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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I kind of disagree with Adrian. The wire, the coupling caps, the cathode resistors and many other things are superbly important but it is after the strategic topology is settled. In my view caps, resistor, wire and other things are responsible for th...
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I am taking about coupling capacitor between driver tube and the DHT. There are zillion way to do it and no one said that they need to be used. No one proved yet that a very good quality of caps shell be worse than other methods. In my case since the...
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Thanks, Romy, for your generous reply.
I won't try to address everything about everything, but let me bore
you with a mini-history of what is going on with my playback so you
will understand where I'm coming from and where I'm trying to ...
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I think it is about right. The 6C33C for upper base has 100K
biasing resistor and 20K to ground in Lpad. That would make ~60Hz. This high
pass that unload the LF from the horns that it can’t handle is very important
as you do not want driver to pr...
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[quote
user="anthony"]Sorry Romy, I was not clear enough, but the resistor
that I am questioning is in the Fundamentals Channel (not the MF Channel as I
believe you referred to in your previous post) between the OPT and the
S2.[/quote]
Ah, th...
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Post #88:
Great!
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by
G
on
2018-04-13
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Thanks Romy.
Ok. I have installed a 30k resistor on the input and it reduced the drifting when the preamp is not connected. If my preamp is connected then I do not get any drifting at all and input voltage stays at 0v when I switch the...
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Today, I decided to measure input voltages that induce clipping in my operational DSET. I basically just put in place the appropriate load resistor, set the signal generator at a level in the middle of the bandpass and increased voltage until the si...
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[quote user="floobydust"] One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit opera...
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[quote user="Romy the Cat"]Hm, interesting, I did drop the crossover frequency but I do not like the result. I was driven in different configurations and experimented from the current 13kHz to 7.5kHz. As soon I drop below ~ 11.8kHz then the overl...
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[quote user="Romy the Cat"]OK, here are some follow up thoughts after the completion of the project. I am sure I will burn it for a month or so. I think everything will be fine, I do not expect any issuers technical or sonic. The way how the entrance...
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[quote user="hagtech"]First, it seems like the tubes are starved. They are running very low current. The 12AX7 is also at low voltage. I'm guessing they are running at about 0.3mA at 65V plate. This operating point is way down...
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Nope it is not my birthday today, I share this day with Mahler but I truly celebrated my birthday yesterday. Yesterday I got home and found in my mail box a package from my Japanese friend. I brought it home, I knew what it was, I put it on my ta...
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[quote user="AnonymousUser"]hi-i have downloaded the circuit diagram for your amp but wondered if you have any photos of the "guts" so i can see how you laid yours out ? [/quote]
I do not have a full rage Milq anymore. I have only the 3-chanals Supe...
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Paul,
Thanks for pitching the Johnson capacitors. They do not look “large enough” for me. I used in past the following caps:
http://www.oselectronics.com/ose_p96.htm
They have very good size to value ratio. The ironic part that I just called to th...
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[quote user="drdna"] Not that the sound is bad, but my technique must be bad. Because sometimes during the day the sound will get really particularly bad, even to the point that it sounds like clouds are passing by over the music, if you unders...
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[quote user="Romy the Cat"]Anthony,
First, your measurements again the “appropriate load resistor” has very little practical meaning. The
drivers is a dynamic system that has impedance not resistance and the impedance
varies with frequency. So...
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It was yesterday around 4 PM – I viciously took it off and decided never use it again. I was listening Brahms German Requiem with James Levine and BSO – a phenomenal performances in my view and one moment after being offended by each note the F...
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Generally the 105V gas
tube are the best and the most stable gas tubes and if you are willing to use
them then it would be a good idea. You need to recirculate the whole bias
securely to do so and it is tricky. It is not so hard to figure out how ...
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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="N-set"]…in particular TU-X1 tuner needs quite some
amplification….
[/quote]It is not necessary the
case. My TU-X1 has nigh output, no different than all of my other front ends.
If you look at the schematics of the TU-X1 then you mig...
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[quote user="CO"] I dont need flat to 20K but dropping after 10K necesetates a tweeter. [/quote]
And there is nothing wrong with it. No one 500Hz driver that said is doing to 20K in reality does it. In fact if a driver goes to 20K then the place for...
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[quote user="Wojtek"]has supposedly very nice Obbligato line of film HV caps . [/quote]
Thanks, the high nominals the have only 630V and they are larger than I would like to have. Does anyone know how those Obbligato sound in PS?
[quote user="hagte...
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[quote user="Paul S"] Romy, on Fundamentals channel did you leave the 20uF cap at speaker level or did you re-configure that band pass at line level? [/quote]
Nope, it is hoe it depicted the 20uF cap at speaker level. I see no problems with ...
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It is amassing what kind of tricks the Fundamentals Channel allows to play. Since my high-frequency Vitavox S2 driver “clicked” recently:
http://www.goodsoundclub.com/TreeItem.aspx?PostID=3592
my “Fundamental Channel” with my LF Vitavox S2 al...
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How lucky I am! The Melquiades bass channel at full throttle gives me just enough gain to power my Midbass horn to the reference level of my MF channels. That is truly a very lucky thing. The biggest dilemma I am thinking now is type of the filt...
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I know – it idiotic even for my site but it us what it is. I do not think that I can generalize my observations as I have not a lot of experience with DHT tubes but one thing that I have been observing for the last week is really arouse my curios...
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[quote user="floobydust"] The final ratings on later ST-style glass 45s was 10 watts on the plate and 300 volts cathode to plate max. Recommended bias current is between 34-36ma max. Short answer... I prefer no more than 34ma on the 45 cathode. I...
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[quote user="drdna"]After seeing the variation in the sound of the TU-X1 to the quality of electricity, and thinking about recent discussions about the Direct Heated Triode, I would like to start a compendium of anecdotal observations of the idiosync...
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[quote user="Romy the Cat"][quote user="drdna"]I would like to start a compendium of anecdotal observations of the idiosyncratic nature of COMPONENT PLACEMENTS in the circuit. [/quote]Surely all passive components in the circuit have influence, but I...
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Hi,[quote user="Romy the Cat"]This subject of digital crossovers became quite popular during last few years and many audio-people give up and go for a simplicity and painlessness of digital crossovering.[/quote]Well, digital X-Overs would appear to o...
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