HP 8447D AMPLIFIER
The 8447D is a general purpose wideband amplifier with a frequency range of 100kHz to 1.3GHz. This cost $765 in 1980. A Manual was downloaded.
Gain is 26dB ±1.5dB with a noise figure of <8.5dB and a maximum output level of +7dBm. 50Ω input and output impedance and a maximum dc input voltage of ±10V. Other versions were also available: 8447A 100kHz to 400MHz, 20dB gain, >+6dB output; 8447C 30MHz to 300MHz, 30dB gain, >+17dB output; 8447E 100kHz to 1.3GHz, 22dB gain, >+15dB output. Also the 8447F which is a D and E version in one case.
The Amplifier consists of a power supply and a thin film hybrid integrated circuit amplifier which is hermetically sealed. This has low noise, low distortion, flat frequency response, long term stability & reliability. Front Panel BNC input and output connectors.
Rear Panel power connector, fuse and voltage selector.
The 8447D is in good condition and just needed cleaning. Powers up ok and a quick test shows that it is amplifying without any obvious distortion. Performance tests need to be carried out.