6sn7 operating points

[easphyx]

The 6SN7 is a neat tube, and it can do some suprisingly good things at low current. If you check the table on page three of this datasheet-

http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6SN7GTB.pdf

Yes, I refer to the same datasheet. These values gives sub-mA currents.

 

[Remolon]

[FONT=Arial, sans-serif]It depends on the needs, but with a power supply of 260 VDC, a CCS of 5 mA and -4 volts for the bias could provide a good response.[/FONT]

 

[Lingwendil]

[FONT=Arial, sans-serif]It depends on the needs, but with a power supply of 260 VDC, a CCS of 5 mA and -4 volts for the bias could provide a good response.[/FONT]

I'm putting together some cathode followers running 250V and 5mA per triode soon, it is indeed a good operating point, and with a CCS feeding down to a -12v rail, and a DC bias servo, will make a nice buffer.

 

[easphyx]

[FONT=Arial, sans-serif]It depends on the needs, but with a power supply of 260 VDC, a CCS of 5 mA and -4 volts for the bias could provide a good response.[/FONT]

I'm trying to design another one hybrid amplifier. This time with minimal feedback.

With 5m CCS and -4V bias the plate voltage is about 142V. 118V will drop on your CCS.

 

[Remolon]

[FONT=Arial, sans-serif]With the plate curves of RCA or GE, a -5 volts bias is better. It will give a theoretical plate voltage of 157V, an amplification factor of 20 and a maximum output of 200Vpp.[/FONT]