Flipping through some circa 1960AES journals I came across this pair: The Scott 140B preamplifier and 250B fifty-watt power amp. The 140B pre claims a response of 1hz to 3.5Mhz. This is absurdly good performance for a vacuum tube amplifier. I am guessing that this is a transformerless piece. Anyone have any experience with this unit? A schematic? Drop us a line. The 50-watt power amp likely does use an output transformer; it claims a response of 5hz to 60K hz, which is outstanding as well. Let us know if you’re using these in the studio..
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2 replies on “Scott Laboratory Tube Amplifiers of the early 1960s”
Almost all preamps for hi-fi are transformerless, and this is probably really intended more as a hi-fi or a broadcast piece than a piece of lab gear. Extended HF response can be a real problem in audio gear, when they start picking up and passing RF, and worse, sometimes oscillating via the “antennas”. But there were lab uses for this kind of stuff.
McIntosh amps all went as high as 50 kHz out and some as high as 100 kHz. A lot of them were used to relay baseband telemetry and more recently to test notebook display backlights (see the late Jim WIlliams’ books).
I need schematic scott 272tl please thank yuo.