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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Thanks again, Romy. I never would have guessed that the relay-like pulse comes from a dying output tube rather than a fault with the relay itself; but that does make it lots easier to deal with!As you know, meaningful info about this amp is har...
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Dear Romy,Thanks for the information that the sinewave form is only generated when the battery power takes over. The pdf is a good article. I did more research today and located a schematic which backs up what you have said despite t...
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[quote user="anthony"]Do you still use
the fuse shown in the MF channel schematic linked above (not the 6 Channel
schematic)? [/quote]
This find that this fast blow 100mA in B+ supply
of output channel is a good idea regardless. In a minor way...
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[quote user="Romy the Cat"]Anthony, I think you take the right this in a wrong way.
Sure the quality of the coupling caps is important but you truly shall not be worry
about it. Make the amp, get comfortable with it and then change the damn cap.
I...
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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...
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[quote user="anthony"]Do you have a
“final version” of the schematic anywhere? [/quote] I think that the one you
have might be recognized as final. The Rev2 was without DHT in MF and Rev3 was
with it. I did not do anything else with the amp af...
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[quote user="Romy the Cat"]
el`Ol wrote:I think they could could make the sound more pleasant with an overkill of second harmonic distortion. But for people who prefer that kind of sound a relax-horn like Anima would be better anyway. No real solut...
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N-set, actually, I have seen a stacked-L schematic like you posted, with stacked caps layered over and R at earth for the tank, and I am on record as saying it is very elegant. So, sorry to be such a skeptic, but I learned a long time ago that the o...
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[quote user="N-set"]This is EXACTLY the bullshit I wanted to avoid and never touch...hermetical circles...special orders...dick sucking....fuck off!As I understand you are not able to comment on the switch nor on its performance in your radar?It is a...
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Hi Romy,I read about EAR834p modifications in number of forums. And I never found any explanation how does RIAA feedback work.Only from you I heard about Miller capacity that used in this RIAA.I tried to do my calculations and as I understand the Mil...
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I'm working on a project that may be of interest to others, and thought posting to this old thread was a better way than beginning a new post.I use speaker level passive crossovers, between multi-amps (not DSET) and drivers. My desire is to move the...
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I finally added a -15 dB voltage divider to my ML2s last week to fix the noise problem from my L1 preamp - Why did I wait so long?!!The result is absolute dead silence. Nothing. Nada. It is almost impossible to tell if the system is powered on, ev...
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Hi Romy,I am designing the power supply chassis for the DSET at the moment and hope that you can remember some things about how you managed the grounding.All power supply components up to but not including the filter caps for each power supply will b...
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Hi Romy,What a busy year just gone! Finding enough time to just sit down and get the DSET's going has been impossible, but I have time now and have started the process.At the moment I am introducing some high voltage to the first amplifier chassis, ...
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After planning out the exit strategy for my DSP crossover, I am resuming my first Single Ended Pentode 307a tube amp project, the one mentioned earlier. I'd like to approach this with a certain degree of understanding so I have re-read carefully all ...
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[quote user="KOTriode"]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 ...
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[quote user="decoud"]Yes, it is built according to the schematic, but by someone else, from whom I have only just received it. The opt is custom-made nanocrystalline amorphous core, gapped at 300mA and running 200V/240mA. [/quote]Very good. The 200V/...
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[quote user="Romy the Cat"]
[/quote] I received a link with description how the YO186 tube that drives my MF was used by Russians. In 30s and 40s it was used in portable film projectors PU-12 and PU-13. Below is the schematic of the PU-13 low frequ...
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[quote user="Romy the Cat"]Why do you think I bout a 1000 of them and closed to the rest of my life my interest in driver tubes?Still, the 6E5P should not be measured as a driver but heard as a driver – the beauty in this tube is in its sound.I do no...
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[quote user="guy sergeant"]I used to work for a valve amp making company and we had a little 2 stage phono amp that sounded far better than the 834 with passive eq, no feedback etc. It also cost less than the EAR.I can send you the schematic if you w...
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Dear AllI am new here, but have been reading quite a bit about the EAR834P from people here who are quite enthusiastic about this design.Thorsten had got me off my butt to build a EAR834P from scratch when he posted his mods at the AA. I still o...
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Hi, Tomand
Anything BiDAT would likely be known by, also the express purview of, John Wright, in Canada. He is friendly and accommodating, but this is his livelihood, after all. Why do you need the schematic so badly?Best regards,Pau...
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Measet,Thank you very much for posting this extremely valuable information! It adds to the data base for the 5000. I will have to translate it to English using the Google translator. Now, if someone could locate and post the RY-5500 schematic, we’d a...
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[quote user="floobydust"] Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Yo...
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So, my two problems have been fixed, I think.First was the issue with the 6e6p for the HF Channel not being able to draw enough current. I checked the bias and it was fine and the potentiometer allowed plenty of adjustment so I changed nothing in t...
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Domidaw seems to be saying he has only one channel almost working, this one with the burning resistor. I don't think he said he has one (other) channel working correctly. If he is really dropping 240 - 196 = 44V across 50 ohms, then he has 44/50 = 0....
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[quote user="KOTriode"]Ok, I just read your "Melquides Remote biasing". This technic can not be duplicate in my amp due to DC coupling, the C3G (I dont use 6E5P) driver stage basically adjust the 6C33C current in the output stage. Just for curiosity,...
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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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I'm thinking about trying to put together a Melquiades amplifier for myself. I printed out a copy of the schematic (thanks for sharing). I have a simple early question. Both the 12.6 and 6.3V windings for the filaments are shown as being center taped...
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Hi
I’m planning to build the Melquiades. Owning something that is better then a Lamm is definitely something for me.
Having 220V 50Hz. What changes are necessary in schematic?
Bigger PSU caps, inductors?...
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