Tube based headphone amplifier 12AU7 kit test & review

Design Your Own Tube Preamp

12AX7 stereo tube preamp only 12 volts

Poniendo a punto un viejo Icom IC 720A

China Moon Landing (the full video)

LIVE NASA BR / A Terra Vista Do Espaço (oficial)™ - Car In Space - View...

Hubble Space Telescope : The Wonders Of The Universe - NASA Hubble Teles...

Two Six Pac's On The Bench

Propagación en 10 metros FM-AM.

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REPETIDORA FM EM 10 METROS EM NOVA YORQUE

ANTENA ELECTRIL 3DX3

FAIXA DE 10 METROS

YAESU Linear Amp FL-2100B

Reparacion e instalacion de salida FI en Yaesu FT 747GX

Introduction to Amateur Radio

Introduction to the 10 meter amateur radio band

HAM RADIO SWAN 700-CX

sb 221 for big rob