[Boatanchors] B&W 5100 xmtr

[Glen Zook]

I know that the B&W 5100 manual says 17 mA for the
grid drive of the pair of 6146 tubes.  However, is
this the "true" reading or what the meter reads?

If it is a "true" reading, the 6146 grids are being
very overdriven.  The maximum grid current for a
single 6146 is 3 mA (6 mA for a pair) and they will
last much longer at 2.5 mA each (5 mA per pair).  The
3 mA is per RCA specifications.  Running a pair of
6146 tubes at 17 mA grid drive will reduce the life by
up to a factor of 10!

I am wondering if the fact that the maximum
calibration in the "grid" position is 40 that the 17
reading is relative (even though the manual says 40
mA).

Glen, K9STH


--- Al Klase <skywaves@bw.webex.net> wrote:

You want to see 17 mils of grid drive and load the
plate to a max of 220 mills, per the manual.  I think
that's all we need to know.

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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