[Hammarlund] HQ-129x IF alignment

[William A Kulze]

Hi, Carl

Now, the one I have was definitely not the one my dad had, but he lived in merrick at the time of the qsl, and was living in Poughkeepsie and about to move upstate at the time you bought yours. Be funny if you got his old one! Odds are pretty slim, I know.

Look at the pic I have on qrz. If you 'control/mousewheel' you can zoom in (ctrl/0 to go back to original). The picture actually has enough resolution to do this. You can see the switch and label. The unit itself is mounted in the back corner of the chassis on that same side. And you can see that it's a 'red letter' model. The cal osc is definitely later production, it uses a miniature tube.

I got mine from a local ham who got it from an SK estate, which was supposed to be the original owner.

One question I have, can you sub the 6SG7 for the 6SS7 with no changes? The schematic shows only the 1st and 3rd IF tubes have pin 3 tied directly to pin 5. The RF tube has pin 3 grounded and the 2nd IF has 390 ohms between the two. The tube data sheet shows these tied internally.

Secondly, I mainly use the radio below 20 MHz. Will I see enough difference to bother, or will this mainly increase sensitivity on 10 and 15?

Bill W2NVD


-----Original Message-----

Hmmm, I bought a HQ-129X used in 1956 thru an ad on the wall at Harrison Radio in NYC, I lived on LI back then. It had the calibrator factory installed according to the 1953 BOS that was included making it one of the last runs before the 140.

The switch was in the same position but no added label.

Ive not seen another like it and it would be something if yours is the same one. I sold it in 1968 or so and shipped to Indiana from NH.

Carl
KM1H