 Hammarlund
HQ-140-X (circa 1953-1956)
 <under construction>
Many thanks to my interesting friend and ARRL life member John.T.Jensen for the generous
donation of this receiver he had owned for 30 odd years.. The
Hammarlund HQ-140-X is a single conversion general coverage receiver
covering 0.54 to 31 MHz in 6 bands with calibrated bandspread on four
amateur 80,40,20,15 and 10 meter bands. It is
equipped with a Lamb single crystal i/f filter, avc, noise limiter and
antenna compensator.
click images to zoom in
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After a thorough but careful water blasting and hot airgun dry it was
up on the workbench... After inspection I changed the rectifier back to
stock 5U4 tube setup from diodes replaced along its 50 year lifetime,
replaced line cord, removed a non stock wave trap, changed 6L6
back to 6V6 and re-biased replacing 10uf audio cap and 360k
dropper, both physically obvious faults, I changed filter electrolytic can, fixed intermittent fused holder
connection , cleaned all
pots, tube sockets, switches and wafers, rust proofed cabinet, painted tranny, replaced
a non oem audio transformer with the correct one. After all
voltages were bought back within spec by replacing out of tolerance R's
& C's all tubes were replaced with new ones
except for OC3 (105v reg). After a good lubrication to tuning gears and
graphite grease on vane fingers, and
a thorough warm-up, the i/f, r/f and osc were carefully re-aligned on all bands and
bandspread calibration checked. Lastly S-meter was calibrated , new #47
pilot bulbs fitted then LOTS of
cosmetic stuff I wont bore you with but suffice to say the tropics where
it was operated (Yap, where, go look it up!) was somewhat unkind and 21
yrs of storage probably didn't help either.
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Nammarlund HQ-140-x Sales brochure (thanks to
http://www.hammarlund.info)
   
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Hammarlund HQ-140-X QRG Spec sheet
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| Service manual and schematics are available from the Manual Download
Repository here |
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