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The U4 chassis also used the 21ESP4 and has 2kV more HV. The U4 also has a 6AQ5 for video amp and other differences. Both M4 U4 have taps on G2 for focusing
The G3 voltage (boost) for M4/21DEP4 is 310 while the U4/21ESP4 is 590.
I have a sams substitution book, but the 21DEP4 has a few subs but not the 21ESP4, The 21DEP4 shows only one sub..
Last edited by DavGoodlin; 02-23-2013 at 10:38 AM.
Reason: G2 add
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