Nik
Headphoneus Supremus
This is what I found about the 6C45 used in my “R-10H”.
The new 6C45 Sovtek tube
“The best discover I've recently made is the new 6c45 Tube. This little monster si able to dissipate 8w, has insignificant noise and 900ohm Rp (!).
From the 1st moment I saw the specs I've recognized this will be "the new millennium tube".”
Tube mavens Sovtek are now offering their 6C45 high Mu single triode tube. Originally designed for military communications and radar for the Russian armed forces, and only previously known as an extraordinary audio amplifier to a small group of circuit hackers from the Eastern Block, the 6C45 is now available at $29.80 each. Basically, the 6C45 is a high Mu single triode with a low plate resistance and a very high transconductance. The input noise resistance is 100 ohms, very low input/output capacitance and the dissipation are nearly 8 watts which Sovtek claims makes it "an ideal candidate for pre-amp, driver and signal processing applications." Added benefits of the tube are that it is very quiet. Sovtek says that "One would have to parallel 15 dual 12AX7-type tubes (that's 30 sections) to get the noise voltage down to one single 6C45." Meanwhile the distortion products are lower than the 6922 but at 2/3 more gain (see chart below).
6C45-Pi Tube Data
Filament voltage 6.3 volts
Filament current 440 ma
Typical operating conditions
Plate current 40 ma
Plate Voltage 150 volts
Grid Voltage - 9 volts
Transconductance 45,000 umho (45 ma/V)
Mu Factor 52
Interelectrode capacitance
input 11 pf
output 1.9 pf
Maximum Ratings
Plate voltage 150
Heater/cathode voltage 100
Cathode current 52ma
Plate dissipation 7.8 watts
DC grid circuit resistance 150K ohms
Pinout:
1 Cathode
2 Grid
3 Cathode
4 Filament
5 Filament
6 Cathode
7 Anode
8 Grid
9 Cathode
Note: As with some other high gain, high transconductance tubes (such as EC88/6DL4/8255), there are multiple cathode & grid connections.
The new 6C45 Sovtek tube
“The best discover I've recently made is the new 6c45 Tube. This little monster si able to dissipate 8w, has insignificant noise and 900ohm Rp (!).
From the 1st moment I saw the specs I've recognized this will be "the new millennium tube".”
Tube mavens Sovtek are now offering their 6C45 high Mu single triode tube. Originally designed for military communications and radar for the Russian armed forces, and only previously known as an extraordinary audio amplifier to a small group of circuit hackers from the Eastern Block, the 6C45 is now available at $29.80 each. Basically, the 6C45 is a high Mu single triode with a low plate resistance and a very high transconductance. The input noise resistance is 100 ohms, very low input/output capacitance and the dissipation are nearly 8 watts which Sovtek claims makes it "an ideal candidate for pre-amp, driver and signal processing applications." Added benefits of the tube are that it is very quiet. Sovtek says that "One would have to parallel 15 dual 12AX7-type tubes (that's 30 sections) to get the noise voltage down to one single 6C45." Meanwhile the distortion products are lower than the 6922 but at 2/3 more gain (see chart below).
6C45-Pi Tube Data
Filament voltage 6.3 volts
Filament current 440 ma
Typical operating conditions
Plate current 40 ma
Plate Voltage 150 volts
Grid Voltage - 9 volts
Transconductance 45,000 umho (45 ma/V)
Mu Factor 52
Interelectrode capacitance
input 11 pf
output 1.9 pf
Maximum Ratings
Plate voltage 150
Heater/cathode voltage 100
Cathode current 52ma
Plate dissipation 7.8 watts
DC grid circuit resistance 150K ohms
Pinout:
1 Cathode
2 Grid
3 Cathode
4 Filament
5 Filament
6 Cathode
7 Anode
8 Grid
9 Cathode
Note: As with some other high gain, high transconductance tubes (such as EC88/6DL4/8255), there are multiple cathode & grid connections.