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Boffin's blog

tubes, amps and more…

  • Tube Amps
    • ESP32 Squeeze-lite
    • DHT Filament Heaters
    • 300B SE
    • KT88 SE UL
    • 2A3 SE
    • 1626 PSE
    • 1625 PP
    • Dynaco 6V6 Push-Pull
    • Transformers
    • Tubes
  • Digital
    • FPGA
    • FPGA THD Analyzer
  • Measurements
    • DIY Curve Tracer
    • uTracer3+
    • uTracer and ESP32
    • uTracerJS
    • ESP32 Spectrum Analyzer
    • Cap Leakage Tester
    • CircuitGear Mini
  • 8Bit
    • GAL Programmer (Arduino)
    • EPROM Programmer (Arduino)
    • Commodore C64
    • 1541-II
    • 1541C
    • Pi1541
    • ZX Spectrum 48k
    • ZX Spectrum 128k
    • ZX81
    • ZX DivIDE
    • ZX AY-3-8910 Sound
    • ZX Spectrum external 128k RAM upgrade
    • ZX Spectrum Links
  • Other
    • 8 Ohm Dummy Load
    • NIKKO TRM 40LA
    • Transistor Tester (MTester)
    • Ducky One Keyboard
  • About

300B SE

Recent Posts

  • ZX DivIDE
  • ZX 128k
  • Notes on power supplies and tube rectifiers
  • Notes on Output Transformers

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