Offering a full output, matched pair of Eimac 3-500's. Tested in a Henry 2K4 and making 1600W output with 100w of drive and 3KV plate voltage. Tubes were OEM in a Henry 2K4 (date coded 1974) recently purchased for an 8877 retrofit. Filaments are bright and the tubes function to new tube specifications. $300+shipping Ron W2CQM/3