2. amps-preamps
  3. 1290083894

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
===========================
CAN I USE THIS TUBE WITH CARY 211m AE
AND WHAT ABOUT IT SOUND.
woodpark

Showing 3 responses by brf

brf
1,715 posts
 
Based on the above noted specification, yes these tubes will work in your Cary AE211 without issue. I have a lot of 845 tubes, but unfortunately, not the Sophia 845 Mk3 Carbon plate, therefore, I cannot comment on their sound.
brf
1,715 posts
 
The Sophia Electric 845 MK3 Vacuum Tube specification that you posted indicate that they take a maximum plate voltage of 1250V, which is normal for an 845 tube. Is Sophia claiming that the MK3 tubes cannot take that amount of plate voltage? Did they refund your money?
brf
1,715 posts
 
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.
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