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Old 26th June 2003, 05:54 PM   #1
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Default Which RCA 2A3 to buy?

single plate, dual plate, black plate, box plate? What is you opinion of the best sounding NOS RCA tube?
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Old 26th June 2003, 05:58 PM   #2
Joel is offline Joel  United States
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What's your evidence that there's any difference in performance between them?
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Old 26th June 2003, 06:20 PM   #3
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Being a tube newbie, I have no information to pull from. I just see some of these pull in exscess of $200 per tube while others run less than $100 per pair. So, somebody thinks there is a difference. I'm just trying to find out which are considered better and why.

I'm in the market for a set of 2A3 for a direct coupled 2A3 amp I'm building. I realize there is a large gap between a 1943 RCA single plate and a 2003 TJ Mesh. I'm soaking it all in like a sponge.
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Old 26th June 2003, 06:31 PM   #4
Joel is offline Joel  United States
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Quote:
Originally posted by Wardsweb
Being a tube newbie, I have no information to pull from. I just see some of these pull in excess of $200 per tube while others run less than $100 per pair. So, somebody thinks there is a difference.
Yes, and they probably have as much info as you do. Don't let price alone dictate your tube purchases. By that logic the best sounding amp would be made entirely of circa 1916 "audion" tubes, with voltage gains of 2, and 29% distortion.
IMO, no tube out there has specifications worth $200.
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Old 26th June 2003, 06:31 PM   #5
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Thumbs up 2A3

Hi,

It seems that the general consensus amongs die hard tubelovers is that the single plate versions are the ones to go for.

If you can still find some that is. Most of what passed through my hands ended up in Japan and Taiwan where they seem to be highly sought after.

I sold a pair of 2A3Ws (593x? something) recently and compared to what came standard with that particular amp, they sounded much better according to the customer.

If they're worth the extra expense is up to you of course.

So, it seems you're going to build yourself a Loftin-White, have you decided wat to use for the input yet?

Cheers,
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Old 26th June 2003, 07:14 PM   #6
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Joel - I know dollars will not be the deciding factor. I just wanted some input as to what people thing about these tubes versus buying some newer stuff, which would add a whole new level to the matrix of options.

fdegrove - Input via 6SL7 with a 5AR4/GZ34 for rectification.
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Old 26th June 2003, 07:32 PM   #7
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Hi,

Quote:
Input via 6SL7 with a 5AR4/GZ34 for rectification
Something along these lines?

Cheers,
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Old 26th June 2003, 07:36 PM   #8
Joel is offline Joel  United States
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Be more bold.
Why not use a 12AY7 with a 6SJ7 pentode as its plate load?

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Old 26th June 2003, 07:37 PM   #9
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Quote:
Input via 6SL7 with a 5AR4/GZ34 for rectification.
Sounds similar to the amp I just built. Mine is the JE Labs/Angela design, with an SRPP 6SL7 driver stage. Here's the 8-page thread on it:

Starting on my first amp, have some questions

I used Sovtek 2A3s, about $70 for a matched pair from www.triodeelectronics.com. I'm pretty happy with the sound of this amp, but of course I haven't tried any other 2A3s in it. The Sovtek's usually get favorable comments for being good inexpensive 2A3s. Apparently, they are also capable of higher power dissipation than some NOS 2A3s. I know the design I built runs them hotter than 15W. People have used the Sovtek tubes in this design for a year with no reported problems. I remember reading somewhere that NOS single plate RCA 2A3s are more "fragile", and shouldn't be run higher than 15W. I have no idea if that statement is accurate or not.
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Old 26th June 2003, 07:38 PM   #10
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Quote:
Why not use a 12AY7 with a 6SJ7 pentode as its plate load?
That would cost too much.

Cheers,
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