No.071 - HP 6611C Linear Bench Power Supply Repair

In this video series I repair an HP 6611C Linear Bench PSU. Update - Accuracy info: Remembering it's a System Power Supply and not really meant as a general bench unit, the accuracy comes when using the rear phoenix terminals and the sense terminals there. I tested them and even with a 5A load @5Vdc the output only dropped by about 0.5mV. The user manual states "Front binding posts are provided for convenience. Only the rear panel terminals are optimized for noise, regulation, and transient response as documented in Appendix A2". Without opening it up again, I can only assume the 'local' mode sense connections don't go all the way to the back of the front binding posts, and probably the gauge of the wire there is questionable also.......and thus volt drop is experienced even with minimal loads. If I was keeping the PSU I'd probably modify it for that.....an easy mod to make. It's for sale!....UK only: https://www.ebay.co.uk/itm/143963351349 - NOW SOLD Other HP/Agilent PSU repairs: Agilent E3631A Part 1 -    • No.068 - Agilent E3631A Power Supply Repai...   Agilent E3632A Part 1 here =    • No.064 - Agilent E3632A Power Supply Repai...   Part 2 here =    • No.065 - Agilent E3632A Power Supply Repai...   Part 3 here =    • No.066 - Agilent E3632A Power Supply Repai...   Part 4 here =    • No.067 - Agilent E3632A PSU Repair - Part 4   Visit my website for lots more - https://www.ianjohnston.com Help me make more of these videos: Pledge using Patreon -   / iansjohnston   Donate using PayPal - https://www.paypal.me/IanSJohnston