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Old 19th May 2005, 02:52 PM   #1
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Default 2a3, single plate-double plate?

I have built the JElaBS 2A3 2001 EDITION ,sounds great
I hve tried different 6sl7 tubes and would like to try different
2a3 , In the text on the Angela website they recomend double plate ,not rare or vintage single plate. PLate dissapation is 17 watts. I have sovtek 2a3 now and those are single plate.
Does this mean the old RCA 2A3 are out , and what is the factor that determines that single plates are not optimum.


Jeff
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Old 19th May 2005, 06:52 PM   #2
Gluca is offline Gluca  Italy
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I am currently building a 2A3 PP amp and I got a pair of matched Valve Art (double plate) and a pair of matched JJ (single). I can say that hum is much better with JJ (5mv vs 30mv!!) and bandwidth very similar. Square wave test gives sharper results with JJ while VA smooths out some local oscillations as well the edges. BTW prices of JJ are far higher. Can't say more as I am not finished with the first monoblock.

Ciao
Gianluca
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Old 20th May 2005, 11:30 AM   #3
SHiFTY is offline SHiFTY  New Zealand
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Well a 2A3 kinda looks like a parallel 45, so I would imagine 17W on an RCA double plate would be just fine...
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Old 20th May 2005, 01:06 PM   #4
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In some data sheets max. dissipation is listed at 15W for 2A3. I believe this refers to the original RCA single plate version. The double plate version can tolerate a slightly higher dissipation. I think the original single plates are too expensive and rare to risk at more than 15W.

Sovteks, though single plate are a different animal and can be run harder.
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Old 20th May 2005, 02:08 PM   #5
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Default plates

crystal clear . Thanks



Jeff
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Old 30th October 2005, 09:03 AM   #6
robot is offline robot  Croatia
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hello to all of you, I m preparing to built a 2a3 set amp. and I m interestied which tube is best buy according to sound and the price, which nos and new tube,

thanks,
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