|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
[quote user="N-set"] I do have some serious concerns with respect to my design, the LF stability beeing the most important one (before we even approach talking about the Sound...if any); you may rememebr I was asking you about the stability and relia...
|
|
[quote user="cv"]Here's a crazy thought... have you every tried driving the S2 directly from the Placette?! I know the 6E5p does some unique things but I wonder if it might be educational.The placette has a 7 ohm Zout right? Don't forget that that do...
|
|
Paul, 6E5P may strech very much, but maybe just enough to close the gap. In such a racing car there is a little margin, it's not a usual 10W+ design. Biased at -3.5V 6E5P will produce +40Vmax on the grid, driver driven to the limitThe grid will eat ...
|
|
peter wrote: By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF response, or a tu...
|
|
[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 (...
|
|
The maximum power I can get as now from the single-stage Milq is at 3.4V, not at 3.0 and it is still well under one watt. I think I would need a little more to get some pick power. I need to play a little more with 6E5P’s operation point to find it’s...
|
|
Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
|
|
Paul, I know NOTHING about pentodes. I looked at the curves:at 1500V/300mA/-85V loaded with 3.2k will give a whooping 190Wwith +/-85Vmax swing, staying in A1. At 2.4k this drops to 155W.G2 @500V, eating 50mA of current(!)But the linearity...???? The ...
|
|
Now I re-listen all the things the we try to measure. To surmised everything I have to tell that Dima’s way to looks for optimum operation point of the tube (setting balance for voltage vs. current sufficiency) turned out to be very successful as I d...
|
|
Contemplating now how to organize biasing for 3 singe stages of my 6-chanls amp I was faced the dilemma: do I need to bias my tubes. The 6E5P/6E6P are Russian tubes and it means that are very different right from the boxes. The Milq, driver tubes, be...
|
|
[quote user="be"]Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?[/quote]
I would be interesting to know how much plate voltage (and power) 6E5P would have with no bias. If ml8 would promi...
|
|
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...
|
|
Yes, decoud, the 6e5p-GM70 is an easy amp but 6e5p is a hell of voltage driver and I do not feel that a single 6e5p will be able to drive GM70 into grid currents. If people use dead speakers and need a lot of power than use the ability of direct hea...
|
|
I think it should be somewhere posted for my and perhaps for others future references. Here is the setting for testing Melquiades' single-stage tubes on Hickok 580/580A tube testers. To test the tube as a driver for a full Milq (two stages) set ...
|
|
AlloWell this could be very interesting.... the Melq driver (at lower voltage) direct coupled to a 6C33 cathode follower run at low voltage, high current. Vincent looks like he's running about 80V 500mA, though in this case you'd need to use a r...
|
|
Romy, Big thanks for your answers. But i've got another question :)You mentioned gas regulator as grid current "absorber".Very good point, because personally i hate to use resistor as a grid leak.Instead of it i'll use choke - almost with any tube, i...
|
|
Jim, I have sent you the tubes – it might be an interesting journey.
I send you:
1) 6C33C that was working with both cathodes approximately a year. It is not dead year but it is deep into retirement age. Run it at 220V and 200-250mA full-tube,...
|
|
[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
|
|
Ok, I just read your "Melquides Remote biasing". This technic can not be duplicate in my amp due to DC coupling, the C3G (I dont use 6E5P) driver stage basically adjust the 6C33C current in the output stage. Just for curiosity, I will build a mono bl...
|
|
Hey Cat,Well..my first question would be regarding the application. The big Melq tube is already doing the bass towers...is it not enough current? And wouldn't a proper class A 100w amp with its low low efficiency require something like 1...
|
|
.. and therefore I do not know how serious to take you.As far as I know as now there are no people who have built Melquiades. I know that up to now about 5 attempts to do it but no one finished it yet up to the point that might report result. Dima is...
|
|
My project to add 3 one-stages channels to Super Melquiades look like progressing (it means I will have the new 15,5:1output transformers very soon) and in context of upcoming changes and, after long consideration and some tests, I desire...
|
|
Another decision that I need to make about the new Super Milq. I have MF and Fundamental Channels around the Vitavox S2 drivers that will be driven directly from the single-stage amplifiers, with the crossovers and attenuators sitting at amplifier li...
|
|
Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...
|
|
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...
|
|
Hi Dima,Thanks for your comments; please forgive the chaos of what follows as I have to rush!
Agreed on all counts - the dc bias point would need adjustment and monitoring; I supposse it depends on how stable the electricity is from the wall; anothe...
|
|
Further looking at where I would like to take the new 6-chennal version of the Super Milq I am contemplating a new revision of my bass channel output transformer. Currently I have Jack Elliano’s made 450mA, large, single section LF transformer that b...
|
|
The value/type of the capacitor after the gas tube hugely affects sound. I made quite a number of experiments in past with those caps and I have no idea why it is so. Well, I hardly understand (and I did not see anyone who does) why the “gassed resis...
|
|
[quote user="Chirag"] It seems the 6e5p is driving the transformer directly. I've used various versions of even simple mosfet followers to good effect at the headphone level, but never considered using a speaker level transformer. Did you and D...
|
|
[quote user="drdna"]You want a suggestion for a good 2A3? Get Ricardo Kron's (KR Audio Enterprises) KR 2A3. Very rugged, overbuilt. There is no comparison between this tube and all other 2A3's, and I tried many of them. The sound is more dynamic, the...
|
|
|
|
|
All context of this site except the Forum's posts
Copyright © Roman Bessnow 2004-2013
All messages within the Site’s Forum Copyright © by
authors of the posts
|
|
Last 24-hours posts: |
3 |
|
 |
|
|
Total human visitors: |
9,408,552 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Froberger, Johann Jacob (1»
|
|
Böhm, Georg (2 Septem»
|
|
Goldmark, Carl (18 May 183»
|
|
Zweers, Bernard (18 May 18»
|
|
Mahler, Gustav (7 July 186»
|
|
Albéniz, Isaac (29 Ma»
|
|
Sauguet, Henri (18 May 190»
|
|
Zeisl, Eric(h) (18 May 190»
|
|
Anderson, Leroy (29 June 1»
|
|
van de Woestijne, David (1»
|
|
Pickenhayn, Jorge Oscar (3»
|
|
Allori, Pietro (18 May 192»
|
|
Wissing, Norbert (18 May 1»
|
|
|
|
|
|
|