811 vs. 572 tubes

Sparkmuseum - Vintage radio and scientific apparatus by john jenkins, include antique radios, Horn Loudspeakers, Vacuum Tubes, A.C. Receivers

ACOM 1000 tube replacement - Step by step instruction on replacing tubes on the ACOM 1000 RF Amplifier

ACOM-1000 Contitioning tubes - Conditioning NOS GU74b Tubes in your ACOM-1000 Amplifier by VE1DX

Alpha 9500 vs. Acom 2000A - QRZ forum thread on Alpha 9500 vs. Acom 2000A

AL-811 Modification - Ametiron AL 811 mod with pictures

Yaesu FL-2100 linear amplifier - Repairing a Yaesu FL-2100 having both the 572b failed

Yaesu FL2100Z operating tips - The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.

Yaesu.com : FT DX 3000D - Official page at Yaesu website of the Yaesu FT DX 3000D HF transceiver

Hy-Gain TH3JRS vs. Cushcraft MA5B - QRZ forum threan on Cushcraft MA5B vs Hy-Gain TH3JRS

Metal Depot - US based aluminim supplier, a supplier of aluminum, and stainless steel rods, tubes, and bars useful for antenna parts

WVS Technology - RF Tubes shop, capacitos, inductors and more electronic components dealer based in Germany

Homebrew a 3 Tube GI-7B-T HF Amplifier - Build a 3 tube, GI-7B-T amplifier using an old prototype box that was meant for 4, 572-B

811 Linear Amplifier project - A lower power desktop linear with integrated 120vac power supply. This, very compact, dual 811 version will deliver about 300 watts output. Covers all bands including WARC bands.

Arcing or Gassy 572B Tube - Common problems of the 572B tubes often used in many RF Power Amplifiers