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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="Romy the Cat"] anthony wrote: The fuse. You show a
fuse on this schematic (that traces back to the B+ supply) but omit it on the 6-Channel
schematic that I linked to earlier in the thread. Do you use this fuse or
have you removed i...
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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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David, there are no different Melquides versions. Melquides is all about to use two-stage solution around cathode-ground 5E6P/6E6P with grid resistor bias where the bias voltage buffered by gas tubes. You can creates countless versions around th...
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Do you know what I did for the last 4 hours? I was soldering one freaking cathode resistor for Milq DSET and was trying to figure out why the voltage does not drop on it. Do you know what the problem was in the end? The problem was that I just fo...
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[quote user="op.9"]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...
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[quote user="Paul S"]Romy, I am not clear why you would worry about DC if you can set the RC where you want it and mute input. Biggest problem, of course, is HF, since it takes bugger all to blow those ribbons. But I thought you had that ...
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Today I was reading Jim Hagerman's interview about his Trumpet phonostage and learn that he uses LCLCRCRC filters for B+ in his design. I certainly do not question Jim’s decision; in fact I never heard this phonostage, but I would like to comment, co...
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Paul I slightly surprised about your comments. The regulating aerial amplifier tube affected sound very mildly, if ever, at least it was my experience. I had a few different 6AK5 but changing them was not a highly notable effect. I still have left a ...
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This became really insulting: the FM broadcasts from a consumer quality radio delivery in my listening room the level of audio quality at absolutely unmatched level.
I’m not kidding. The Sansui TU-X1 that I use is a consumer machine made without any...
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Well, it seems no matter how hard I try, I am never able to get anyone to think outside the box here. Sort of frustrating.[quote user="Romy the Cat"]For instance the gold plated metal film Holco resistors a few year back were very good and then the q...
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Is 88mV.
I also noticed that resistor R2 is also very hot ...
Can bridge rectifiers have any influence on all of this?
...
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After eons of construction, I've finally completed my version of the 801A premap, based on Ale Moglia /Bartola Valves design with his Gyrator anode loads, SiC bias and Rod Coleman filament supplies. 6 inputs, switched by an Elma switch and Dave S...
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Here is a snippet from an email from Jonathan Carr (Lyra cartridge designer) about objectives and considerations regarding cartridge loading. Most of this is old news, I only re-post it here as a convenient synopsis on this most misunderstood t...
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Hi,I am slowly building my own Macondo. I understand why the injection channel is there. It brings some kind of softness that the compression drivers lack. I am using a 12" JBL midbass driver (~100dB sensitivity) in a 50L single driver Marshall cabin...
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I made further experiments and listening and now I have concluded that I am very comfortable Yamaha T-85 Multiplex decoder and I have sold it to use it as a default multiplex for Rohde & Schwarz EU-6201. I made a few modifications in T-85 Multipl...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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I actually woke up today at 6AM, check all settings on my arms (after a few month of not working), demagnetized the needles and was spinning records all mooring. One of the benefits that I got with new phonostage is that the grounding patters for all...
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[quote user="Romy the Cat"]I did not measure the distortions… [/quote]I had a conversation with the APS guys. They clime that their units do not act like my unit and that no one of their previous customers informed them that their units at a fe...
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Yes, Chris, thanks.
I understand how it works, the same Newton Bias only on the other side of the driver’s tube. Dima have proposed something similar in past and last nigh we discussed with him what you suggested. He was planning to post his commen...
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Well, I spent today a number of hours trying to advance my observations regarding abilities of the one-stage Melquiades. It was quite interesting. Thankfully the electivity today was way better during the second part of day. I loaded the 6E6P heavier...
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[quote user="anthony"]I plan to
build a fullrange Melquiades for a friend and then if that works out the DSET 6
or 7 channel version for myself. [/quote]
That is very good approach in my view. The
problem is in this approach that you have t...
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[quote user="Brian Clark"] I have some ZVN0545A mosfets here for exactly that purpose of replacing cathode followers. You may like to try this starting at 2mA (250V supply, 125k biasing resistor). [/quote]
Brian, and how do you find your MOSFET beha...
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Ok, you are getting somewhere. I am not sure why I used the 100R, 50R and 22R resistors. It is good idea in some cased to list the potential of some circuits but it need to be used ONLY what it necessary. Do not forget that in your case you have 5 ch...
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Well, it is not necessary a fully qualified urban legend as the problem does take please with fixed based 6C33C but..... only under certain conditions. I have written about it a lot on my site but will very briefly recall it again.
Dima might be cor...
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[quote user="drdna"] Well, and I have a dozen of them sitting here next to my desk while I am building my Milq amp s-l-o-w-l-y so I guess I will discover my audio intelligence level sometime after the New Year.[/quote]
That is so cool that you...
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I spent some time with my back chamber, trying to drive the driver resonance heighted. I built a sealed sarcophagus as a back chamber (if somebody are interested I can post a picture) approximately 1.5 gallons but it moved Fs for 700Hz. Then I began...
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T, although I am not in disagreement with what you suggest but I have to admit that your expectation of user applications dose not make sense to me. I’m taking the use of a transformer in a system and getting a result out of it instead of building a ...
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Laurent,
The V2 in 6C33C does NOT need to be matched by other characteristic then gain and it is very easy to do. If you have two V2 tubes and they have different entry points for bias but the same gains then you will not detect any sonic cons...
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Domidaw, you wrote: The photo shows the capacitor c10. Its minus is connected to ground, its plus goes to the output transformer,According to the schematic it is the grounded (minus) end of C10 that should connect to one side of the output transforme...
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