|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
Erik, I do not think a resistor in series would do as it will burn on itself some voltage and the coil will be driven by the same voltages. It would be good to put in place of the resistor a rheostat and to slide it up and down while slide up and dow...
|
|
[quote user="Welborne"] 1) There are hexagons on the schematics marked with A, B, C ...M. What are these? Are they testing points or they carry some meaning? I can't find much info about these here. [/quote] Yes, the hexagons are test points. Do ...
|
|
[quote user="Romy the Cat"] Celsius wrote:The problem is that my target is drive a 211 as full amp, and my CD player give a litle bit more than 1v to grid. What do you think 1V x 33times x 2.8 give 93ppV enought to drive the 211. Well, you nee...
|
|
Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving ...
|
|
[quote user="Romy the Cat"]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 very much non-definitive EAR 834P Modification Guide by Loesch Thorsten
Hi,Given that Romy already let the proverbial Cat out of the Bag (pun intended) I think I may have to make good here....
The EAR 834P is a very simple, but rather smartly ...
|
|
Hi,[quote user="morricab"]Hmmm....I guess I can't really see that unless you are enjoying a particular coloration you are getting from the TVC.[/quote] Nope. On this you are wrong. Based on direct bypass tests the TVC's I USE (that is the specif...
|
|
[quote user="cb"] The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adjust voltage to 0.0mvdc, I get a reading of plus 0.4vdc. This is with VR1 set at maximum (...
|
|
Thanks for the link, Romy.Very interesting.I need to run the numbers for 150 Hz, both high and low pass, 2nd order.Cement type resistor? Mills have gone to the dogs...Variable inductance OK (it might be handy...)?Have you tried s...
|
|
[quote user="be"]ml8, could you tell what voltage and anode load you used the 6s45p without bias? What about grid stopper, etc.?[/quote]Kinda of 100-110 V on a plate. I didn't measure current cause by looking at curves i was confident that i'm not ov...
|
|
I chanced upon an interesting PSU arrangement for my 5842. I run a valve regulated powersupply at 210v and then drop down to 160v with an un-bypassed 8uf oilcap. Any more capacitance or bypasses seemed to be a step backwards in terms of pleasure. A n...
|
|
No, I did not try to use grid chokes. The setting for Milq was flowing: the highest voltage in the gas tube and the highest value of resistor to the grid. Frankly there is a LOT of mystery how it all works out together and how it all inflicts s...
|
|
It's too late to be doing homework, but I seem to remember that mercury vapor tubes will handle serious voltage.Just put the resistor right on/under the pin.(damned collectors...)Best regards,Paul S...
|
|
What about a 3 position switch?1. Direct connection between the anode and the B+2. Connection trough a suitable resistor for a gentle turn on/off.3. Completely disconnected.Just remember to turn on and off the heaters at the right times in the on-off...
|
|
Alex, a cartridge loading has no “right” absolute value, it has of courses a certain fork of right values but to loading of a cartridge up to one of a few Ohms would be depended from many parameters, in some instanced unexpected. In my hands, used as...
|
|
[quote user="cb"] Yes, it is imposable to have + 0.4V on the grid, 0.0V at input, with R5 resistor in place and the gas tubes outputting +150V and -150V. My apologies, I meant to say I have minus 4.4v on the grid with the inputs shorted. Then I...
|
|
Romy Hi sorry to have wandered off topic, I am listening at the moment to an MSB Platinum Dac III, hoiping to get the lavry back for comparison, I believe the MSB is multi bit based on a ladder resistor , with 4 24 bit DAc modules,tremendous re...
|
|
[quote user="Chirag"]The 6E5P is an interesting device (I did some research after you dropped the "tetrode" hint and bought a few :-)), but the bias scheme with the OA2's is still incomprehensible to me. [/quote]Ok, I will try to explain.
The...
|
|
Ah, those figures seem more reasonable - 30pF seemed a bit low. Well, I'm not sure what you should be on the lookout for - as you say, it's a completely different animal to having a 3uF in line with the S2. What I would suggest, and this isn't ...
|
|
Grid leak bias is not reliable itself . Grid current is very low and grid resistor is very big , the circuit become very sensitive to all destabilizing factors - capacitor leak , humidity , temperature . And when we apply a big input signal to t...
|
|
that the high voltage coil will at the same flux have higher dissipation, this could mean that it will run at a higher temperature and thereby softening the mooving parts more.If this is the case and is benneficial, the resistor mentionned in the pos...
|
|
[quote user="Axel"]OK, this is useful also, in that you have not noted a "pattern" as you say. My point is closer to your suggestion, that I do change cart --- and sometimes buy new ones, B U T I do not buy other SUT (at least I try to avoid it). I'...
|
|
Ok, I have figured out why I have so extended bandwidth over 73kHz for my tweeter. I forgot that when I measured it I had the LPAD wide opened and in this configuration the parallel resistor is 20K and series is shorted. So, in that case I had just o...
|
|
I have no doubts that it will work but I would like to understand HOW it works.
The objective it to have first order filter, of cause not the filter where capacitance do high-pass roll off but RL. In RL filter there is not reactive elements i...
|
|
Romy if you feel that you are not loading the tubes enough put a 16ohm power resistor in parallel w the S2. this will cut the load line in half. It should be less wiry and stronger more weighty sound. Obviously you might experiment w values to find t...
|
|
It looks like he stripped off the outer jacket and the end caps and removed the pole posts, so he now has the cap equivalent of a "naked resistor", like the parts geeks drool over.I dunno, but looking at the naked cap, I wonder how firmly and evenly ...
|
|
[quote user="Romy the Cat"]
[/quote]OK, now, after mach thinking, consulting and very little actual listening I have finally conceptualized my next move with powering Macondo MF channel. Considering that I have some extra space Melquiades’ ...
|
|
Adrian, Romy, (Dima), First, I most certainly agree that the textbook operating point for the 2A3 is not optimal and can be improved on, hence my own design from a few years ago. If you are sticking with a 2.5K load, you will simply not ge...
|
|
If I say that it was horrible with San Audio 2A3 driven with buttery biased 6E5P then I really meant it. I got home today tune it on and it was so bad that decided that it shell not use it as is. Even though it an experimental amps but still it...
|
|
[quote user="Romy the Cat"] I think I need to put a switch that would disconnect the right and left primary in case the Mono SPU is used. I ‘m still thinking about a more elegant solution…. [/quote]
Well, it is resoled and it is resoled remarkably s...
|
|
|
|
|
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: |
42,883,505 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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- »
|
|
|
|
|
|
|