[Hallicrafters] AC/DC Set Alignment Questions

[Kenneth Goodwin]

For an alignment of an ac/dc set like the S-38D, I know enough to have the
receiver on an isolation transformer.  However,

1.        Would you put all of the test instruments (VTVM, Signal Generator)
on the same isolation circuit transformer.  All of the test instruments have
a 3-prong AC plug.  It has been my practice to put those on a two prong
interface device (whatever those plugs are called).

2.       I would presume that for the alignment of the I.F. having nothing
connected to the antenna connection is standard.

3.       I have a Hickok 6000A tube tester.  All the tubes normally have a
Shunt setting for testing as shown in the test data manuals and/or the tube
tester's scroll.  The Hickok manual says the meter is only reading true
micromhos when set to one of the three calibration marks on the Shunt dial.
Each of these three marks is associated with each of the three scales on the
tube tester meter.  The tube data tables show a 'passing' Mutual Conductance
parameter.  Is that the reading when the Shunt is set to the tube table
shunt value which is different than the meter calibration setting?  If so,
what scale of the three meter scales do you read?  The scale closest to the
mutual conductance number given in the tube test data?  Or is the mutual
conductance parameter in the tube tables only valid when the shunt is set to
one of the three calibration marks on the shunt dial?

4.       Isn't a simple capacitor across the antenna connections good enough
for a dummy load?  The RTMA model shown in the Halllicrafters manual is made
up of no less than four  R/L/C devices. 

 

Ken K5RG (krgoodwin at comcast.net)