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Read the Post in new Window Read the Post in Threaded view  Post #5: Bias or do not Bias – what a qeston!!! by Romy the Cat on 2007-08-28 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #87: Milq bias vs. batery bias by be on 2008-12-28 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Hi!Could you tell a bit about how does this:"I end up with 360V on B+, 15K plate load, grounded cathode, 160V on plate and -3.5V on grid via a series battery."sound as compared to the normal Milq bias?Thanksbe...

Read the Post in new Window Read the Post in Threaded view  Post #22: Reliability and stability of 6C33C? by Romy the Cat on 2011-09-15 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Well, I would say that “something is wrong” as what you report it is not how it shall be. I had my doubts about the rational to use 6C33C in direct heating coupling but the “danger” in direct coupling uselessly coming from the plate of the driver...

Read the Post in new Window Read the Post in Threaded view  Post #184: R4 is the Culprit by anthony on 2020-07-26 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
Thanks for your help Romy.  Have a look at this (barely legible) sketch so we have a common reference:This is Channel B First Stage bias circuit.  All is identical to your published schematic apart from R9 which I had to increase to get the other sta...

Read the Post in new Window Read the Post in Threaded view  Post #134: The bias by anthony on 2019-01-01 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
Hi Romy,Further to my earlier message, I've measured the bias voltages for the driver tubes in all Channels.A -4.3V not adjustableB -13.82V not adjustableC -4.8V not adjustableD -4.2V (ran out of potentiometer travel...may have to adjust a resistor)E...

Read the Post in new Window Read the Post in Threaded view  Post #13: 6S45P zero bias by be on 2007-04-25 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?Rgds. be...

Read the Post in new Window Read the Post in Threaded view  Post #9: The Melquiades bias: some history. by Romy the Cat on 2005-12-03 
Browse the content of the threads in new Window  Thread: Headphone amplifiers. Baby Melquiades? in Melquiades Amplifier  27 Replies 
[quote user="Chirag"]The 6E5P is an interesting device (I did some research after you dropped the "tetrode" hint and bought a few :-)), but the bias scheme with the OA2's is still incomprehensible to me.  [/quote]Ok, I will try to explain. The...

Read the Post in new Window Read the Post in Threaded view  Post #1: Bias help by cb on 2007-10-09 
Browse the content of the threads in new Window  Thread: Bias help in Melquiades Amplifier  96 Replies 
Hi Romy I have a mono completed full range Melquiades and another only with the bias circuit hooked-up. 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 adj...

Read the Post in new Window Read the Post in Threaded view  Post #5: It looks like you problem with bias are over. by Romy the Cat on 2007-10-09 
Browse the content of the threads in new Window  Thread: Bias help in Melquiades Amplifier  96 Replies 
[quote user="cb"] 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...

Read the Post in new Window Read the Post in Threaded view  Post #151: Cycling bias by jessie.dazzle on 2010-01-10 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
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?jd*...

Read the Post in new Window Read the Post in Threaded view  Post #137: Combined Injection and Bias Channels? by Romy the Cat on 2010-04-25 
Browse the content of the threads in new Window  Thread: How to USE “Resonating Oops” in loudspeakers in Horn-Loaded Speakers  184 Replies 
Hm, in an idea come to me today I think I will try very soon. Why do not combine my Injection Channels with Horizontal Bias Channels? Since my Injection Channels have HF transducers then it will introduce a tremendous lobbing BUT… But my Injection Ch...

Read the Post in new Window Read the Post in Threaded view  Post #2: Re: Bias question by Paul Scearce on 2005-06-23 
Browse the content of the threads in new Window  Thread: 6C33C myths: audio Moronometr. in Melquiades Amplifier  3 Replies 
I've never tried anything but self bias. Do you think fixed bias is better in every case, or does it depend on the output tube? Paul...

Read the Post in new Window Read the Post in Threaded view  Post #3: Re: Grid bias power supplies response by AnonymousUser on 2006-03-02 
Browse the content of the threads in new Window  Thread: Grid bias power supplies in Melquiades Amplifier  3 Replies 
Hi Romy,Thanks for your response! I have never tried grounding the cathode in any of my tube projects. Even my amp output stages have been mostly cathode biased. But I am going to try grounded cathodes (and the +/- input stage supply) in my next amp,...

Read the Post in new Window Read the Post in Threaded view  Post #24: Zero inspiration bias by N-set on 2011-03-24 
Browse the content of the threads in new Window  Thread: How to get a LOT of SET power. in Audio Discussions  106 Replies 
Some people bias 833 at 0V. Some in A1 but to get teh stated powerit must go into A2. Do you or anyone have normal plate curves for 833 instead of that multiampidiocy usually published? Say up to 200mA. Same for 304tl.Outpur tranny--this is the funct...

Read the Post in new Window Read the Post in Threaded view  Post #84: Bias by N-set on 2011-05-23 
Browse the content of the threads in new Window  Thread: How to get a LOT of SET power. in Audio Discussions  106 Replies 
Paul, again the diodes are there not because they are diodes and one needs a diode action there, but because they wanted to substitute cathode bias resistor with something that would have a big static resistance (to set the DC point and stabilize) an...

Read the Post in new Window Read the Post in Threaded view  Post #10: Without bias by be on 2007-04-25 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
ml8 wrote:"This few tubes was 6E5P, 6S45P (which i've found a little better for my single-stage amp that 6E5P) and... perfectly god-like sounding (output beam tetrode) 6P6S!!! Triode-connected, for sure. Absolutely the MOST clear sounding driver, and...

Read the Post in new Window Read the Post in Threaded view  Post #4: Bias help by cb on 2007-10-09 
Browse the content of the threads in new Window  Thread: Bias help in Melquiades Amplifier  96 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #59: Bias confusion by op.9 on 2007-11-24 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
Romy,Could you help me understand your biasing scheme with this version? I thought I understood the original Milq circuit - but the only channel that looks like that to me is the D channel. I don't get A and B at all! what is the 50 ohm resistor doin...

Read the Post in new Window Read the Post in Threaded view  Post #221: Nice bias by martinshorn on 2017-10-01 
Browse the content of the threads in new Window  Thread: A listening room for a domesticated Cat? in Audio Discussions  283 Replies 
hi RomyNice bias battery gimmick for the el-caps!But, i see the hardcore analogue teams are having a hard time with room modes and time alignment :)I wonder what it takes to admit one day that you can’t neglect DSP anymore, and just having so much ea...

Read the Post in new Window Read the Post in Threaded view  Post #40: Full amp bias by Celsius on 2013-12-13 
Browse the content of the threads in new Window  Thread: The 6E5P tube data. in Melquiades Amplifier  44 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #41: Personal Bias by Paul S on 2010-06-21 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
Romy, in this situation, 70' of 8 ga. cable is effectively a variable reactive load and a sink. If nothing else, voltage drop will play a part here, 8 ga. notwithstanding. Whatever you use to span a gap like that will probably need to be biased to ke...

Read the Post in new Window Read the Post in Threaded view  Post #73: Milq Driver tube bias by KOTriode on 2012-03-17 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Romy,I looked at your Melq schematic : http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf  regarding the 6E5P bias. Would it be simpler to use two alkaline battery in place of R5 to provide 3V , or 3 Rechargeable for 3.6V in place of R5 ? Did you tr...

Read the Post in new Window Read the Post in Threaded view  Post #30: Gas Bias SRPP by lampes on 2016-11-24 
Browse the content of the threads in new Window  Thread: Melq 6e5p driver stage for ss? in Melquiades Amplifier  29 Replies 
Hi Shannon and thanks for the answerI guess i have to try it when i m able to build itRegardsTom...

Read the Post in new Window Read the Post in Threaded view  Post #10: Bias?!? DC?!? by Paul S on 2009-11-18 
Browse the content of the threads in new Window  Thread: Yamaha B-2 V-FET amplifier. in Audio Discussions  19 Replies 
Now we're talking!Romy, I have long nodded in agreement with your observations about the critical nature of "plate loading".  Meanwhile, my own recent experiments have shown that dialing in voltage and current is just as Big a Deal with SS as it is w...

Read the Post in new Window Read the Post in Threaded view  Post #155: Cycling bias: Improvement by jessie.dazzle on 2010-01-10 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
Romy, thanks, as usual, you seem to have been right.   The system is on and I just checked V2 voltage; its way off, above .4VDC, so I grabbed a hot pad from the kitchen and rocked the V2 tube. The socket made the familiar a dry creaking sound and see...

Read the Post in new Window Read the Post in Threaded view  Post #9: The history of the Milq's Bias, Part 2. by Romy the Cat on 2007-03-26 
Browse the content of the threads in new Window  Thread: A resistor between screen and grid in Melquiades Amplifier  9 Replies 
No, I did not try to use grid chokes.  The setting for Milq was flowing: the highest voltage in the gas tube and the highest value of resistor to the grid. Frankly there is a LOT of mystery how it all works out together and how it all inflicts s...

Read the Post in new Window Read the Post in Threaded view  Post #12: 6S45P zero bias by ml8 on 2007-04-25 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
[quote user="be"]ml8, could you tell what voltage and anode load you used the 6s45p without bias? What about grid stopper, etc.?[/quote]Kinda of 100-110 V on a plate. I didn't measure current cause by looking at curves i was confident that i'm not ov...

Read the Post in new Window Read the Post in Threaded view  Post #11: Bias by deemon on 2007-08-14 
Browse the content of the threads in new Window  Thread: The Melquiades bass channels: the coupling capacitor. in Melquiades Amplifier  11 Replies 
Hi all ! I thought about this resistor bias idea that Chris proposed , and found some some problems here . One of them discovered Chris himself - it is a big serial resistor in the grid chain , and it can cause not only HF rolloff ( it isn't a big pr...

Read the Post in new Window Read the Post in Threaded view  Post #18: 6E5P Bias by hagtech on 2008-02-20 
Browse the content of the threads in new Window  Thread: The 6E5P tube data. in Melquiades Amplifier  44 Replies 
I run the driver tube at 170V @20mA.  I don't think you need to run this tube at high current.  It is very linear with wide signal swings at this bias.  I can get roughly 70Vrms out of it.  Output stage clips first, driver continu...

Read the Post in new Window Read the Post in Threaded view  Post #20: Bias experiments by decoud on 2011-03-03 
Browse the content of the threads in new Window  Thread: Full range Melquiades implementation in Melquiades Amplifier  81 Replies 
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...
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