sophia 845 markIII and cary 211M AE


specification of this tube:-

Sophia Electric 845 MK3 Vacuum Tube Specification

Nominal operating conditions and parameters:
Filament voltage 10.0V
Nominal filament current 3.2A
Plate voltage 1250V
Grid voltage -200V
Plate current 80mA
Plate resistance 1.7 Kohms
Amplification factor 5.0
Load resistance 3.4 Kohms
Signal voltage(pk) 69.0V
Output Power 25W

Limiting Operation conditions for safe operation-nor simultaneous ratings:

Maximum plate voltage 1250 volts
Maximum plate dissipation 75 watts
Maximum plate current 120 ma
Maximum input power of signal 150 Watts
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CAN I USE THIS TUBE WITH CARY 211m AE
AND WHAT ABOUT IT SOUND.
woodpark
I find Sophia's statement confusing. Their website claims the Sophia Electric™ 845 MK3 Carbon Plate Tube is a RCA 845 direct replacement but it will not operate in an amp spec'd for 1000v on the plate, which is normal for an RCA 845.
I agree with Brf. I wonder why they can claim that this is RCA standard while the max plate dissipation is only 75W vs. 100W. This could be the reason why these Sophia tubes didnt work in the OP 's amps? I too own a pair of Cary 211AE , love them, but i am afraid of replacing original tube with these kind of "upgrade" tubes and have them blow up in my amps!