EF86 in R.E.D.47

[kambo]

how much gain is available at first stage of R.E.D.47 micre. (EF86 )

edit : there use to be explanation of circuit. cant fint it ???
edit  : without the negative feedback.

 

[ruffrecords]

It is probably around 40dB.

Cheers

Ian

 

[kambo]

It is probably around 40dB.

Cheers

Ian

thanks Ian,
are u including input TRX gain or this is just the tube gain  itself...

 

[ruffrecords]

It is probably around 40dB.

Cheers

Ian

thanks Ian,
are u including input TRX gain or this is just the tube gain  itself...

Just the EF86

Cheers

ian

 

[kambo]

wow, ( IMHO  )

thanks Ian.

 

[ruffrecords]

wow, ( IMHO  )

thanks Ian.

It's a typical value for a pentode stage. Gain is basically gm * RL where gm is the tube's mutual conductance at the operating point and RL is the plate load. gm is typically 1mA/V and you have a 100K plate resistor hence the gain is 100 times of 40dB give or take.

Cheers

Ian