I made the following updates in Summer 2018:

• I removed the large bias pots and implemented Dave Gillespie's Enhanced Feedback Bias (EFB). The schematic for the project has been updated to reflect this.
• As a part of this effort, I made an outlet box with a transformer inside that reduces the wall voltage by ~7 VAC in order to bring down the heater and B+ voltages to reasonable levels.

I made the following updates in Summer 2020:

• Replaced LED with Bivar MPC5ADW6.0 and 820 ohm (I think) resistor
• Replaced power entry jack with Schurter 5120.0303.0 PEM filter
• Removed volume control
• Moved bias select switch from back to front (where volume control used to be)
• Replaced signal wire with Mogami W2330