Tube & Tube Tester Recommendations?

[DavidC]

I am starting the process of going through my BA's.

I need your good counsel on tube substitutions and a decent
inexpensive and reliable tube tester.

A specific question: Are a pair of 6L6's a good swap for the 5881
modulator pair in the Elmac AF-67?

Here are the rigs and their tube lists.  Any good hollow state or SS
subs jump out at anyone?

R-392
--------
6AJ5
12AU7
26A6
26A7/GT
26C6
26D6


Morrow pair
-----------------
6AQ5
6AL5
6BE6
6BJ6
6BZ6
6C4
6T8
12AT7
12AX7

Elmac AF-67
--------------------

6AK6
6AG5
6AQ5
6AU6
6BJ6
12AU7
5881
6146
OB2

Elmac PMR-6
---------------------

6AL5
6BA6
6BA7
6BE6
6BJ6
6BK5
6C4
12AT7
OB2

M-1070 PS
----------------

OB2

- Thanks! & 73, DavidC  K1YP

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