John Kogel Posted August 28, 2011 Report Share Posted August 28, 2011 ... they can get very hot. Plate voltage is often over 350 volts DC. I was browsing thru some old pic files and found these pics of a pair of 6CA7 power tubes on the verge of meltdown. My nephew brought over this Traynor amp, vintage 1973. It was behaving badly, sometimes, not all the time. Thumping it with a fist wasn't working anymore. [] It was fun for a few days, because the problem was intermittent. It sat on the bench for a whole day and did nothing. then when I flipped the chassis over one time, I got this redplate reaction. And captured it for my files. A new matched set of Russian power tubes was all it needed. Click to Enlarge 31.64 KB Click to Enlarge 33.66 KB Quote Link to comment Share on other sites More sharing options...
Marc Posted August 28, 2011 Report Share Posted August 28, 2011 Brings back memories from my days as a radio/tv tech. Marc Quote Link to comment Share on other sites More sharing options...
Les Posted August 28, 2011 Report Share Posted August 28, 2011 Click to Enlarge 31.17 KB Click to Enlarge 26.39 KB can't even give these treasures away! Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted August 28, 2011 Report Share Posted August 28, 2011 Apparently the reaction was strong enough to affect the autofocus on your camera. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted August 29, 2011 Author Report Share Posted August 29, 2011 Apparently the reaction was strong enough to affect the autofocus on your camera. I think I turned off the flash for those shots, so with a cheap camera, the longer exposure makes a fuzzy pic. I'm obviously no photographer. Les, that Philco Admiral, thanks, Marc, has some value to somebody. The round picture tube makes it collectable. No, thanks, I'm not interested. [] A few years back, it was a fad to convert the old Futura TV's into computer monitors. Sacrilege! Quote Link to comment Share on other sites More sharing options...
Marc Posted August 29, 2011 Report Share Posted August 29, 2011 Les, that Philco has some value to somebody. The round picture tube makes it collectable. No, thanks, I'm not interested. [] A few years back, it was a fad to convert the old Futura TV's into computer monitors. Sacrilege! I thought it was an Admiral. The 2nd one an RCA. Les? Marc Quote Link to comment Share on other sites More sharing options...
Les Posted August 29, 2011 Report Share Posted August 29, 2011 Admiral and RCA Quote Link to comment Share on other sites More sharing options...
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