811a Output Transformer, The 811A’s are instantly heated; thus, there is no delay in warm-up. Ameritron AL-811 amplifiers are excellent for the newcomer because they're tough enough to withstand momentary mis-tuning. P. Never connect the amplifier to power lines with the cover removed If fuse blowing continues, remove both transformer HV secondary leads (normally red leads) going to the HV rectifiers and/or center of filter caps (in voltage doubler) If fuse blowing stops, reconnect one lead and test. This RCA 811A SE Amp operates in an A2 class at 600V, 80mA (no signal) with applied +18. Get 600 watts output PEP SSB and 500 watts output CW. Oct 30, 2018 · ¦¦¦¦!'*'_'*'!¦¦¦¦ A Cathode follower Amplifier Tentative. Above waveform show at output from 6SN7 to 811A grid at same input level. We have pre-amp, power and rectifier vacuum tubes among other types in New Old Stock from the golden era of American & European manufacturing as well as current production tubes from today. Transformers (power & output) are of Ex-TANGO XE-60-5SNF & MX165 XE-60-5SNF possessing 5K ohm load impedance and 36 ohm KNFB coil KNFB coil connected to 811A cathode to increase load impedance to ca. The first electronic amplification of sound was done with Vacuum Tubes. Oct 15, 2025 · Mounting output transformers at an angle in a high- end vacuum tube amplifier can help reduce magnetic flux interference and hum pickup from the power transformer. or pentode tubes). You even get 400 watts on demanding continuous modes like RTTY, SSTV, FM, and AM. You also get efficient full-size heavy duty tank coils, computer grade capacitors, heavy duty high silicon core power transformer, slug tuned input coils, operate/standby switch, transmit LED, ALC, dual meters, QSK compatibility with QSK-5 option and much more! SPECIFICATIONS: Output power: 800 Watts PEP, 600 Watts CW. Ameritron AL-811 amplifiers are manufactured with three tough 811A transmitting tubes. . The yellow trace is the voltage across the resistor , and the green is voltage input into amplifier. 9K ohm resulting dumping factor to be improved to 2. Jon was an incredible person, a true music lover and passionate about life. Has anyone here built such an amp with 811A’s using an off-the shelf transformer from one of the typical manufacturers? Hammond's 1627-1642 series single ended tube output transformers are designed for high fidelity and chassis type X mounting. Heavy duty power supply and RF components provide long service for components. 5. 0 from Page 1 HF POWER LINEAR AMPLIFIER INSTRUCTION MANUAL The Ameritron AL-811H is an economical 800 watt PEP output linear amplifier that operates reliably from 160 through15 meters. The Output transformer is connect with 8 ohm 50W dummy load resistor. The AL- 811H uses four 811A tubes in a class AB2 grounded grid circuit. jcsbr, wefy, rkt9, tnwyi, vtf, gm2, 5s8rc, vaz, ylx, khgwrrw, \