|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
[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...
|
|
[quote user="drdna"] However, there is something to be said for the certain magic that can sometimes happen with a particular device. The unpredictable transients and color shades add a sense of alive-ness that seems separate from the standard charac...
|
|
This thread has been pretty interesting overall. I've read most of it and would at least like to provide some feedback on the technical side of designing with the 45 and 2A3 DHTs... at least from my personal experience. A few years back I decid...
|
|
The greatest thing that happened to my Yamaha B2 amp was the fact that I got rid of my MiniMe ported bass section. The MiniMe is truly nice now and I operate in the highly desirable not annoying status. That all made me to pay more attention to w...
|
|
First off, I forgot to mention an interesting observation: Before running the sweeps (previous post), since the drivers in the upper-bass horns are new, I decided to verify/optimize rear chamber volume (they are easily adjustable)... I wasn't expecti...
|
|
Romy wrote :
"...You have too much gain in your playback for 109dB sensitivity... I used ML2 with 109dB sensitively and L2 with 12.5dB voltage divider at ML2 and I had no annoying noise at nearfiled..."
Ok so I made a couple voltage dividers fo...
|
|
[quote user="genesis168"]I am a owner of an ET SU-1 and would like to know what phono stage would go best with it. Would a Lamm LP2 be a good match?Will be using a Dynavector XV1s with it. Thanks in advance[/quote]It is truly an interesting question....
|
|
[quote user="hagtech"] 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. [/quote]
Good operation points for use it as a driver. You might...
|
|
Sine I informed public about Melquiades amplifiers I receive many emails from people asking me about the operation points of 6C33C. For whatever reasons people mistakably took me for some kind of 6C33C guru, which is am not. Moreover I could be hardl...
|
|
[quote user="k100"] If I were to try to find a pair of ML2's that are older production, what years of production does this include? [/quote]
All ML2.1 are the new version of ML2 and they are not good as ML2. However, I have seen the original ML2 mar...
|
|
There are many ways to deal with EAR-843PT. To my ears it works wonderfully, this in my case it coupled with Expressive Technologies ET2 transformer that probably takes in totally new league. I kind of so addicted to this transformer that I even run ...
|
|
It is nice to see you around, Jim.
A few comments. C1 in my phonostage is .28uF. The higher values were a proposal of Anagnostopoulos. I understand what he is coming form and yes my output stage of power amps will be able to handle the ULF stress. I...
|
|
I do not know how about 5dB attenuation
via cable but for sure cables sound very different. Hey you are talking to a person
who have a small fortune spent for wiring my entire system with vintage Dominos
and I never felt that it was waste of money...
|
|
[quote user="Romy the Cat"]I think to conduct any more or less methodologically cleaner experiment the best would be to have the field coil with multiple taps. Make the coil standard 600V rated and to design the coil to have let say 4 taps that ident...
|
|
In the TAS that I bought because the Lamm ML3/LL1 review I found Jim Smith add about a new Engström & Engström Lars amp from Sweden. Jim tells the story about the Engströms and about the 20 Lars’s rules that reportedly assure “good sound”. Th...
|
|
Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have...
|
|
[quote user="KOTriode"] Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the reg...
|
|
[quote user="Romy the Cat"] It did not last long….
Just a couple days back I was thinking that I will live with my current lower bass for a while and now I feel that I will not. I do not feel that my current ULF is wrong. In fact I feel that ...
|
|
[quote user="Romy the Cat"] There is no aspects of minimization
of the inductor size. You can go to 30K, or 50K, or 100K input LPAD. The LPAD (which
is not inductive switched attenuators with good resistors) anyhow sites behind
the filter, so the ...
|
|
[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...
|
|
Gintaras, yes, the 10.5mA was a bit too little for gas
tube, 21mA. If you look at the stability of voltage regulation graph for these
tubes then you will see an ark with 15-20ma being atop.
I do not understand why you keep asking me R13
& R...
|
|
You decided to go with mA or are they mV against 1R resistors?
I prefer the second approach personally and I feel that I can moderate the quality
of resistor and I can’t moderate the quality of the milliampere meter coil.
The whole thing looks l...
|
|
Gintaras, basically it is not bias voltage
problem but voltage drifting +-10mV with preamp disconnected. The 10mV is absolutely
irrelevant voltage. You see, the gas tubes are voltage stabilizers but they are
not as precise as the SS stabilizers. T...
|
|
Gera,
tuning the amp loading is a tricky part. If you deal tube that you do not know
and the driver that you do not know then there is no way for you to know the
entry point into the game. I think the best way in this situation is not use
what pe...
|
|
To answer the question WRT reliability.
I have built wholly switched mode amps with 2A3, 300B and now a 45.
I
also have a DAC 44...
|
|
[quote user="anthony"]
One question that I still have regarding the
L-Pad on the MF Channel is why you did not lose more gain at the filter before
the MF driver stage? By my reckoning a resistor change here would shunt
more signal and you would ...
|
|
[quote user="anthony"]Romy, I
appreciate that this is an old thread now and that you may not remember
everything from your time developing these amplifiers, but I have a (hopefully)
simple question about the upperbass crossover in the schematic ab...
|
|
The only issues that I have ever had were putting the piano in a place where the large smooth surfaces did not cause assymmetric reflections that messed with the stereo presentation.
The damper pedal on a piano is "on" when not d...
|
|
Darren, I understand what you say. I would like your confession
about acoustic system with any comment as this is amp thread and I would like
to be on more or less on the subject of the thread.
I do not know the 285GMF driver but it is ...
|
|
[quote user="KOTriode"] With 6C33C output run at 40W plate dissipation, this amp run much hotter than an 845 amp with output tube running at 100W. I measured the hottest point on the bulb and it is about 380F. I guess the due to short bottle , t...
|
|
|
|
|
All context of this site except the Forum's posts
Copyright © Roman Bessnow 2004-2024
All messages within the Site’s Forum Copyright © by
authors of the posts
|
|
Last 24-hours posts: |
0 |
|
 |
|
|
Total human visitors: |
42,886,913 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Froberger, Johann Jacob (1»
|
|
Graun, Karl Heinrich (7 Ma»
|
|
Nardini, Pietro (12 April »
|
|
Piccinni, Nicoló (16 »
|
|
Kozeluh, Leopold (26 June »
|
|
Salieri, Antonio (18 Augus»
|
|
Burgmüller, Norbert (»
|
|
Brahms, Johannes (7 May 18»
|
|
Tchaikovsky, Pyotr Ilyich »
|
|
Poot, Marcel (7 May 1901-1»
|
|
Paap, Wouter (7 May 1908-7»
|
|
Raynor, John (5 June 1909-»
|
|
Montsalvatge, Xavier (11 M»
|
|
Cardew, Cornelius (7 May 1»
|
|
Slavický, Milan (7 »
|
|
Vaarala, Jussi (7 May 1954»
|
|
Mayo, Kevin (7 May 1964- »
|
|
|
|
|
|
|