Hi All, I recently acquired a stock X-100 that I'll be restoring. There are a bunch of X-100 threads, but sometimes they cause confusion because of the model variations. So to clarify, this is a serial# 32xxx with 7189/6BQ5 outputs and GZ34 tube rectification. Obvious initial safety measures are installation of a CL-80 thermistor & replacement of all electrolytics. 1. Are there any other recommended restorations/upgrades for this model (besides coupling caps & IBAM)? 2. I know the power transformers on the X-100 are prone to failure. What is the typical cause of PT failure on the X-100, and on which models is it more of a concern? 3. What is the definitive answer on using 6BQ5 vs 7189s in the output stage? With the schematic showing 380v on the plates, I'm assuming 7189s are the safer bet, but quality NOS are getting scarce. I'm using NOS Teles for V1/V6, RCAs for V2/V7, GEs for V3/V8, slightly used Mullard GZ34, and a matched quad of NOS Reflector 7189/6BQ5s. I'd like to keep my unit as stock as possible for now, with possible upgrades in the future after I've lived with her for a while and know how she sounds. Thanks!