Here are the essential specifications for the stock unit:
Peavey uses a stack of standard M6-grade (or equivalent) laminations, about . The core is EI-75 size (approx. 1.9” wide center leg). The winding is basic interleaved (primary-secondary-primary) – not the complex multi-interleave found in a high-end Hi-Fi transformer. This is why the stock OT has good midrange punch but lacks extreme low-end clarity and has a high-frequency roll-off around 8-10kHz (contributing to the “dark” or “ice pick” character depending on the speaker). peavey classic 30 output transformer specs
