Western Electric 212E
If you cannot find Western Electric or STC 212 tubes, worry not! Psvane has come up with a replica and is rumored to be as good as it gets!
Psvane 212
This tube has been featured in a HK magazine - read about it here.
We have received an order for Level 3 Nanocrystalline double C core output transformer for this tube and therefore we'd like to share the results with our followers as well. It is a 22KG pair of state of the art output transformers! For those that knows output transformer design, they would have understand how difficult it is to design a big size wide bandwidth output transformer as the parameters actually work against the results.
Parameters:
·
Nanocrystalline
double C core
·
Output
power: 70W (20Hz)
·
Measured
frequency response
o
20Hz
(-0.23dB) – 1kHz (0dB) – 20kHz (-0.41dB), 8 Ohm, 1W
o
Full
bandwidth: 5Hz – 70kHz -3dB
·
Primary
impedance: 5KΩ，secondary: 0-6-8Ω
·
Primary
DCR: 130.1Ω （130.2Ω）（B-P，26℃）
·
Secondary
DCR: 0-6Ω tap
- 0.27Ω，0-8Ω tap
- 0.31Ω
·
Primary
inductance 28.9H（28.1）（measured at primary current 150mA，20Hz，5Vrms）
·
Primary
current: 280mA (maximum), recommended optimal at 150mA
·
Efficiency：0-6（>93%），0-8（>93%）
Measurement
condition: Shuguang 845 x2 (parallel), plate voltage 1000V, plate current 150mA，fixed bias, and
secondary 0-8Ωtap connected 8Ω, power at 1W.
Matching results:
· Primary
DCR <2%（0.2Ω）
· Primary
inductance <5%（0.9H）
 |
| 212 Output Transformer Frequency Response |
J&K Audio Design
7/10/2015
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