I was looking at the tube sellers ads regarding 7189/EL84/6BQ5 tubes.
They list this type of tube as being interchangeable. It seems to me that the 6BQ5/EL84 itself cannot handle the higher plate and screen voltages used in some 7189 designs. I'm just wondering if these foreign made tubes would stand up to this application. The left over US sourced 7189's are really high priced.
