>
>
>> How useful is a bias voltage that wanders with temperature?
>>
>> If you have 10 diodes to get about 7 volts, that will reduce by over
>> 1/4 volt for a 20 degree rise.
>>
>> Of course, the ZSAC may be so non critical that it doesn't matter on
>> 3-500Zs, but if you're going to start pushing the output power,
>> carfeul selection of the right zeners could help.
>>
>> After all, it's only a relatively few dollars for a number of big
>> zeners - a lot more for the tubes. even less with 1 watt zeners and a
>> 2N3055 or similar beefy transistor.
>
>Peter,
>
>Rich suggests series rectifiers as zeners. Like with neutralization
>or parasitics, nothing else in the world except his exact ideas are
>acceptable.
How many "neutralized" G-G amplifiers did ETO/Alpha manufacture?
How many "neutralized" G-G amplifiers did Henry Radio manufacture?
How many "neutralized" G-G amplifiers did Collins Radio manufacture?
Why did Heath discontinue the "neutralized" Warrior and introduce the
unneutralized SB-200?
>
>It doesn't matter if the regulation is worse with temperature, or if the
>bias voltage wanders around with current, as long as you follow his
>commands.
>
sounds like Jon Ogden
>
>73, Tom W8JI
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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