I have an old 30L1, which has been in and out of use here for some time. It
has also been the cite of several interesting ( and not always successful!)
enhancements. I found it quite easy to modify the meter circuitry to read grid
current, in place of the infamous 'TUNE' position. This, along with a wattmeter
in the feedline, makes it possible to quickly and easily get it optimized at
full output without hosing the 811A (or 572) grids. If you are interested, drop
me a line and I will send a copy of the page in my lab notebook which
documents this, as well as data for conversion to 572's for 1KW+ output.
Eric von Valtier K8LV
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