Notes on Commander HF-2500 Amplifier

27 August 2021

Donated by Jason Joens, NR0X and picked up in Martelle, Iowa, August 27 by W0CG and Dorothy.

23 September 2021

Following disassembly and packing of transformer and tubes, shipped via Tallmadge Fed EX to Curacao.

4 November 2021

In service at Station 1 for testing and tuneup. 2000 watts out on 80 Ridge blew out an N barrel in the backyard buried part of the feedline.

9 November 2021

Finalized draft tuneup sheet. Tuning is very critical and the amp folds back power when it does not like the SWR or grid current.

November 2023

Used successfully for about half of CQWW CW. During CQWW CW amp ran extremely hot on 10 meters. Removed from service.

25 January 2024

Installed two new (to us) 3CPX800A7 tubes bought from K3AC. Did 18 hours of filaments only as gettering. Ran some QSOs at 300 watts out on 20 meters and amp got very hot. Blower is caked with dust.