here it is. I made this monoblock fit into less than a square foot. It is tight. I use Hammond iron throughout. Their stuff usually works pretty good for power supplies. I have some photos at my blog. [img]http...
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Yes, it is imposable to have + 0.4V on the grid, 0.0V at input, with R5 resistor in place and the gas tubes outputting +150V and -150V. My apologies, I meant to say I have minus 4.4v on the grid with the inputs shorted. Then I unshort the ...
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