RADIO SERVICING
BUSH
Models TR 130 and TRI30D
General Description:
Models TR130 and TR130D are battery
operated portable receivers, each using seven transistors and one crystal
diode, and covering the Long and Medium wavebands. An additional
range provides electrical bandspread of the high frequency end of the
Medium waveband. Both models are electrically identical, differing
only in presentation.
Wavebands:
L.W. band: 1070-1900 m. (280 to IS8 kc/s.). M.W.
band: 187-S70 m. (160S to S2S kc/s.). B.S. band: 187-210 m. (160S to
1430 kc/s.).
Battery:
One 9-volt Ever Ready type PP9 or Drydex type DT9. The
battery consumption is IS mA. quiescent and 2S mA. at average listening
level.
Transistors (Mullard Type):
VTl (AFII7) Mixer/oscillator. VT2
(AFII7) I.F. amplifier. VT3 (AFII7) I.F. amplifier. VT 4 (OC71) Audio
amplifier. VTS (OC81D) Driver stage. VT6 (OC81), VT7 (OC81)
Push-pull output.
Crystal Diode:
CDl (OA90) Detector.
Earpiece Socket:
A socket is provided at the side of the receiver into
which may be plugged an earpiece of 20-1000-ohms impedance. Alterna
tively, this socket may be used with an external loudspeaker of Is-ohms
impedance.
Tape Recording:
No special provision has been made, but the earpiece
socket provides a low-impedance output source to which a tape recorder may
be conducted. The connecting lead should be terminated with a resistor of
about I S ohms. It should be noted that the internal loudspeaker will be
muted when using this method of recording.
CAPACITOR
F42
DRIVE DRUM
DRIVE CORn
106
