The Chinese 12AX7B valve is a great choice for high gain guitar and hi-fi amps . It has a little more gain than the standard 12AX7A valve and lower noise.
These are premium tested on specialised digital and analogue testing equipment by Karltone as follows
- Gain (A)
- Transconductance (gm)
- Noise (dbv)
- Emission Quality
- Grid Leakage
Test results are provided with purchase