• Year
  • 1957
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 148573

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Superheterodyne (common); ZF/IF 470 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Line / Batteries (any type) / 200-250 / 1.5 & 90 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4.5 inch = 11.4 cm
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: 29 - Invicta Radio Ltd.; Cambridge,
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 10.5 x 5 x 8 inch / 267 x 127 x 203 mm
  • Notes
  • Attache style radio same chassis as model 28. Similar to Pam models 712 & 716, also Pye model P114BQ.
  • Price in first year of sale
  • 17.00 GBP
  • Source of data
  • -- Schematic
  • Circuit diagram reference
  • Radio and TV Servicing books (R&TVS) book
  • Mentioned in
  • Attache Radios. By Mark Johnson.
  • Author
  • Model page created by Keith Staines. See "Data change" for further contributors.

 Collections | Museums | Literature


The model is part of the collections of the following members.


Forum contributions about this model: Invicta Radio Ltd.;: 29

Threads: 1 | Posts: 5

I recently restored an Invicta 29 (A Pye Chassis same as Invicta 28, PAM 712, PAM716 and Pye Jewel Case with PCB version).

The question I asked people was where should the sceen can be?

I have seen both photographs

Pye Jewel case on RMorg

Screen on DAF96 (possibly wrong)
(RMorg Pye Jewel Case 1955)

and also

screen on DL96 (Invicta 29)

Screen on DL96 (probably right)
(Invicta29, also Pye)

Notice the 1955 and 1957 chassis are identical. Also I have seen in various photographs of the similar chassis the screen on DL96 or DAF96.

Well the DAF96 is sensitive and renowned for "Microphony", so I thought also since the RMorg photo showed it, that the DAF96 was correct location.

But I noticed that for a about 1/3rd of the mid range of the volume the Radio would often "squeal", always when "cold" and less so after an hour or two.

So I swapped screen shield (which has a soldered earth wire) to the DL96 output pentode and from cold the problem of "feedback squeal" at certain volume levels is cured.



Michael Watterson, 04.Oct.11

Weitere Posts (5) zu diesem Thema.