The audio amplifier is based on Sziklai pair which has high gain and low distortion. About 2...3V of audio is needed at "CRR" for the full 100% modulation. Optimum voltage at "OSC" input is 10...15V. To adapt to a different input level, surface mount capacitors C4 and/or C5 (Fig. 6) may be changed on the circuit board.
In recent discussions with Jacob Roschy, it has become apparent how popular and versatile the ECH81 tube is. Jacob has used it in many of his transmitter and receiver designs. However, the extensive manufacturer's curves focus on the original intended application as Heptode-Mixer&Triode-Oscillator, or as Heptode RF amplifier.
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ECH81. Description. The ECH81 triode heptode was designed in 1954 for the role of frequency changer (mixer) in superhet receivers for AM reception. The ECH81 acting as oscillator and mixer for AM and the heptode being the first IF amplifier on FM. The two valve sections share a common cathode. The triode is to be used as the local oscillator ...
AV889 Tube Amplifier 200W+200W 2.0 Channel Bluetooth Rectifier WY2P 6U1 6A2 ECH81 Hifi Audio Amplifier. US $238.35 US $340.50. View Offer - 7%. 5.4w + 5.4w 6n2 Push 6P13P Tube Amplifier, Pure Bile Rectifier 6p13p Amplifier 6p13p Class A Single-ended Amplifier. US $96.38 US $103.63.
Sep 18, 2017 · The ECH81 acting as oscillator and mixer for AM and the heptode being the first IF amplifier on FM. The two valve sections share a common cathode. The triode is to be used as the local oscillator feeding the 13 Volts amplitude sine wave to the heptode mixer.
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Tubes were still cheap as AF amp and AM reception, but appearently, for the FM tuner, transistors were already better or cheaper. Read designer Rudolf Drabek about this. Around 2015, also the AM era ran to an end, so I wanted a small tubed radio with FM reception. The type shield mentions a power consumption of 30W, but the measured consumption ...
30 watts Idling 250 watts at rated power. Amplifier. RMS Power Per Channel. 75. Damping Factor @ Load Impedance. Greater tha 30 into 8 ohm load. Total Harmonic Distortion (THD) 0.1%. Power Bandwidth.
Portable audio amplifier, 10W output from 2 AD149'2, supply 230VAC or 12VDC, leather case ... last series before exclusive transistor versions using ECH81 EAF801 ...
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