[HBR] Re: HBR Digest, Vol 55, Issue 5

[Peter Bertini]

On Wed, Sep 17, 2008 at 7:35 PM, Ian Wilson <ianmwilson73 at gmail.com> wrote:
>>  I've been told that the 6JH8 works best
>> with 0 volts on the deflector electrodes.
>
> Actually, the data sheet states that the deflector
> bias voltage for maximum sensitivity is -14V. The
> easiest way to do this is with a (bypassed) cathode
> resistor of suitable value. You will need to reference
> the control grid to a tap on the cathode resistor if
> you do this.
>
> 73, ian K3IMW
> ************************************

I'm going to have find the full data sheets for that tube!!!  What tube manual
are you using?

I'm still tempted to return the voltage divider to a negative bias to
take advantage
of the negative feedback by taking the deflector bias directly from the plate.
(That would be for the product detector which would follow the typical
7360 product detector circuit  that uses negative feedback.

Thanks!

Pete