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G6Tanuki · 17th Jul 2017, 5:59 pm

In WWII-era parlance "VT" was "Valve, Transmitting" [and VR was "Valve, Receiving].

Must admit, as time went on and transistors proliferated, I really liked the Dutch "ELEKTOR" magazine's approach to "use whatever generic device you have here, it's not at all critical" .

TUP - Transistor, Universal PNP
TUN - Transistor, Universal, NPN
DUG - Diode, Universal, Germanium
DUS - Diode, Universal. Silicon.

of course by the 1980s a "generic" small-signal silicon transistor had a Ft and UHF noise-figure which people could only have dreamed-of in the 1960s.

[This sometimes causes problems: designers of audio amps in the 1960s assumed the devices they specified had sod-all VHF/UHF gain; which was fine until someone replaced an old 'anything above audio-frequencies is a bit of a strain' transistor with a 'modern' amplifies-DC-to-light equivalent and suddenly found they were receiving police/taxi VHF two-way radio transmissions].

17th Jul 2017, 5:59 pm	#6
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Lesson R,L,C,T,V,D but Q and U ? In WWII-era parlance "VT" was "Valve, Transmitting" [and VR was "Valve, Receiving]. Must admit, as time went on and transistors proliferated, I really liked the Dutch "ELEKTOR" magazine's approach to "use whatever generic device you have here, it's not at all critical" . TUP - Transistor, Universal PNP TUN - Transistor, Universal, NPN DUG - Diode, Universal, Germanium DUS - Diode, Universal. Silicon. of course by the 1980s a "generic" small-signal silicon transistor had a Ft and UHF noise-figure which people could only have dreamed-of in the 1960s. [This sometimes causes problems: designers of audio amps in the 1960s assumed the devices they specified had sod-all VHF/UHF gain; which was fine until someone replaced an old 'anything above audio-frequencies is a bit of a strain' transistor with a 'modern' amplifies-DC-to-light equivalent and suddenly found they were receiving police/taxi VHF two-way radio transmissions].