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Hello againIts easy to find the data for the original 2A3/6B4 but where can I get the Sovtek data? Surely the company must have data sheets for their own brand tubes but I can't seem to find them anywhere.
Cheers
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Triodeel.com has this listed as Sovtek 6b4-G data.Tre'
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Jey over in SET Forum just posted this for another message.
I remember this article: it is a Product Review, and published complete curves, and a sampling for consistency, and the consistency was fairly good. This was 8/01: things change, especially in the sovyet tube business. Ask Victor K if he thinks this data could still be trusted. or ask Sovtek for newer data.Here's data from AudioXpress 8/01 Product Review of Sovtek 2A3 Platinum Matched Tubes.
Comparison of 2A3 plate currents @ Vak= 250VDC, Vg= -48VDCSample 1
IP(mA RMS) 27.7, Gm(mA/V) 6.34, u 6.49, Rp 1.02K, P 6.94W
Sample 2
IP 29.2, Gm 6.03, u 6.34, Rp 1.05K, P 7.33W
Been using Sovtek 2A3's in my Fi-Primer Loftin White for over a year.
Hope this helps?
jey
Anyway, I hope this helps.
-3db
JC Morrison posted that the Sovtek was built to be a 2a3 and should be used as one. So the NOS 2a3 data is all you need."the sovtek 2A3 is manufactured to match the transfer characteristic of a 2A3 as much as possible. measurements made by us as well as by others (audio amateur has plate curves in its review of the tube, for example. so does costruaire hifi...) indicate that this is in fact the case. you can use RCA's curves, or ours... big schmear. the center values are the same."
Tre'
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"Still Working the Problem"
Hi
Thanks for the info. I really want to know the max anode dissipation max voltage etc. I know that the NOS 2A3/6B4 is good for only 15 watts but what about the muscular looking Sovtek?Thanx
I'm sorry but I can only refer you to what JC Morrison said. I don't know where to get the tube data for the Sovtek 6b4."the sovtek 2A3 is manufactured to match the transfer characteristic of a 2A3 as much as possible. measurements made by us as well as by others (audio amateur has plate curves in its review of the tube, for example. so does costruaire hifi...) indicate that this is in fact the case. you can use RCA's curves, or ours... big schmear. the center values are the same. if you are looking for a piece of paper that will tell you that you have permission to raise the plate voltage to 450 volts, forget it. i'm the one that would be printing such a thing and i promise you that won't happen. the sovtek 2A3 materials (the plate we use in the 300B) make it a little sturdier in terms of heat but thats it. this means that you can raise the plate voltage and current a bit without overheating the cathode (big problem when you do that because you change the transfer characteristic), but you want to be aware that the cathode is only capable of so much emission in the first place. certainly *NOT* 40 watts worth. material choice can influence safe area of operation as well as the behavior of the tube near saturation and at cut-off. this can be significant in terms of sonics because as the tube moves into these transition areas, they become non-linear. that is not simply non-linear in the sense of harmonic distortion or intermodulation. i mean this in the classical sense, which is to say that they cease to be simple and predictable. because of the low Mu and close spacing of the elements (also a wide grid pitch), i certainly wouldn't recommend running it at 400 volts but you are free to do what ever you like to them once you get them in your grubby little mitts."
Tre'
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"Still Working the Problem"
Maybe not the claimed 30W, I think 22W was posted as the realistic limit, but still higher than NOS at 15W.
JC claims if you run them as other than 2a3 then it's not a 2a3. You have changed the transfer characteristic and it's not a 2a3 (6b4) anymore. Not that it can't be done but that it 'shouldn't' be done.But like he says "once you buy the tube it's your's and you can do whatever you want with it"
Correct me if I'm wrong but didn't JC design that tube?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
...but run hotter than 15W, it may sound different but not necessarily worse (maybe more like a 300B?) and may put out a little more power. It all depends on what the user wants.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
but its not a big deal. Output transformer load, currents and voltages otherwise work out the same, so it seems to be a slight difference in mu, a tad too much to be tube variance.
One last question. Is the 6B4 filament centre tapped like a 300B? I ask because I can only use AC heating due to space limitationsThanks
There are only four pins to a 300B. Two are the ends of the filament, the other two are grid and plate. You'd need a fifth pin to CT the filament.You create the virtual CT with the hum pot across the filament. Even with PP, two separate heater TX's, one winding for each filament in combination with a hum pot is enough to get the cathode's hum contribution out of the picture. Most tubes are good enough a simple CT winding can do the trick...but it is no guarantee.
it won't be a concern as long as you are attentive to filament phasing.
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