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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="Paul S"]"...Obviously I will have to keep a closer watch on the OPs..."[/quote] Paul,Though I don't let my ML2s go more than a month without verifying the bias, once, due possibly to a screwy tube, one ...
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Floyd,
Regardless your preamp uses output coupling cap you would still need a positive supply. Positive supply compensates the negative DC voltage at the amp’s input. Theoretically if you do not connect or disconnect the cable between your preamp an...
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Ronny,
I found is a bit strange that you decided to use the left front leg instead of the right front leg for mounting the third SME tonearm. If any reason why did you do it? I always thought that left front leg is the least conformable leg a...
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[quote user="deemon"]Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can ob...
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[quote user="KOTriode"]Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from b...
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Romy, Sure, the tone could be a bit more special ie: delicate and colorful (sorry for lack of the right word). Thats why I have come back to these pages to read and hopefully understand a bit more and find the right incentive to tinker further. I hav...
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Hi to everyoneyears of reading but never subscribe and post to forumI see that Zarathustra circuit and i m very interested on the first SRPP stageCan someone point out how to implement Melq Gas Bias on that SRPP circuit?I would like to implement a li...
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Hi ShannonI think that Romy have it already on his pre-assembled Zarathustra on this topic's pictures: http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=4121#4121and also here:on post #8http://www.goodsoundclub.com/Forums/ShowP...
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Post #83:
Bias
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by
G
on
2018-04-03
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Hi Romy
I have built a Melq prototype and need some help with the bias.
This is my first tube amp build so my understanding is not great.
All parts values were used as per the 4.4 schematics. Rectifier bridges were built with Infineon SD...
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Hi Romy, Your amp schematic is intriguing. I have a question about the dual supply for the input tube grid bias. If my preamp uses an output coupling cap, do I need plus and minus supplies ? The interconnect will be biased at the sam...
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Hi Dima,Thanks for your comments; please forgive the chaos of what follows as I have to rush!
Agreed on all counts - the dc bias point would need adjustment and monitoring; I supposse it depends on how stable the electricity is from the wall; anothe...
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[quote user="cb"] The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adjust voltage to 0.0mvdc, I get a reading of plus 0.4vdc. This is with VR1 set at maximum (...
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Thanks for the link, Romy. I'll check it out. Too bad there isn't more information about the ML2 available. A schemo with some values would be nice. Do you know if anyone has sorted it out yet?Steve Bench happens to live near ...
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[quote user="jessie.dazzle"]Since renewing all tubes in both ML2s, over the period of about 3-5 minutes, the V2 bias on one of the amps cylcles between .27 and .33VDC. Is this behavior indicitive of a defective 6C33C?[/quote] That is not good. Try to...
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After swapping all the tubes between the left and right amps, the cycling bias current issue (mentioned here in a previous post) seems to have settled.I now have another question, which I hope other ML2 users might answer; first the context: These am...
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Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can obtain 1 V or little le...
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[quote user="Romy the Cat"][/quote]This is a technical post.I've made some progress on my assault on the above version of EAR 834. After hard (mostly because of my idiocy) labouring through the soldering, I've creeped to the level where I can make so...
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I did try it and it was very bad. The Bias Channel did not affect imagine but only made soundstage wider, which was not my intention. Along with the widening of soundstage it made a LOT of other very negative impacts, namely increase compression, mad...
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Paul, below is the Axiom. I must say I've never heard it nor know anything about the objectives behind the amp. I've just found the topology very elegant and appealing. As far as I understand, the diodesare used for biasing rather than resistors beca...
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[quote user="decoud"]I shall try it; do you suggest it as a test of whether or not mating the Milq with the SH50 screws up the sound irredeemably anyway? Rgds, d[/quote] Nope, it has nothing to do with ability or disability of Milq to drive SH50. Mil...
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[quote user="cv"] I've only heard the 801 in class A2, but I can easily imagine that the 10Y or 801 with nickel output would offer the purest possible sound in the 1k-10k range, such that it is the S2's true voice you are hearing. It's something ...
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[quote user="KOTriode"]Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from b...
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[quote user="Romy the Cat"] In here is not the value are important but the concept the you block DC not with capacitor but with an “active” resistor that backed up with positive voltage. BTW, eventually if you wish to go “kinky Milq” and have a v...
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[quote user="Romy the Cat"] Celsius wrote:The problem is that my target is drive a 211 as full amp, and my CD player give a litle bit more than 1v to grid. What do you think 1V x 33times x 2.8 give 93ppV enought to drive the 211. Well, you nee...
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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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Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the regulators. It mi...
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[quote user="peter foster"] By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF re...
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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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[quote user="cb"] The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adjust voltage to 0.0mvdc, I get a reading of plus 0.4vdc. This is with VR1 set at maximum (...
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[quote user="KOTriode"] Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the reg...
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