>
>At 06:10 PM 6/11/98 -0700, you wrote:
>>
>>Gents,
>>Looking for a "standard" to go by in regards to the Ip to Ig ratio of the
>>older triodes, ie 572B, 811A, 3-500Z, etc.
>>
>>Is there such a thing??
>>
>>Can't find any published data/specs on the 572B Ig and apparently Eimac did
>>not publish and "max Ig" rating for their 3-500Z.
>
>
>Lane
>
>I have designed and built 3-500Z HF Amplifiers. And while it was some years
>ago, 18 to exact, I recall that the max grid current rating was 130ma per
>tube.
Not on the Eimac 3-500Z. spec sheet. Not on the Amperex 3-500Z spec
sheet.
>And it was pretty easy to toast a grid. Tune up procedures for
>amplifiers with PI-L tank circuits as opposed to PI were very pointed. Tune
>the Loading capactor FIRST lest you fry the grids. If the loading is
>coupled too tightly with the Tuning Cap out the grid current will soar.
>
>Bob K1TA
>
>
>--
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>
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
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Search: http://www.contesting.com/km9p/search.htm
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