Using old tubes for sale on Ebay. Some tube might be microphonic or noisy or noisy plate resistors. Checked the filter caps with a capacitor analyzer and brought up the voltage slowly. Playing it using the phono input with a computer and a guitar speaker cab. 7027 push-pull, 4xEF86, 3x6SN7, 2x7027A, 1xOD3 voltage regulator. I couldn't find a OD3, so it is a OC3w in the video. The video is made using an iPhone 8. Thank you for looking!
