On Mar 6, 1:40*pm, Hank wrote:
I am restoring an old Hallicrafters SX-28 and have one remaining issue
that I need to resolve -- poor sensitivity on the upper bands, which
appears to be related to very poor signal transfer from the antenna to
the grid of the first RF amplifier tube. IF stages appear to be
functioning well. *I have signal voltage readings (oscilloscope) for
all of the inputs and outputs from the antenna to the output of the
mixer, but have no baseline to which I can compare my readings.

If someone is familiar with the SX-28 and the relative signal
intensities that I should be seeing at the various RF stages, please
contact me via e-mail so that I can discuss this.

Thank you!!

Is the oscillator voltage holding up on the higher bands? Check the
self-generated oscillator tube grid bias voltage with a high-
impedance, low capacitance probe to a VTVM or DMM on DC volts range.
Compare measurement to that on the lower bands.
Cheers,
Roger