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Three carbon compound resistors, a germanium Mullard OC44 transistor, two film capacitors and two aluminum electrolytic capacitors find themselves mounted over a piece of terminal strip inside the unit's chassis and the UK Welwyn 10k ohm potentiometer was mounted to the body of the chassis via two mounting screws, along with the input jack and ...
Mullard's first silicon transistors were the OC201 to OC207, PNP alloy types using the standard SO-2 metal-over-glass construction such as the OC200 shown. From about 1960 Mullard switched to using the BC prefix for silicon, and AC for germanium, eliminating the confusion of part numbers. in the mid-1960s the first plastic packages were introduced.
The Tone Bender MKII is a three transistor circuit [1] based on the MKI.5 version, but with an additional amplifier gain stage. Sola Sound produced the circuit for Vox (who sold their version as the "Vox Tone Bender Professional MKII"), [5] Marshall (who sold their version as the "Marshall Supa Fuzz"), [6] and Rotosound (who sold their version as the "RotoSound Fuzz Box". [7]
The prefix is followed by a two-, three- or four-digit number with no significance as to device properties, although early devices with low numbers tend to be germanium devices. For example, 2N3055 is a silicon n–p–n power transistor, 2N1301 is a p–n–p germanium switching transistor. A letter suffix, such as "A", is sometimes used to ...
Just like the Dallas Rangemaster, the Hornby Skewes treble booster was an amp-top unit. While early Hornby Skewes Treble Booster units used a germanium transistor, the later, better-known version features a silicon transistor. Rumour
The first low-cost junction transistor available to the general public was the CK722, a PNP germanium small signal unit introduced by Raytheon in early 1953 for $7.60 each. In the 1950s and 1960s, hundreds of hobbyist electronics projects based around the CK722 transistor were published in popular books and magazines.