• Year
  • 1937
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 19043
    • alternative name: Chicago Radio Lab

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); ZF/IF 456 kHz
  • Wave bands
  • Broadcast, Short Wave(s) and Police.
  • Power type and voltage
  • Alternating Current supply (AC) / 115 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 6 inch = 15.2 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 5S119 Ch=5516 - Zenith Radio Corp.; Chicago,
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 20 x 11.5 x 9.1 inch / 508 x 292 x 231 mm
  • Notes
  • There is also a version to operate from 25 to 60 Hz and selectable from 95 to 220 V.
  • Price in first year of sale
  • 45.00 $
  • External source of data
  • E. Erb 3-907007-36-0
  • Circuit diagram reference
  • Rider's Perpetual, Volume 7 = 1936 and before
  • Literature/Schematics (1)
  • -- Original-techn. papers.

 Collections | Museums | Literature


The model 5S119 is part of the collections of the following members.


Forum contributions about this model: Zenith Radio Corp.;: 5S119 Ch=5516

Threads: 3 | Posts: 12

Hello! Would appreciate help with the 5S119 I’m restoring.

Here’s where I am:

* All electrolytic and paper capacitors replaced

* All resistors beyond 15% replaced

* All tubes test OK, except 6Q7, awaiting replacement

So, although the 6Q7 is measuring weak in all sections (no shorts), I decided to fire the chassis up with it in place as the replacement hasn’t arrived. I brought it up slowly with the variac/isolation/dim-bulb, and the dial lamps lit and there were no problems with shorts. The only sound produced, though, is a buzz which is there regardless of volume setting. All controls seem to have no effect on sound. 

I consulted the “socket voltage” guidelines in the schematic and found the following upon testing the relevant points:

1. 5Y3: 240V AC in, 240V DC out. Appears to be ok.

2. 6F6: Pins 3/4/7 measure correctly, pin 5 is supposed to be -5V, I’m getting -25V

3. 6Q7: Pin 3 is supposed to be 75V, I’m getting 240V. Pins 4/5 should be .1V, I’m getting 2.3V. Pin 7 measures OK. Pin 8 is supposed to be 1.5V, I’m getting 2.4V

4. 6K7: Pin 3 OK at 240V. Pin 4 is supposed to be 85V, I’m getting 112V.  Pin 5 measures 0V. Pins 7/8 OK.

5. 6A8 Pin 3 OK at 240V. Pin 4 is supposed to be 85V, I’m getting 115V. Pin 5 supposed to be -1, I’m getting 114V. Pin 6 supposed to be 166, I’m getting 196. Pins 7/8 measure OK.

Measurements were done with the Variac dialed to produce 112V at AC in.

The 6Q7 measures as a bad tube, but even without it in the circuit, I’m still getting 240V at pin 3 where there is only supposed to be 75V.

All voltage tests were also done with the speaker/field coil plugged into circuit. The schematic states that field coil resistance is supposed to be 2125 ohms, but mine measures 852 ohms. The speaker itself states that it is a model 49-165-X rated for 1000 ohms. The schematic states that speaker 49-143-6 is supposed to be the correct speaker. So, perhaps the wrong speaker is included with my radio. Because of the concern of improper field coil resistance, I wired a 2.2K resistor in place of the field coil. With the 2.2K resistor in place, I still had an excess of 230 volts on pin 3 of the 6Q7. 

Further, without the field coil/speaker plugged into the chassis, I measure 30V on pin 3 of 6Q7.

Does anyone have any thoughts/suggestions? Although the 6Q7 is measuring weak, I don’t think that’s causing all these voltage anomalies. I’ve rechecked all the values of the resistors and everything appears to be in order there. Could a bad resistor or wrong value resistor be causing the issue? If so, which would be the most likely suspect? Or, is the field coil resistance discrepancy to blame? And why just hum with no volume control? Because the 6Q7 is weak?

Thanks for your help in advance!


Christopher Pallotta, 29.Nov.17

Weitere Posts (7) zu diesem Thema.

Hello, I'm currently working on restoring a 5S119 and have come across a notation in the schematic that indicates a phono jack input and phono switch. Additionally, there's an alternate drawing of the second detector tube labeled, "Circuit changes for phonograph."

My radio does not have a phono jack/switch and after looking at other photos of this model online, I haven't come across one that does. The circuit changes are very simple though, so it certainly helps if I wanted to add this input. Was it intended that others would do the same themselves using this schematic as a guide or was this actually a factory-supplied option from Zenith?

Any insight appreciated. 

Christopher Pallotta, 03.Nov.17

Weitere Posts (3) zu diesem Thema.

the first tube in the line up of tubes listed is supposed to be a 6A8G and not a 6AB6.

John Allen, 28.Aug.10

Weitere Posts (2) zu diesem Thema.