Anyone seen the JJ 2A3?! - diyAudio
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Old 29th April 2003, 11:59 AM   #1
stigla is offline stigla  Norway
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Thumbs up Anyone seen the JJ 2A3?!

I just spotted, that JJ has started making the 2A3!

http://www.jj-electronic.sk/

Max rated at 40W, 100mA (cathode bias) and 450V

Curves looks nice too!!I wonder if it's a single plate construction... Hope so!

Anyone know the price?
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Old 29th April 2003, 12:11 PM   #2
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Interesting.

I wonder if 40W will hold true. Their KT88 Is rated at 46W in triode mode which is to much for that tube. I have found that 40-42W is the limit.

Carl
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Old 29th April 2003, 01:11 PM   #3
stigla is offline stigla  Norway
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The JJ239 was developed on request from customers from Southeast Asia and Japan after the 2A3-40W tube was introduced..
The 2A3-40W showed as having the best sound in the group of power triodes.
Like the 300B, the 2A3 has perfect linearity due to the design of the internal geometry. The sound quality however, is even better because the cathode heater voltage is only 2.5V and the filament ends potential difference with respect to -Ug is smaller than in the 300B tube. Therefore, a much bigger cathode area is active during operation. (The maximum current flows at the positive filament end.)
The ideal cathode heating current Ig would be, for example, 50A at 0.1V. The sound difference between 2A3 and 6A3 is remarkable.


Found this text on the JJ239 SE 2A3 / ECC99 amp...
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Old 29th April 2003, 01:19 PM   #4
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Out of curiousity, any idea what these tubes cost?
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Old 29th April 2003, 01:49 PM   #5
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AU$425 per pair
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Old 29th April 2003, 02:51 PM   #6
EC8010 is offline EC8010  United Kingdom
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I looked at the site, and the photograph of their single-ended amplifier using the 40W 2A3 showed a valve with a single anode construction. Given the price, they would need to be amazing.
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Old 29th April 2003, 02:56 PM   #7
SY is offline SY  United States
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Quote:
Originally posted by Bas Horneman
AU$425 per pair
Pick me up off the floor! Jeez, you can buy REAL tubes for that kind of money.

"Perfect linearity." Well, I guess we can all go home now.
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Old 29th April 2003, 03:30 PM   #8
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Prices found on
http://www.thomsonaudiodesign.com/parts.html
site

But they also ask $AU425 for a pair of JJ300B...

If I look at the http://www.ae-europe.nl/buizen_jj.htm site
the JJ300B pair would cost around US$ 207 (including VAT)meaning the 2A3 would cost the same..meaning US$ 207 for a pair..

Thus from AE-europe they would cost 207... (Would you believe I sucked at maths when I went to school?!?)

Better?

Cheers,
Bas


PS...That would alse mean that a complete set of JJ2A3 + Chokes, Power Transformer and output transformers from AE would set you back just 450.. NOW we are cooking!
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Old 29th April 2003, 04:58 PM   #9
SY is offline SY  United States
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Well, let's see, I can get twice the anode dissipation and four or five times the transconductance for half the money. How is that "cooking"? Of course, other tubes don't have "perfect linearity"...
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Old 29th April 2003, 05:07 PM   #10
Joel is offline Joel  United States
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