In Reply to: RE: PSE 2a3 operating points? posted by andy evans on May 26, 2012 at 04:50:47:
Hello Andy,First of all, what is your speaker load? By that, I am asking how efficient is it, and what range will the amps be used for..full range or ??.
Have you ever actually MEASURED in your listening room how much power your speakers need when you play them loud?? That is your starting point - to determine power needed Andy.
IF your speakers are efficient, 98 dB / 1 Watt / one meter, you might be better off with a simple SE amp. This avoids paralleling's "choir" effect.Forget 6B4Gs, they require DC on the filaments, which asymmetrically biases the filament, and this simply is inferior sounding compared to AC operation of a 2.5 VAC (2A3) filament.
Also, biplates, be they a 6B4G or a 2A3, generally will not equal a JJ 2A3-40 in performance, due to (1) the later's monoplate construction, aspects of the JJ's design such as (2) large cathode surface area, (3) symmetrical filament spacing, etc.
IMHO, its hard to beat the cost-versus-effectiveness of the new JJ 2A3-40.
Better to (1) FIRST determine your power needs by direct measurement and (2) use the best possible, simplest design choice, rather than spend time and money on needlessly compromised implementations. Have fun.
Jeff Medwin
Edits: 05/26/12 05/26/12 05/26/12
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Follow Ups
- Do you need PSE ???? - drlowmu 05:45:58 05/26/12 (14)
- RE: Do you need PSE ???? - dave slagle 15:53:32 05/26/12 (10)
- ... "bunk" ... so you think ??? - drlowmu 15:04:55 05/28/12 (3)
- DC Vs AC filaments aside ... - Naz 00:20:10 05/29/12 (0)
- RE: ... "bunk" ... so you think ??? - dave slagle 18:56:04 05/28/12 (1)
- RE: ... "bunk" ... so you think ??? - drlowmu 07:44:59 05/29/12 (0)
- RE: Do you need PSE ???? - Tre' 11:01:35 05/28/12 (2)
- RE: Do you need PSE ???? - dave slagle 19:20:30 05/28/12 (1)
- phase cancellation? - shane. 02:24:01 05/30/12 (0)
- RE: Do you need PSE ???? - drlowmu 16:40:55 05/26/12 (2)
- Not Quite Right... - Triode_Kingdom 05:54:06 05/30/12 (0)
- you CAN"t be serious ... - mikeyb 10:00:25 05/29/12 (0)
- RE: Do you need PSE ???? - andy evans 07:02:43 05/26/12 (2)
- RE: Do you need PSE ???? - drlowmu 08:12:17 05/26/12 (1)
- RE: Do you need PSE ???? - andy evans 09:55:59 05/26/12 (0)