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In Reply to: RE: 300bs at 300volts posted by jonny- on May 07, 2012 at 14:29:30
At 300v, you would want to use high current to get the dissipation up to 30 watts or so. At 18watts, you should use a 2A3, they sound sweeter.
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It is only low relative to the higher dissipation points (yep, I just stated the obvious) and on a power per $$$ basis. It is not low in any important (for me) sense; for example, not so low it cannot operate effectively etc.Regarding sound quality, I think it depends on the 2A3 vs. 300B being used and the I/V ratios used. For ~ 4W output, I'd be inclined to think a 300B would be more appropriate. At 2W output, I'd likely opt for a 2A3 (at lower current and higher load than common). For 1W+ I'd likely opt for a 45 at the textbook 250V operating point.
I have read some claims of the 2A3 to be 'sweeter', especially in posts form back in day. I'd ask what 2A3 and what 300B, at what operating points and load, in what type of circuit? Others claim the 2A3 to be relatively tonally dry and mechanical yet airy. I'd ask the same questions...
If a NOS 2A3 and inexpensive modern 300B are compared, both using their more traditional operating points, then a 2A3 might likely sound “sweeter”. But...
Cheers.
Edits: 05/11/12
To quote Eric Barbour for the 300B, "thou shalt not exceed 60 ma and 450 volts"
I also agree with Barbour that an 811 properly implemented will slay any 300B design.
The Mind has No Firewall~ U.S. Army War College.
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