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Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family
Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family

Philips 5691 Ruggedized Military Tube Pair - Testing a Bit Low - 6SL7 Family

$ 34.32

  • Brand: Philips
  • Country/Region of Manufacture: United States
  • Model: 5691/6SL7
  • Seller Notes: “Testing Marginal”
  • Type: Vacuum Tube

Description

Up for sale, a pair of Philips 5691 ruggedized tubes. This pair tests a bit marginal and may not provide a lot of life at this stage. These have multiple support rods and are a true 5691 tube. Test results are shown. Listed for parts/repair as I have not personally listened to them in a circuit and they are approaching the end of their useful life. This is a sub for the 6SL7 family as I'm sure a reader of this listing will know. My test rig is shown below for reference. I feed the tester with 116.4V sine power (my wall voltage is all over the map, frequently approaching 130V in the summer months). This allows for absolute consistency with testing and/or matching. All tests are run in Fixed Bias mode which produces the most conservative numbers. These will ship in non-original boxes. Listing is for the pair. US bidders/buyers only please. These will ship tracked and insured.