• Country
• United States of America (USA)

• Manufacturer / Brand
• Ehrhorn Technological Operations Inc.; Colorado Springs, CO

• Year
• 1990

• Category
• RF (Radio Frequency-) Amplifier

• Radiomuseum.org ID
• 278885

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 1

• Valves / Tubes
• 8877

• Number of Transistors
• 16

• Semiconductors
• 2N3904 MJE802 2N3904 2N3904 2N3904 2N3904 2N6027 MFE121 or. MPF122 2N5061 MJE802 2N3904 2N3904 2N3904 2N3904 2N3904 2N3904

• Wave bands
• Short Wave (SW only)

• Power type and voltage
• Alternating Current supply (AC) / 220 - 250 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: Alpha 77 DX [PA77-DF, PA77-Dx,Alpha77 Sx] - Ehrhorn Technological

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 480 x 280 x 560 mm / 18.9 x 11 x 22 inch

• Notes

• Frequency Coverage : 1.8-2.0 and 3-24 MHz (24~30 MHz, PA-77Dx only)

  Plate Power Input : PA-77DF 2.5 KW PEP/SSB, 1 KW average d-c, all modes, no time .limit; PA-77Dx 3.5 KW PEP, 2 KW d-c average

  For export only, Model Alpha  77Sx (PA-77Sx): Same as ALPHA 77Dx (PA-77Dx) above except two 8877 tubes permit greater PEP input and output power. Approximately 175 watts drive for maximum output.

  Cooling« Full-cabinet ducted forced airi ball bearing centrif. blower

• Net weight (2.2 lb = 1 kg)
• 48 kg / 105 lb 11.6 oz (105.727 lb)

• Author
• Model page created by Jean-Luc Potart. See "Data change" for further contributors.

• Other Models

• Here you find 9 models, 9 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ehrhorn Technological Operations Inc.; Colorado Springs, CO