Lafayette HA55A, Air band Receiver

                                                                     Lafayette HA55A

A 1960’s Air band receiver

This was one of my few encounters with a Nuvistor 6CW4 in the front end

The set now works however I have noted a few issues with regards to its original specification

Tuning range 108 –136 Mhz

See below

Sensitivity 4uV

Even with a Nuvistor the 4uV is quite poor

Image ratio 40dB

Actually the set suffers from poor image rejection and one can receive a range of Band 2 Broadcast stations which can swamp the receiver

The set does use a strange selection of valves even for the 1960’s,

Apart from the above negatives the radio receives Birmingham very well

HA55A Circuit Schematic 

HA55A Alignment 

Hope this helps