Never got through directly to Leben but the dealer confirmed the 5852 is an acceptable replacement in the RS30-EQ. Thought I'd wrap this up in case anyone else is curious.
Check with Leben to see if the Bendix 5852 is a recommended replacement. The 5852 draws twice the filament current (1.2A vs .6A for the 6X5). I found the Bendix 5852 to work very well in my Audio Note Kits L3 pre-amp. Give it a couple of minutes of warm up time or you will hear some buzzing.
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