|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
It turned out that I end up with 4V tubes for MF channel and am running my YO186. The 2A3 tubers I kind of have left on peripheral of my interests. It is not the 2A3 tubes are “bad”. I did not go deep with 2A3 and did not try their expensive sin...
|
|
[quote user="drdna"]
Having received a bunch of tubes, I have spent some time listening….[/quote]
Yes, it looks like the Sovtek 2A3 are remarkably bad, even I with my stinky Tannoy was able to get it. Regarding the rest of your comments I ha...
|
|
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...
|
|
First of all, this not an attack on NOS tubes and it is all meant to be just sort of fun and educational. I happened to have all these 2A3 tubes side by side for comparison, so why not? I also have done the same thing with other tube types like 6SN...
|
|
Adrian, Romy, et al, Okay, I don't take any of it as an attack... so none of that bothers me.... I'm fine with it... again, it's a view on what you heard based on your test scenario, nothing more and I certainly welcome the review. Now tha...
|
|
It turned out that I end up with 4V tubes for MF channel and am running my YO186. The 2A3 tubers I kind of have left on peripheral of my interests. It is not the 2A3 tubes are “bad”. I did not go deep with 2A3 and did not try their expensive sin...
|
|
Romy, I did some models using a 400V supply and a 6K OPT load. It's easy to get 4 watts output in this configuration, but using a 2K cathode resistor results in higher distortion and a weak transfer curve. Plate dissipation is around 11 wa...
|
|
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...
|
|
It is not the subject that I closely observe at this point but I have to tell you that paling with my new MF amp I do develop some linking to Chinese Shuguang tubes. They are pretty good and for $75 per pair new they are surprisingly good. I am not f...
|
|
[quote user="drdna"] Well, and I have a dozen of them sitting here next to my desk while I am building my Milq amp s-l-o-w-l-y so I guess I will discover my audio intelligence level sometime after the New Year.[/quote]
That is so cool that you...
|
|
[quote user="drdna"] Well, and I have a dozen of them sitting here next to my desk while I am building my Milq amp s-l-o-w-l-y so I guess I will discover my audio intelligence level sometime after the New Year.[/quote]
That is so cool that you...
|
|
[quote user="Paul S"]So what's wrong with the 6SN7, apart from the high prices fetched by good ones? If building a 2A3 amp for personal use, it seems a likely choice. I do not know the 6E5P, but I do love the tone of the 6SN7, and I espec...
|
|
I do not remember details already but Dima and I had the same discussion a few weeks back. After all his research he was very much disagree with textbook use of 2A3. He felt that max power and the most proper operation of this tube will be at 275...
|
|
First of all, this not an attack on NOS tubes and it is all meant to be just sort of fun and educational. I happened to have all these 2A3 tubes side by side for comparison, so why not? I also have done the same thing with other tube types like 6SN...
|
|
[quote user="Romy the Cat"]I was thinking about this: how come that driving 6C33C (in fact driving anything one can imagine) the 6E5P was very fine but driving 2A3 it was dull like hell. I opened the amp and tested all – everything was perfect but th...
|
|
[quote user="Romy the Cat"]BTW, I run today the Chinese 2A3 and they were much better then Sovtek tube, much-much better, in fact I was very surprise how bad the Sovtek were.[/quote]Having received a bunch of tubes, I have spent some time liste...
|
|
Romy, don't be so sure the amp is 2-stage. The ECC99 is a twin triode (mu=22, Rp around 2k) so the two sections could be cascaded, paralleled or the second section used as a CF or several other possible topologies.
Their 2A3 is rated up to 40W pl...
|
|
You will be happy to hear I have got the new 2A3 tubes. I have spent the evening listening to them all. Some very interesting results! I will be posting soon...
Adrian...
|
|
Just some additional thoughts on the new generation of 2A3 tubes. The only ones I would seriously consider are the Kron Enterprises, the Sophia Electric, and the Emission Labs tubes. If I did not hear these side by side over an extended period of ti...
|
|
[quote user="drdna"] I also use the 6SN7-2A3 DHT for my system (except subwoofer). Did you use the Electrocubes for the coupling capacitors? Was the internal wiring regular copper?
The coupling capacitor is critical, of course.
Also, I will say t...
|
|
[quote user="Romy the Cat"]Can you post or explain the topology of your 6SN7-2A3?[/quote]The amplifiers I use started from a kit I bought, the Moondog, so here you can see the basic topology. It is very simple. The first stage here can be eliminated,...
|
|
Dealing more with Sun Audio SV-2A3 kit it amassed me how bad the kit was. The guys made very cheap, in fact I hardly believe that this company has anything to do with Japan – it looks more like K-Mart level of amplifier. I heard a number of very posi...
|
|
[quote user="slack key"]I know that speaker position and room acoustics are important. I use a laser to align the speakers, room treatments, hallographs, crystals, ionizer, Z-sleeves, bybee filters, etc. I also have power conditioners, installed de...
|
|
Okay so I got the NOS Sylvania "Spring Top" dual filament 2A3 tubes and have been listening to them for a while, now I am ready to make a report on the tube.
The tube is well built and structurally sound. Tapping gives a very small "tabla" sound ...
|
|
[quote user="drdna"] How about using the 6C33C for the low midrange-woofer, the 2A3 for the upper midrange, and the 45 for the tweeter? I suspect if each circuit can be optimized, that they can do their best within each frequency range. [/quote] Hm…....
|
|
This subject does not bother me too aggressively as I recognize absolutely no sonic demands or listening temptations to change anything in my playback. However, there is a theoretical and conceptual curiosity on my part and I would like to learn what...
|
|
[quote user="Romy the Cat"]It is obvious that 6SN7-2A3 and 6E6P direct have very different character. The 2A3 it feels like heavy-sunk time of tube and it constantly run a fully submerged. It has seriousness but it does not look at this point that i...
|
|
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...
|
|
[quote user="Romy the Cat"]Are any of those new tubes besides the Chinese tubes are single plated?[/quote]I believe they are all single plated.
[quote user="Romy the Cat"]I have bought some very nice 2A3 and 6A3 double plated from 1942 and 1944 an...
|
|
Romy and drnda,
When you speak of the "Chinese 2A3" which one do you mean? Romy, if you have the Shuguang 2A3C then I understand why you find it better than the Sovtek, no argument there! drdna, the Shuguang is a little more extended on top than t...
|
|
|
|
|
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: |
2 |
|
 |
|
|
Total human visitors: |
9,431,203 |
|
|
|
|
|
|