[MRCA] ART-13 811A vs 572B

[doran platt]

Is there any reason one cannot substitute decent 572B tubes for the 811A 
modulator tubes in the ART-13?   The form, fit, and specs are all OK.  I 
firmly believe they will work just fine but  are any different 
opinions?  The only reason I ask is that when I recently divested my 
large stock of tubes, I failed to retain any 811As as spares.  I do have 
spare 572Bs, however, as used in my AL-572 and SB-200 amplifiers.  TNX

Jeep K3HVG
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