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M6D Silicon transistors.

M6D ; Astor brand, Radio (ID = 2026290) Radio
M6D ; Astor brand, Radio (ID = 2026291) Radio
M6D ; Astor brand, Radio (ID = 2026292) Radio
M6D ; Astor brand, Radio (ID = 2026293) Radio
M6D ; Astor brand, Radio (ID = 1386802) Radio M6D ; Astor brand, Radio (ID = 1386803) Radio
M6D ; Astor brand, Radio (ID = 1386814) Radio M6D ; Astor brand, Radio (ID = 1349715) Radio
M6D ; Astor brand, Radio (ID = 1349716) Radio M6D ; Astor brand, Radio (ID = 1349717) Radio
M6D ; Astor brand, Radio (ID = 1349774) Radio
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M6D ; Astor brand, Radio (ID = 1386802) Radio
Astor brand, Radio: M6D [Radio] ID = 1386802 933x552
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For model M6D Silicon transistors., Astor (brand), Radio Corporation Pty., Ltd.; Melbourne:
Compare this with 'As Found' photo.
Country:  Australia
Manufacturer / Brand:  Astor (brand), Radio Corporation Pty., Ltd.; Melbourne
alternative name
Radio Corp.of Australia
Year: 1968 Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 5: AT325 AT319 AT319 AT319 AX1167 BA100 BA100 1N295
Main principle Superheterodyne (common); ZF/IF 455 kHz
Tuned circuits 5 AM circuit(s)
Wave bands Broadcast only (MW).
Power type and voltage Alternating Current supply (AC) / 240 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
Power out 0.1 W (unknown quality)
from Model: M6D [Silicon transistors.] - Astor brand, Radio Corporation
Material Modern plastics (no Bakelite or Catalin)
Shape Tablemodel without bush buttons, Mantel/Midget/Compact up to 14
Dimensions (WHD) 350 x 120 x 100 mm / 13.8 x 4.7 x 3.9 inch

This model is the 3rd generation of a transistor mains powered mantle radio produced by Astor using the same style plastic case. Supercedes earlier model M5D. Virtually indentical in appearance to model M5D, this version is the first to use all silicon transistors.

Made by Radio Corporation Pty Ltd, Sth. Melbourne Victoria. It is a simple radio with no tone control. With only five transistors, a single output transistor and only two transistors in the AF stage, volume is not high but adequate for household listening. With the speaker only having a small magnet (about 1 inch in diameter) has no significant volume output. On the other hand, the receiver incorporates a 9 inch ferrite rod antenna but without provision for any external antenna. Tuning is by a "Hand-span" dial of 95mm diameter

Differences between the early and later production runs are noted on the schematic. In addition to a different circuit board, there are five other component values changed.

The power supply is full wave rectified with a centre tapped mains transformer. The two BA100s provide the rectification with 100µF cap, a 220 Ohm decoupling resistor and a 200µF cap providing the smoothing. Specified output voltage is high ar 17.2 Volts which probably accounts for the AX1167 output transistor having a "Flag" heatsink. The remaining diode provides the AGC voltage.

This receiver would not comply with modern safety protocols for a mains operated receiver as there in no strain releif where the cord enters the case and the central boss of the tuning knob is in electrical contacts with parts of the tuning cap with only the normal insulation of the three core flex to provide safety. Also the volume control pot, which incorporates the Off/On switch, has a metal knob. Unusually, there is no provision for a dial lamp.

The service instructions are comprehensive, listing component changes, Alignment equipment and conditions, dial setting, IF alignment and broadcast alignment as well as a full schematic.

Available in 12 colours: Wedgewood, Spruce, Wattle, Charcoal, Cherry, Cinnamon, Willow, Grey, Flamingo, Squirrel, Yellow Pastel & Coral.

Net weight (2.2 lb = 1 kg) 1.8 kg / 3 lb 15.4 oz (3.965 lb)
Mentioned in Silicon Chip magazine, September 2016. P102
Literature/Schematics (1) - - Manufacturers Literature (Astor Model M6D-1, 13/9/1968.)
Literature/Schematics (2) J.R. Publications Transistor Radio Service Handbook (Group G7, 1970, Page A85.)

Model page created by Brian Wilson. See "Data change" for further contributors.

All listed radios etc. from Astor (brand), Radio Corporation Pty., Ltd.; Melbourne
Here you find 843 models, 422 with images and 343 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Astor brand, Radio: M6D
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astor: M6D
Brian Wilson


Forther research reveals that this is an M5D, the circuit and the PCB are different. The PCB for the M6D is labeled OP79-3



Astor brand, Radio: M6D
End of forum contributions about this model