PSVANE Mark II KT88-TII Vacuum Tube Replace KT88 6550 Collector Edition For Vintage Hifi Audio Tube AMP DIY Upgrade Pair Quad (one pair)

NOTES: Price = one pair (2pcs)

Sound characteristics:
The mid-range is fuller, full of boldness, full of charm, good vocal details, three-band balance, excellent extension of high and low ends, beautiful high-frequency exquisite and smooth, strong low frequency, wide and thick sound field, especially rich details 5 series The above is far more than the modern engraved tube like "Big Shield". The overall sound field is wide, sweet and rich, and the lines are clear.

Detailed Specifications: 

Heater

Uf  ……………6.3 V
If…………………………1.6 A

Maximum Rating
Ua……………………800 V
Ug2………………600 V
Ug1………………-200 V
Pa………………42 W
Pg2…………8 W
Ua+g2…………46 W
Ik……………………230 mA
Uh-k……………200 V
Tbulb…………………250 C

Rg1
with cathode bias
Pa+Pg2≤35W 0.47 MΩ
Pa+Pg2 > 35W 0.27 MΩ
with fixed bias
Pa+Pg2≤35W 0.22 MΩ
Pa+Pg2 > 35W 0.10 MΩ

Direct Interelectrode Capacitances
tetrode connection       triode connection
input………16 9.3 PF
output ……… 12 17PF
grid to plate………1.2 7.9 PF

tetrode connection
Ua…………………… 250 V
Ug2……………………250 V
Ia ……………………140 mA
Ig2(approx) ………3 mA
-Ug1(approx)………15 V
Gm ……………………12 mA/V
ri ……………………12 KΩ
Ug1-g2……………… 8

ri ……………………670 Ω
u………………………8

triode connection
Ua.g2…………………250 V
Ia+g2…………………143 mA
-Ug1(approx)………15 V
Gm ……………………12 mA/V