Up for sale, 9 used 5687-type tubes. All are made in USA, ca. 1960s, and have long 17mm plates. Similar but not identical construction. It's a mix of assorted tubes and I only keep the highest testing. Black and 'bronze' plates. Some are missing some print. See the pictures. I got these for a preamp but now don't need them. Details below:
Tested on my calibrated Hickok 539C tester. Some test as NOS.
All show 8200 to 9200 gm (4800 min), and w/ current 16-23 mA (with one T-S exception).
4 GE - 1 is JAN 5687WA; another is a Tung-Sol overprinted GE. also 5-star.
2 RCA - 1 has bronze-y plates.
1 Raytheon- bronze plates.
1 Sylvania - JHS 5687WA.
1 Tung-Sol, this one tests a little lower than others but it's a 1958 bronze plate.
These all came from the collection of a retired telecommunications engineer I knew. The set may be useful to an audio enthusiast or commercial dealer.
Buyer will receive 9 tubes, and 6 boxes as shown. Returns allowed but must return all, no partial refunds. Will be well-packed and shipped within US, $3 by US Postal. Much more for overseas mail. See my other tubes and thanks for looking.