Product Description
A closely matched pair of very rare National Union 6113 dual triode vacuum tubes-fully tested. These are a black glass, low noise, low microphonic version of the 6SL7GT produced in early 1950s. One tests 1204/1110 uMhos, the other 1176/1176 uMhos with baseline acceptable of 700 uMhos. Tested on Hickok AN/USM-118B tube tester. Will be packaged in white tube boxes.
