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12SQ7 glass versus metal, any difference for Hallicrafters Continentalshorwave radio?
I am looking to replace a sylvania 12sq7GT that I dropped (!*#%$!) on
the floor when cleaning my Hallicrafters Continental Shortwave Radio. The diagram on the bottom of the radio shows the tube that should be in there to be a 12SQ7 with no mention of GT (that means glass tube right?) The tube I broke was working without flaw and I would like to replace but I see there are the metal enclosed military type tubes as well. Without getting too technical can anybody let me know which types or brands are best for a am/shortwave radio? Please post advice. Regards, malomarski |
#2
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"O. Alvarez" wrote in message .. . I am looking to replace a sylvania 12sq7GT that I dropped (!*#%$!) on the floor when cleaning my Hallicrafters Continental Shortwave Radio. The diagram on the bottom of the radio shows the tube that should be in there to be a 12SQ7 with no mention of GT (that means glass tube right?) It probably originally came with a metal 12SQ7. GT as glass tube is close enough. There's a whole bunch of tube suffixes. The tube I broke was working without flaw and I would like to replace but I see there are the metal enclosed military type tubes as well. The metal tubes were designed by GE and RCA in the mid 30s as a way to make more compact and rugged tubes. The metal tubes were also the first series of tubes with octal bases. They aren't specifically military, although the military bought millions of them in the WW2 and Korean war eras. Threre's a good chance your replacement tube will come from this surplus hoard. Without getting too technical can anybody let me know which types or brands are best for a am/shortwave radio? The GTs were designed to interchange with the metal tubes. They are slightly larger, which is hardly ever a problem. It won't be a problem in your radio. Either series of tube is much smaller than the older, light bulb sized S/ST types. Don't worry about the tube's brand. They are all pretty much the same. There's no guarantee that any tube was made by the labeled company, anyway. Tube manufacturers specialized in certain tubes, and they sold them to other companies. Please post advice. Regards, malomarski Buying new tubes is mostly a mail order/internet business now. I've had good results with Antique Electronics Supply, Fair Radio Sales, ESRC, Brent Jessee and others. I also like to stock up on used tubes at hamfests. Used tubes are usually a very good deal. One easy way to find tube vendors is to enter the tube's number into a search engine such as google. The vendor's price list's are easy to pick out. Frank Dresser |
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