1x Vintage NOS NEC Nippon (WE Japan) 5GK20 Rectifier Tube /Rare 5AR4 GZ34 Sub /Digital Test /Classic Tone High Resolution Smooth Neutral Playback /CV1377

update: our entire catalog is now available w/ digital test results, including gain, noise, waveform checks and more

the 5g-k20 is a unique 5ar4 gz34 alternative, made by the legendary nec nippon (western electrics intl division) 

this limited run rectifier was only made in the late '50s/early '60s, when tube makers took risks, + employed the best metals

Ef(V) / If(A) / Imax(mA) / Imean(mA) / Einv(V)

5G-K20 / 5 / 1.9 / 275 / 275 / 1100

5AR4 GZ34 / 5 / 1.9 / 250/ 450 / 1500

a tenured history accompanies nec nippon (western electrics intl division) known for smooth holographic sound reproduction

a classic big fidelity tube, w/ a revealing full-frequency audio spectrum, natural balance, great bass, and top resolution

the revered neutral response (w/ no weaknesses to put your finger on) compares w/ costly european british german sonics

est. way back in 1899, nippons playback quality became even more prominent in 1956 w/ sylvanias brief technical partnership

this set nec apart w/ unique sound curves! compared to brands that partnered w/ rca: hitachi, toshiba, ten kobe kogyo fujitsu

1x old stock vintage 5gk20 rectifier tube (5ar4 gz34 sub) by nec nippon, w/ rare box and carton wrap included
full digital mutual gm test + leak/short/gas/life/sound/waveform checks: pristine singles in stock: >100 % gm (65)

our high power output test applies 250v, measures the entire linear curve (eg-ip) simulating real circuits, all w/ filtered dc

give several sessions (up to 150+ hours) w/ your specific amps voltage to fully cure, break-in, and open up sonically

ships well packed worldwide! economy/priority/express postage available