Yes, the AGC problem was still there and AC hum was present in the audio. I hooked it up to a vintage Jensen 10" speaker with matching transformer to the 600 ohm audio out. I fired the SP-600 up for the first time in decades by using a variac. The radio features the metal (not paper) faced Marion Electric meter and the black dial escutcheons are the later type with no fasteners visible from the front. This is a very nice SP-600 in excellent cosmetic condition. 191XX) means that the dreaded black beauty molded capacitors were never installed and that ceramic disc capacitors were used instead. In addition, the fairly late date of production (serial no. The XTAL calibrator also brought the tube count up from the typical 20 to 21. It turns out that this JX-21 was built in 1956 (date on original filter cap can) or 1957 (a factory installed Hammarlund XC-100 100 kHz crystal calibrator is present). This summer I hefted the SP-600 out of storage and took a good look at it. Then I had a long career and raised a family. I mothballed the radio and put it in storage. I used it for a few years but had AGC issues with it. Back then tube gear was getting unloaded for a song. I purchased a lightly used Hammarlund SP-600 JX-21 in the early 1980's from a local military/government surplus electronics store in California. Doesn't mean its not usable there, but the freq readings will be poor. The only negative I've noticed is the ham bands are There is a lot of good restorationĭocumentation on the net. Have one of the smoothest tuning receivers made andĪ real joy. A complete tearĭown is necessary and not that bad. That usually needs attention is the dial system.Īdding oil won't help if the dials slip. Not something you want to do twice! Another area I've had a few fail and removing the RF deck is In there I'd suggest replacing the smaller value mic capsĪs well. The most difficult to get to are in the RF deck. But most will haveįailing (split cased) black beauty caps and these will all Looking for one, the best and easiest to restore are those with ceramic bypass caps.
They all needed to be restored electrically. Mine range from an JX (no suffix) to a few JX-21's. The SP-600 was one of the last older generation superhet.
Radios of the same vintage that are better (Collins), but Its still one of my faves for s/w listening. Took many years to find my first one (now have 6) but Its performance blew my socks off and still does. The very first high performance receiver I ever saw asĪ kid in the mid 1960's was an SP-600 an older ham had.
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