|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
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...
|
|
I sympathize with those who were caught up in the financial problems that pure power had when one of their salesmen went rogue and attempted to steal their product, which lead to a long court fight which they won. Obviously this didn't help th...
|
|
[quote user="deemon"]Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides ... [/quote] Actually it would be a serial coil, as I need a low pass no...
|
|
[quote user="Paul S"]It surprises me if you wish to do away with the battery. Or, perhaps a unit could be offered "less battery", which the purchaser/user could add on his/her own. This would "solve" the logistical problems (and the expense) of shchl...
|
|
OK, I have conceptualized what I need for the tweeter amp. It will be MilqEZ – the same Milq one with 6C19P at output. I will use the Super Melquiades power supplies but the HF channels will host own last caps of the filters and own bias of the both ...
|
|
Yes, I understand that APS' mantra is, "no differences between battery and wall power source operation". So, there is irony in the fact that so many users report improved operation when they unplug the unit from the wall, if only to finally silence t...
|
|
Well, what I told you that I am a Moron and you did not believe me then you were fools. Here is a case to point. This week I deeded to connect my Holrick mechanical motor-generator in use. I did not mean to listen the sound of it. My objectives were ...
|
|
I am getting a dedicated third amp to drive my upper bass channel and I just figured out that when I go with my midrange channel at the line level passive filter then I would need 0.0000302uF capacitor against the amp's input stage, that means… 30pF…...
|
|
Hi Saturntube, 40 Hz - 200Hz = wooo, woo, wo, - hm... Forgive me as I'm not talking about horns right now, but some sort of 4th order *acoustic* roll-off at 200Hz may apply with a horn as it would, e.g. with a second order cross-over in a box-spe...
|
|
[quote user="noviygera"]I have been thinking about how nice it would be to have have a good sounding DSP for crossover and delay functionality. I know this subject was covered here before but what was talked about is this DSP is not that good, and th...
|
|
Here is a good material with Chinese capacitor shootout
http://www.goodsoundclub.com/PDF/capacitorshootout.pdf
It looks like more or less intelligent writing, thought the caps sitting between stage and caps sitting in feedback work differently (con...
|
|
Romy, Now you mention the issues here, I am thinking about what the differences in quality might be due to. I notice that you haven't explicitly said which is better, super or regular... so think of this just as brainstorming as to why things are... ...
|
|
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...
|
|
The differences between the battery operation and AC operation are to be expected.One case is isolated (hopefully) from AC, the other case is not. If anybody thinks otherwise,they are fooling themselves.The first question to ask is to MAKE SURE that ...
|
|
The weak bass of low-power SET amps is well known. I don't think anyone would disagree.Some reasons:Simple low power, especially with 93db speakers (try with 106db like Yorkville LS1208 horn subwoofer it might be different).SE output transformers hav...
|
|
Remind you that in properly operating PP it shall not be negligible difference if the unit run from battery or from wall outlet. Sine I do not know why PP sound as good as it is (when it works properly) I can only speculate what the presenc...
|
|
Adrian, Fair enough... it's not about power or gain in your case, just making it sound as clean as possible. Well, if you go back to my earlier post on findings, I list the basic operating values. Just to recap them here:Plate supply ...
|
|
***The proper loading value is difficult to say without knowing your system, as it is partly a preamp and ultrasonic RF issue as well as one that involves the cartridge and audible frequencies. Some cartridges have frequency abberations within ...
|
|
Hello, 29-year-old, audio enthusiasts. I'm still alive and
although I am struggling to manage my life between three small kids and a lot
of heavy work, I still man you told my site attentively. I will be happy to
collaborate with you on anythi...
|
|
[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 ...
|
|
Yes, it is an interesting idea. There are a few uncrown points
in there. The lithium iron phosphate are fine as a storage but how they impact sound?
If you look at the experience of the people who use batteries for grid biasing
then you will s...
|
|
Here is another advantage of multisampling and DSET in particularly. There are many moments in amp that in one or another degree affects transients.The capacitive coupling for instance works fine but as long the amp sits in class A1. As soon amp hit ...
|
|
The life with FM is great – did not play record for a month or so… I was playing with some other tuners that came across Kenwood L-02T and Mono Scott 310. Both were no good.
Anyhow, the experimental Sansui was running all that time. The “tone” at HF...
|
|
What an incredibly cool result!!! I retrofitted the Rohde & Schwarz decoder with a few changes and it throw a very very very nice sound, in fact even better then I predicated. The Decoder has a SS single-end out stage (not PP) with a high-heated ...
|
|
The failure Herman had was probably on the input side - not the output. You will notice 2 things. 1. The system operated normally for 6 months, so it is unlikely an overload issue.2. The PurePower did its job of protecting the audio equipment (self s...
|
|
[quote user="diz1"] Are the First reflection points for horns speakers are different from other type of speakers? [/quote]Yes, the sound from horns does not propagate straight along with the line of sight but it curves according to the Xchyler eq...
|
|
Romy, I'm of course familar with your MF design and Jim's 6E5P curves is what I base my considerations on at this moment (along with the corresponding Spice model).Your DHT MF is quite self-balancing due to the large cathode resistor. WhatI have in m...
|
|
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 regulators. It mi...
|
|
I see, let me to explain how the this work all together the you will be able to make your own judgement. Let look at the functional purpose of the emails in there. The R1 resistor is a loading resistor. This is understandable. It makes sense to kee...
|
|
Hello Romy
Looks like you may be about to set us off salvaging smoke alarms (like that boy scout a few years back) ;o)
An idea that I haven't seen explored yet for low level stages is the use of Peltier Effect heat pumps to cool the valves. As ...
|
|
|
|
|
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: |
42,785,549 |
|
|
|
|
|
|