frame grid construction was first produced by Siemens 1952. The most popular frame grid tubes are the Telefunken ECC803S but also the US made 6922 (E88CC).

The benefits of frame grid construction are:

– allows much higher gain; higher transconductance (Gm)
– lower input capacity, allowing higher limiting frequency
– almost no microphonics (stiff frame, resonant frequency of grid wire >20 kHz, beyond hearing limits)
– significantly lower hissing noise level

5751 General Electric USA, NOS
double mica, large Halo-Getter, grey plate
version: green marking or white marking pieces in stock

Lower Gain ECC83 type tube. great for clean tone with mild top end compared with « regular » ECC83/12AX7
Pro’s choice for improved Fender Clean-Tone

a bit warmer mids comparted to the SYLVANIA 5751

A completely new production based on the manufacturing technology obtained from Full Music. The development and material composition of the PSVANE 12AX7-S has been specially optimized with the aim of the ideal audio tube. The noticeably improved audio quality compared to regular 12AX7 ( = ECC83, 7025, CV492, CV4004) tubes and the
Gold-plated contacts guarantee long-term freedom from corrosion and ideal contact properties.

All parts are selected to the highest standard, assembled only by highly experienced workers.
Suggested break-in persiod is 50-80 hours.