tube at 9v

[Br4d13y]

are there any 9 pin tubes that can run and get decent saturation at 9v power?

[mac]

iirc 12au7 was designed for 12v.

mac

[Br4d13y]

are there any subminis that run well at 9v?

[nordine]

6111

[frequencycentral]

6111

Though you need to run the heater a 6.3 volts. 

[Br4d13y]

What size resistor would be needed to take 9v to 6.3v?

[frequencycentral]

What size resistor would be needed to take 9v to 6.3v?

2.7 volts / 300ma = 9 ohm
2.7 volts x 300ma = 0.81 watt

So a 10 ohm /1 watt would give 6 volts (within the heater's tolerance) and handle the heat.

Or just use a 7806 voltage regulator.

[Br4d13y]

Sweet , I am gonna use ranks tube as a diode in my ts 808 clone. The real TUBE screamer

[petemoore]

  I forget what all was said about just throwing a tube in a TS, because it's that picture near the bottom at GEO 'how to get tube sound in a stompbox' IIRC, it showed a hammer being used to 'fit' a tube in the TS.
  Whatever it was, messing about @ low voltage with tubes should be good fun !
 
 

[Renegadrian]

You might want to try the 9AU7, which is the 12AU7 sister, only difference being the heater voltage. You can find one darn cheap thru the 'bay...

[Br4d13y]

You might want to try the 9AU7, which is the 12AU7 sister, only difference being the heater voltage. You can find one darn cheap thru the 'bay...

what is the gain on that?

[Renegadrian]

http://www.nj7p.org/Tube4.php?index=1