6A229 Ch=5640AT

Zenith Radio Corp.; Chicago, IL

Data
Forum
Pictures
Collections

  • Year
  • 1938
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 67692
    • alternative name: Chicago Radio Lab

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superheterodyne (common); ZF/IF 456 kHz
  • Wave bands
  • Broadcast, Long Wave and Short Wave.
  • Power type and voltage
  • Alternating Current supply (AC) / 110-250 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 6 inch = 15.2 cm
  • Power out
  • 4.5 W (unknown quality)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 6A229 Ch=5640AT - Zenith Radio Corp.; Chicago,
  • Shape
  • Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.
  • Dimensions (WHD)
  • 0 x 18 x 0 inch / 0 x 457 x 0 mm
  • Price in first year of sale
  • 40.00 $
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 10 = 1939 and before

 Collections | Museums | Literature

 Forum

Forum contributions about this model: Zenith Radio Corp.;: 6A229 Ch=5640AT

Threads: 1 | Posts: 5

Hello dear members

   greeting every one

a friend sent me a zenith radio model 6A229 as a gift.....the thing is that somebody tried before me to repair it....the band switch is in mess all the wires is been cut but this is not the current problem for me

(at least for now)...so i started with changing the paper and electrolytic caps.all were out of specs.

the problem is when you connect the speaker plug to the back of the radio(which have a field coil with 820 ohms DC resistance and the primary of the out put transformer is 570 ohms and i did not find any shorts in the speaker assembly) the voltage drops from 270-280 DC to 60-70 volts DC on the electrolytic caps.....i reviewd all the caps. that i have changed for any mistakes in the connections several times and all looks ok...my next thought was that there might be a problem with the canohm resistor so i checked the resistance and it measures 300 ohms(from C18 to R10 170 ohms,from R10 to C19  30 ohms and from C119 to ground 100 ohms)..the rest of the resistors are ok

is that normal for the canohm resistor? i could not found the value of this resistor any where

is it possible the the cause of the voltage drop id due to low resistan of the candohm resistor.

thank you very much and any kind of help is appreciated

 

yours

 Aras

Attachments

Aras Mahmood, 11.Jan.19

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