If you have 572Bs they are plug and play subs for 811s - just have a hjgher plate dissipation rating.  I’ve been running a pair of them in my ART-13, removed from my OOC SB-200 amp since I lost an 811 snd didn’t have a spare at the time.

73 de Chris AJ1G

Sent from my iPhone

On Sep 15, 2025, at 22:51, B. Smith via MRCA <[email protected]> wrote:

 I was running short of 811s and operate primarily CW.
Subbed light bulbs for the tubes to keep the 813 lit.
k4che
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http://k4che.com/ART-13%20WO%20811s/ART-13%20Without%20811%27s.htm

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<bulb sub.JPG>
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