Looking into the grille on its backside reveals a glimpse of the glass electron tubes inside. It lives inside a brown texture-painted metal case measuring about 8" x 8" x 10" with a sturdy handle and hardware, its front cover (which holds the mic and power cord when 'stowed') is detachable. It works in basically exactly the same way, its microphone 'hears' the pitch of an instrument and shows a spinning 'graph' of bars on its backlit display which appear to move slowly to one side or the other (indicating "sharp" or "flat") until the note is "in tune" and the graph remains still. etc.) but they no doubt also provided much inspiration to the Peterson engineers - in fact, by the mid 1980's the Peterson Company purchased the rights to the CONN line of tuners and assumed official 'factory maintenance/service' for them in addition to their own. At that time, these machines were likely much more commonplace than their equivalent Peterson machines for the same purposes (piano tuners, bandrooms, backstage symphony or rock concerts, etc. of Elkhart, IN (also known for making band instruments, which I think they still make today?) it is a model SL-6, produced from approx. This is another vintage 'industry standard' instrument tuner, which ever-so-slightly pre-dates the PETERSON model 400 solid-state machine shown yesterday. !!functional!! This is for the musician enthusiast. I don't have a way to truly test it as all I had was a cheap radio shack mic. It definately is vacuum Tube and from the era described. Vintage Conn StroboTuner St-1 - 40s/50s HiFi Vacuum Tube Tuner. ![]() 1940s/50s Conn Vacuum Tube Strobo Tuner Working - $90 (springfield). ![]() I hooked a no gain mic up to it and it did react to it but of course this is a tuner which determines pitch, a. StroboTuner St-1 - 40s/50s HiFi Vacuum Tube Tuner.
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