This is the BAMA archive. These manuals are available for download and free of charge.
These Bulletins came with my Hickok 533. T-101 and T-103 probably also apply to the 532, 533DM, 534A, 534B, and 600 testers. T-105 should apply to any Hickok with a bias fuse lamp. T-127 has supplementary data for all of the 500-and 600-series testers. Compliments of Dale Cook.