I'm going to try these tubes again. The previous buyer said they did not work (the "87" one red plated). However, when I put the one back on my Jackson 658 tester the "94" tube tests out just fine. The "87" one is marginal but was good BEFORE the sale.
SO YOU ARE BUYING 1 TUBE (94) and the other (87) is so/so. If the "good" one does not work I will need a picture showing the results of your tube test.
Up for consideration are 2 - 7591 power pentode tubes. Both of the tubes have markings on the base which says "Made for McIntosh by Westinghouse". On the top of the tubes there is "7591 USA" markings. One tube has the marking "337 409 A J" whereas the other has the marking "34 32 72 A V". I have no idea what these markings represent. Manufacture date code?
The 7591 is a beam power pentode designed for use as an audio frequency power output tube. It has high power sensitivity and high efficiency and is especially designed for applications where high power output is required.
Both tubes were tested on a Jackson 658 tube tester (see photos). These tubes were also "Grid" tested for leakage (see photos) using the tube tester.
I will be happy to combine shipping on my other tube listings.
Both tubes will be carefully packaged and shipped in a cardboard box. Shipping will be via USPS Ground Advantage, FedEx, or UPS and cost $6.50