[HBR] Fwd: GB>HBR-16 PRODUCT DETECTOR

[Garey Barrell]

Reposted with permission...




>Hello all,
>
>I ran across an interesting note in the hints and kinks section of Jun
>62 QST.
>
>It was submitted by W6TC and endorses the use of a 6BY6 as a replacement
>for the 6BE6 in the product detector.
>
>The 6BY6 is capable of handling significantly larger signal voltages
>without distortion. Ted writes that there isn't any distortion on SSB
>signals even when their strength is such as to pin the S-meter to where
>it doesn't drop back during normal no-modulation intervals.
>
>The 6BY6 is pin compatible with the 6BE6.  The only circuit
>modifications are a change in input capacitor to 5pf, change of plate
>resistor to 33k, change of screen droping resistor to 33k, and change of
>cathode resistor to 330 ohms.
>
>The improvement in performance is touted to be significant enough to be
>noticed without need for sophisticated test equipment.
>
>I have not tried this modification myself and was wondering if anyone
>has tried this.
>
>Also, if it works for the product detector, it would probably also work
>for circuits using the 6BE6 as a mixer.  After all, a product detector
>is a mixer.
>
>Regards,
>Frank Kamp
>K5DKZ