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RE: How much longer do 2a3s last at 10w??

Dennis Fraker reports on this Forum getting 50,000 hours PLUS on AVVT meshplate 2A3s at 41-43 mills, 245 P-K, AND equally important, they sound better there. As compared to the usual 2,000 hours (to maybe 10,000 hours) and degrading continuously after about 200 hours of initial service.

If you can get 50,000 hours, spending money for a EML meshplate becomes totally justifiable, or, a less expensive JJ2A3-40 is a no-brainer!! (Either of those brands readily outperform the tubes in this thread you were considering.) The JJ has a 40 Watt 300B plate, so it is in "loaf mode", long lived enough for your grandkids to enjoy hearing.

Yes, Thorsten has heard and reported about reduced dissipation also, but Dennis Fraker was designing his 2A3 amps this way in 1989. A Type 45 is usually rated and run at 10 Watts dissipation, and it is that dissipation we (mostly Dennis) suggests for the 2A3. For a Type 45, we have reported it best at 7 Watts dissipation, lower current, maintain the voltage at about 250 VDC P-K.

Cheers,

Jeff Medwin



Edits: 07/10/12
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