Cetron 572B T160L Vintage 1979 Power Tube Quad (set of four NOS matched tubes)
NOS spec is around 55. These test very well at 56.0, 56.1, 52.0, and 54.5 (plate current of 6.2, 6.2, 5.7, and 6.1). WHAT'S INCLUDED IN THE SALE: You will only receive what is shown in the photographs.