Bruel & Kjaer 2113 Audio Frequency Spectrometer

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via this auction

Beautiful color.

See LMNC's video with several here.

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SOLID STATE Versus VALVE Bruel & Kjaer 1022 Beat Frequency Oscillator Modifications

video upload by LOOK MUM NO COMPUTER

"The Beginning of a big Test Equipment Project.
loads Samples of these experiments amongst many more!:-
https://www.patreon.com/lookmumnocomp...
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Tickets To This weekend and other weekends at @THIS MUSEUM IS (NOT) OBSOLETE are available here:-
https://this-museum-is-not-obsolete.com"

Bruel & Kjaer 2105 Frequency Analyzer & Peekel TF823 Multi Octave Filter

Mono - Poly

"At the Waveform Research Centre"

Peekel TF823 Multi Octave Filter

A Most Amazing Analog Filter | Bruel & Kjaer 2107

Published on Jun 25, 2019 HAINBACH

"In which you will see me being happy turning the huge knob of the Bruel & Kjaer 2107 Frequency Analyzer, an incredible vacuum tube amplifier and band pass filter from the 1960s. This was used to analyze signals and vibrations in the most demanding circumstances, but I use it as a glorious overdrive and rich overtone generator. Seriously, this thing sounds a Lagavulin Single Malt by the Atlantic in autumn."

You can find HAINBACH's Test Equipment Music FAQ and Guide here.