[ARC5] RBB-6 Questions

Mark K3MSB mark.k3msb at gmail.com
Wed Mar 13 23:05:02 EDT 2019


Hello Gang

I'm working on my RBB-6 and am using NAVSHIPS 91469  dated 2 July 1951.

I have two questions.

Question #1:

In Figure 7-29  "RBB-Oscillator Box, Connection diagram"  should E122 be
E-119 as shown in FIgure 7-11 "RBB Terminal Board Identification" ?

Measuring from (what I think should be) E-119 Terminal 3 to V103-6 gives me
the expected reading for R115 + R126.

Question #2:

Tube Socket Resistances   Table 7-9.

I'm getting very different readings  for V308 Pins 4,5,6, and 8.

For example,  Pin5 in the MOD position:   my manual says 950 ohms.  I
measured 3900,  and that agrees with what I find when tracing the schematic.

Here's what my manual says:

V308-4:   50K in both CW-OL and MOD
V308-5:    3900 (CW-OL)   950  (MOD)
V308-6:   2.2M  CW-OL    500K  (MOD)
V308-8:    500K (CW-OL)   120K (MOD)

Do any of you have a manual that shows differently?

73 Mark K3MSB
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