For sale is this new Stancor TA-17 audio transformer about 2.5 x 2.75 x 3"

marked 8 ohms CT (that is like 4 or 8 ohms) to

5000 or 7500 ohm (5K or 7.5K 120ma).  They call the 5-7.5K a secondary, but you can use this backwards with single ended triodes,

something like an SV572 is high voltage maybe 1000V but usually less than 120ma, and can single ended output about 35 watts.