WW2 German Radios

VE 301 modifications. Restoration & troubleshooting.

Model Power Tubes Speaker Switching and wiring diagram
VE 301 W (alt) For AC voltages 110, 130, 220 volts +/- 10%
Power consumption about 20 watts
Fuse 500 mA
Telefunken: REN 904, RES 164, RGN 354
Valvo: A 4110, L 416 D / 5 pins, G 354
Cantilever 2000 ohms Circuit Chassis
VE 301 G For DC voltages 110, 150, 220 volts
Power consumption ~23, ~30, ~45 watts
Fuse 500 mA
Telefunken: 1821, 1823 d
Valvo: A 2118, L 2318 D
Cantilever 2000 ohms Circuit Chassis
VE 301 B 1 Heating battery 4 V
Heating current 270mA
Anode battery 90 V
Anode current ~ 6mA
Telefunken: RE 034, RE 034, RES 174 d
Valvo: W 406, W 406, L 415 D, 4 pins
Cantilever 2000 ohms Circuit Chassis
VE 301 B 2 Heating battery 2 V
Heating current 280mA
Anode battery 90 V
Anode current 2-8 mA (average 4 mA)
KC 1, KC 1, KL 1
VE 301 GW For DC and AC voltages 110, 125, 150, 220, 240 V
Power consumption DC 12, 13, 10, 16, 17 watts
Power consumption AC 13.5, 14.5, 10.5, 17.5, 18.5 watts
Fuse 500 mA
VC 1, VL 1, VY 1 Cantilever 2000 ohms Circuit Chassis
VE 301 W (neu) For AC voltages 110, 130, 220 volts +/- 10%
Power consumption about 20 watts
Fuse 500 mA
Telefunken: AF 7, RE 164, RGN 354
Valvo: AF 7, L 416 D, G 354
Cantilever 2400 ohms Circuit Chassis


"People's receiver" common defects

Source, original in german: Rudolf Schadow, Systematische Fehlersuche an Rundfunkgeräten, 1938


No reception and network hum not heard:
  1. Rectifier tube electrode termination, no emission or filament interrupted. At the VE 301 GW, a filament interruption of every other tube leads to complete failure.
  2. Speaker tube electrode termination, no emission or filament interruption. On the VE 301 G and GW the Audion tube can also have filament interruption.
  3. Speaker coil interrupted.
  4. Interruption at the mains transformer (only VE 301 W).
  5. Partial capacitor of 4 microfarads in the common capacitor short circuit. The replacement of the entire Sammelkondenstors can be circumvented by the installation of an additional capacitor.
  6. Screen resistance 3000 ohm interrupted; if burnt, first check the 4 microfarad condenser in the collecting block and the end-tube at the end (only for the two units 301 W).
  7. Resistor 700 ohms interrupted at the anode of 354.
  8. Grinder on hum-potentiometer no contact acceptance.
  9. Tube base solder connection demolished.

No reception and net buzz audible:
  1. Speaker tube electrode termination.
  2. Audion tube electrode termination, no emission or filament defective.
  3. Resistance to the shielding of the end tube interrupted when burned, the 0.1 microfarad capacitor in the collection block and the end tube to be tested in advance.
  4. Anode side of the low-frequency transformer interrupted.
  5. Antenna coil burned or interrupted.
  6. Grid capacitor at the Audion short.

Weak reception:
  1. Tubes have subsided.
  2. Speaker anchor is stuck; Speaker coil winding closure.
  3. LF transformer interrupted on the grid side.
  4. Antenna coil burned.

Humming especially on the VE 301 W: Without rectifier tube:
  • iron core of the power transformer loose, sheets swing with.
Without audio tube:
  • Speaker tube electrode termination.
  • Grounding potentiometer interrupted or one end shorted to the sliding contact.
  • Interruption of the capacitor 4, 2, or 0.1 microfarads in the collecting block. At the VE 301 W new the electrolytic capacitors 4 microfarads and the two 0.1 microfarad partial capacitors of the triple wound capacitor are to be examined for interruption.
Grows only after inserting the Audion tube:
  • Audion tube shorted grid or cathode filament.
  • Coil line interrupted at the grid coil (usually manifests itself by brighter humming).

Hum at the VE 301 G and GW
  1. Tube Electrode filament closure.
  2. Mains reactor shorted.
  3. Interruption at the collecting capacitor.
See also distortions!
Howl: Only during heating:
  • End tube, especially at the VE 301 W howls at unloaded control grid.
in working condition with all tubes:
  • Audion tube microphonically sensitive.
  • Rotary capacitor susceptible to sensitivity.

Distortion:
  1. 1st end tube distorted, with the VE 301 B the choice of the correct grid voltage must be considered.
  2. LF transformer secondary winding interrupted.
  3. Resistor interrupted 2 megohms before the NF transformer.
  4. Coupling capacitor in VE 301 W new or VE 301 B between grid and anode has fine closure (contact resistance, therefore positive grid bias).
  5. In VE 301 B 2: Sirutor no rectifier effect; Coupling capacitor between anode KL 1 and Sirutor interrupted.

Clink:
  • Most speaker error.

Sizzling, scratching sounds, intermittent reception:
  1. loose contacts in the tubes, especially at the piston ports of the VC1, VL1 and AF7.
  2. Interruptions in the low-frequency transformer.
  3. Resistors, especially the 3000 ohms in VE 301 W, burn slowly or show inconsistency.
  4. Bad solder joints; unsafe contacts of the switches.

Operating defects:
  1. Feedback is not working: wire on the feedback capacitor is torn off; Coil connection interrupted.
  2. Voting does not change: drive jumped out of the scale disc; Rotor package of the rotary capacitor not screwed on the axle; Strator connection demolished.

Operational defects: Power consumption too high (burning smell):
  1. rectifier tube closure.
  2. Even without a rectifier tube: on or in the mains transformer.
  3. If only with perfect equalizer tube: Short circuit in the accumulation capacitor.
Fuses burn for no apparent reason:
  • temporary short circuit in the accumulator.

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