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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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Hi Jarek,Apologies for missing your post.To answer your questions:(1) Yes and no. I've bundled the preamp into its new chassis (that I made from scratch) and it does not sound as good as before. There is a grounding problem with the new installatio...
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The sockets for 6c33 should be here in a few days. Meanwhile, I fired up the 6ep5s. I labeled them ABC. The B sample ('83) with gold wire has a short or something. The other two look fine A ('63) has a little more output than ...
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[quote]do two tubes at once then it make sense to have one selected reference tube[/quote]I see. Yes, the digital scope option would work. I have one, might try it out. With a 6c33, the VacuTrace has only enough power to trace ...
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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...
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Jim, It is the super tube – you forgot to mention the amount of noise with its transconductance…. You use the 7788 as a driver to drive 2A3? This is kind of strange: the 7788 has relatively low bias and a typical line voltage should sent 7788 deep in...
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Hi Paul,My question was of cause about my phonostage based on EAR834p and "End Of Live" modification with air capacitors and LCLC + 0A2 power supply.A couple weeks before I increase the second stage ECC83 cathode capacitor value to 43400uF (Kaisei no...
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[quote user="Romy the Cat"]3) There is a mistake in Milq circuit. The B+ of the driver stage has almost insufficient amount of critical inductance. It was because I drew the circuit having the Super Milq in my head where the PS was feeding 3 stages a...
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I double checked and everything seems connected ok. all parts values are correct. I have measured the voltage across R2 and it was 208V so 208v / 15k = 13.86mA. I connected 1r resistor between M and R2 and it was 14mA. also connected 1r resistor betw...
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[quote user="Romy the Cat"]I think it takes around 60 seconds on my amps. I have 2 minutes delay for high voltage, so it all within the limit. [/quote]
That is good to know Romy. It was quite frustrating when I tho...
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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...
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Dear Romy,
I have been reading the threads on GoodSoundClub about your journey with development of the Melquiades and Super Melquiades amplifiers. They are very interesting to me. I am pleased that your purpose was to produce a particula...
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[quote user="ml8"] If you think gas regulators make sound of 6E5P so nice, didn't you try putting gas regulator tube in the grid of the 6C33C, and why? [/quote]
Sure, I trued. It sounded very bad. I pull out of my butt any imaginable rational with e...
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A year or so ago I published the evolution of building my full range Melquiades amplifier:
http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=2502
Now, I am staring a thread where I will cover the progress of building Dima’s “Zarathustra II” ...
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[quote user="Johann"]Hi Romy,i want to use the 6E6P-DR (triode mode) as driver in my tube 45 amp.I use a D3A (triode mode) with Anode choke at 180V, 12mA. Grid 2 is connected via 50 Ohm resistor to anode. Grid 3 (pin 8) is connected to cathode.Th...
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Well to pile up superfluous things into audio components in order to make products more expensive is not alien thing in audio. My question was not about to mock the Raven company. It might be fine TT, I do not know anything about them and I do not p...
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[quote user="Paul S"]Aparently, a few people complained back to Ken Chait that his "carefully-matched" (with an adaptor on his Amplitrex AT-1000 machine, i presume) pairs either weren't matched to begin with, or they did not stay matched. Anyway...
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[quote user="floobydust"][The Moondog amplifier has] a higher B+ voltage (350 volts) with a 1K cathode bias resistor and the 2.5K load.[/quote]
[quote user="Romy the Cat"]...the most proper operation of this tube will be at 275V on plate and 4.1K ...
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I do not know why people go into low-sensitive loudspeaker and they go crazy in order push the last drop out of the class A2 operation. From a different perspective the Macondo’s woofer towers with 97.5dB sensitivity are low low-sensitive loudspeaker...
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Vincin, thank you for appreciation of my work. A few comments and thoughts about the
direction you went.
I do think that to compare 300B with your version of Milq is
not proper way to demonstrate or to learn anything about sound, particularly
...
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The 6sn7 is a fine amplification tube for use in preamps or gain stages, but it has way too high of an output impedance for driving power tubes. This is my personal preference. It also depends greatly on the topology. Maybe George u...
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Who know how they die, at least I was not able to figure it out. The literature suggest that when gas regulator at the end of their life they stop regulate or maintain regulation but increase noise. I was not able to detect it.
I have many gas regu...
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[quote user="Romy the Cat"]Yes, you are right, the voltage divider from 6.3V across 47K and 10K resistors shall give not 0.9V but 1.1V. However, the numbers that are in circuit are not something that I saw in my dreams but the actual numbers that I m...
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scooter,Interesting that you attribute the effect to amplification, not to the loudspeakers. You might be right, I do not know – I do not have a lot of experience with getting right sound from SS amps and for me is a big mystery how they work. The B2...
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[quote user="hoan da ox"]Hello to all, After following the comments of Romy for some time (have learned a lot, thank you), I would like to ask a question on this subject.This circuit is built with resistors, diodes and capacitors. Could someone elabo...
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[quote user="Hyperborean"]Am I going nuts or all these posts around digital recording just crazy? Digital is not even near that point to consider it as a recording medium, specially at home. There is only one way to do it right - analog! Seems like y...
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Scott, Do not pay any attention to the moron advice given on the Audio Asylum. The issue is not with the quantity of the power you have, it is with the quality of power you have. Genn makes some very good points. Most circuits...
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My DSET amplifiers are starting to go together (slowly).Bias string and bleeder relays/resistors...The remainder of the filter caps. The middle floor goes on and the filter cap for the First Stages (6E5P/6E6P).Then the OPT's go in place and the shel...
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Hi Romy,I am very interested in what you have found out about the 6C33C tube lifetime because I am using a pair of Silvaweld OTL tube reference (their name for them not mine) amps that use 4 x 6C33C-b tubes per monoblock (so a total of 8). Thes...
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the cynical whores whom don't believe in what they doing from the ones which do. Joe Roberts happens to always have expressed his W.E love and bias ever since the dawn of "Sound Practices" so I don't see his involvement in Silbatone as a "whorish sel...
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