- Vintage Tube Radio's from Germany for sale. High class restorations for all valve radios offered. Radio Brands like Saba, NordMende, Majestic, Grundig, Zenith, Philco and more. TubeRadioDoc Vintage Audio Store
California Tube Laboratory
- CTL designs and manufactures a wide range of high-power pulse and CW magnetrons, and provides cost-effective magnetron rebuild services for commercial, industrial and defense users.
Ameritron AL-811H Tuning
- Ameritron Al-811H Tuning for Power/Dissipation/Linearity, and More Generally 811A Tube Amps in Grounded Grid
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Ameritron AL-811H tube selection
- This article examines the performance of the Ameritron AL-811H amplifier with the supplied 811A tubes and with 572B tubes, and details a procedure for replacement of existing tubes.
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- Ameritron AL-811H Amplifier inside 800 Watt PA modified with 4x 572b tubes