Hello guys,
I've designed a tube preamp using the Russian 6n16b double triode. Is a miniature triode with a maximum anode voltage of 100v. The heaters eat abou 400mA @6.3v (is the standard heater voltage). I used about 80v for anode voltage.
The design has 1 gain stage and 1 cathode follower to drive a marshall like tone stack. The voltage devider was designed for 30Vpp input level and for 2Vpp output level,
The scematic and the BOM:
Capacitors C1 10uF
Capacitors C2 C5 C6 0.022
Capacitors C3 0.001
Capacitors C4 680p
Capacitors C7 47uF / 100v
Resistors R1 R5 1M
Resistors R10 50k
Resistors R11 200k
Resistors R12 15k
Resistors R13 500k Log.
Resistors R14 100
Resistors R2 250
Resistors R3 R6 20k
Resistors R4 1M
Resistors R7 56k
Resistors R8 250k
Resistors R9 500k
Tubes VA1 VA2 6N16B

You could also use 6N17b as a substitute for 6n16b (6n17b have much more gain then 6n16b but the maximum anode voltage is 200v).
6n16b and 16n17b are submini double triodes.
Best regards,
Gabriel Tudoran
Analog Sound
PS: The schematic is verified to work as described. Audio samples soon.