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KP 3Q4

Country:  Australia
Manufacturer / Brand:  Astor (brand), Radio Corporation Pty., Ltd.; Melbourne
alternative name
Radio Corp.of Australia
Year: 1947 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: 1T4 1R5 1T4 1S5 3Q4
Main principle Super-Heterodyne (Super in general); ZF/IF 455 kHz
Wave bands Broadcast only (MW).
Power type and voltage Dry Batteries / 90 & 1.5 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Model: KP [3Q4] - Astor brand, Radio Corporation
Material Leather / canvas / plastic - over other material
Shape Portable set > 8 inch (also usable without mains)


Features: 5V, B/C; tuned R.F. stage; 8" speaker; on/off switch on volume control; loop aerial on chassis; external aerial and earth terminals; mooulded carrying handle, aeroplane cloth covered ply case, colours as available; overal size 13½' x 10¼" x 5"; weight 16 lbs., uses two 482 and one 745 batteries.

Retail selling price: £27/18/6 (1948). (£29/10/-, in 1949)

Battery types used:

  • (A) 1 x 745 (Eveready) or 3745 (Diamond)
  • (B) 2 x 482 (Eveready) or 3482 (Diamond)

Due to post war shortages of 3V4 valves some models were supplied with 1Q5GT or 3Q4 output valves. Also, again due to shortages, some models had the 1T4 valve the in I.F. stage substituted by a type 1L4, with no circuit changes.

"The second production run of the five tube portable receiver Model 'KP' has been modified to use a type 3Q4 tube in place of the 3V4 tube. The modification is due to the shortage of type 3V4 tubes. Should it be required to change the 3Q4 tube to a type 3V4 tube, no circuit alterations are necessary except for the wiring of the tube socket."

See also models Monarch Minstrel CKP, Peter Pan Adventurer CKP & National AKP.

Price in first year of sale 24.95 AUS £
Literature/Schematics (1) - - Manufacturers Literature (Astor Technical Bulletins KP-1 to KP-8. Dates range between 30/11/1946 & 25/1/1950.)
Literature/Schematics (2) Australian Official Radio Service Manual AORSM (Volume 6, 1948, Page 72.)

Model page created by Martin Kent. See "Data change" for further contributors.

All listed radios etc. from Astor (brand), Radio Corporation Pty., Ltd.; Melbourne
Here you find 823 models, 301 with images and 342 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.