7570 Model 20C, 20 Compact UV-sockets

Atwater Kent Mfg. Co.; Philadelphia, USA

  • Year
  • 1925
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 33219

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • TRF without regeneration
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 7570 Model 20C, 20 Compact [UV-sockets] - Atwater Kent Mfg. Co.;
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 20 x 6.25 x 6.25 inch / 508 x 159 x 159 mm
  • Notes
  • The "C" is not shown on the label !
    Can also accept UX tubes.
    There is also the 20C Compact with UX sockets and the 20 big box.!
  • Net weight (2.2 lb = 1 kg)
  • 5.4 kg / 11 lb 14.3 oz (11.894 lb)
  • Price in first year of sale
  • 80.00 $
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

 Collections | Museums | Literature


Forum contributions about this model: Atwater Kent Mfg. Co: 7570 Model 20C, 20 Compact

Threads: 3 | Posts: 8

Reading about the markings (Not Guaranteed) under the metal label on the Model 20 cabinet reminded me that I had found a printed serial number under the front panel brass label while restoring my model.


I attach a photo of the printed serial number hidden behind the front panel label.


I assume that the serial number is under the brass front panel label for some security or warranty purpose.

I had to reattach the printed serial number label to a new piece of backing as it was very fragile (nearly 90 years old)

I wont lift my cabinet metal label to see if it has “Not Guaranteed” under it as it is held on too well.


kind regards

Lindsay Shepherd


Lindsay Shepherd, 09.Nov.11

Weitere Posts (1) zu diesem Thema.

A guest sent us an interesting photo.
He unscrewed the plate of this model 20 and was astonished to find this clear stamp that this set is "NOT GUARANTEED".

His own text is:

We received this by courtesy of guest Tom Hart, Dedham, MA, USA.
I have been refinishing an Atwater Kent Model 20 TRF receiver. The original finish was gone and needed complete replacement. When I removed the metal label from inside of the top lid, I found an interesting notice.

The photo shows the text. Apparently, this was burned into the wood under serial number name plate (which is shown in the photo). Atwater Kent probably did this to refuse service for a radio without the serial number information, I suspect.

You find a bigger picture at the photos of the set - with the courtesy remark.

This compact model was most probably the most sold model 20 (compact, 7570 UV-sockets) from Atwater-Kent. The many collections we show for this model are also prooving this. But said this, we can also see that the 20 "big box" 4640 must have nearly the same sales figures, whereas the others seem to be much less sold. We list 10 different models for this "series" 20.

I hope that not everybody will now unscrew the plate - but still, it would be of interest to know in which circumstances we find that "warning" and in which not.

Ernst Erb, 30.Nov.10

Weitere Posts (6) zu diesem Thema.

Anmerkungen zum Gerät:
Bestückung ist 5 * 201A oder Äquivalente. Es wurden 1925 163.776 Geräte dieser Serie gebaut, 1926 noch einmal 119. Der Preis ohne Röhren betrug 1925 USA-$ 80.
Keine Rückkopplung, 3 Kreis, Mittelwelle; Maße: 500 / 160 / 190

Korrektur und Ergänzung am 11.03.2004 nach Rücksprache mit Herrn Birkner (danke!):

Keine Rückkopplung, 3 Kreise, Mittelwelle; Maße: 500 / 160 / 190
7570 ist die erste Compact (C) Serie des Model 20. Die technisch praktisch gleich ausgeführte 4640 Serie wurde ausschließlich im normalen Cabinet gebaut, der sogenannten "Big Box". Die 1925 gebaute Stückzahl der 7570 betrug 163.376.
Die 1924 eingeführte 4640 Big Box kostete $100, das Deluxe Model 24 (Serie 4920) dagegen $120, das ebenfalls 1924 produzierte Breadboard 10C $85. Schon 1926 kostete dann die zweite 20C Serie (7960) nur noch $60. Alle diese Receiver waren technisch gleichwertig. Das zeigt auch sehr gut, wie preissensitiv der Markt damals schon war.

Ralf Sürtenich, 23.Feb.04

Weitere Posts (1) zu diesem Thema.