>
>> The problem with a 50w zener is that its Vz is not adjustable. A
>> fwd-biased Si diode string can be adjusted by changing taps.
>
>I never found it necessary to "adjust" the bias. I use 50 watt zeners
>to obtain the correct ZSAC, and it stays there. I use 8 volt units for
>an 8877 with 2500-3000 volts Ep and a 12 volt unit for 4kv Ep. If I
>want to cut ambient heat when on CW, I just switch to another 50 watt
>zener of the proper value to lower the ZSAC to an appropriate value.
>
>IMO, "strings" of components, marginal tank components, non-RF rated
>capacitors, and 3-4 tubes are only found in amateur equipment.
>
Henry Radio Co uses fwd bias diodes to set fil-cathode bias in it's
amplifiers.
Is there a zener made that can take a 400A glitch?
>To each his own; I am just not a "Rube Goldberg" type when it comes
>to amp building!
>
>(((73)))
>Phil, K5PC
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
|