WW2 German RadiosVE 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:
- 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.
- Speaker tube electrode termination, no emission or filament interruption. On the VE 301 G and GW the Audion tube can also have filament interruption.
- Speaker coil interrupted.
- Interruption at the mains transformer (only VE 301 W).
- 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.
- 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).
- Resistor 700 ohms interrupted at the anode of 354.
- Grinder on hum-potentiometer no contact acceptance.
- Tube base solder connection demolished.
No reception and net buzz audible:
- Speaker tube electrode termination.
- Audion tube electrode termination, no emission or filament defective.
- 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.
- Anode side of the low-frequency transformer interrupted.
- Antenna coil burned or interrupted.
- Grid capacitor at the Audion short.
Weak reception:
- Tubes have subsided.
- Speaker anchor is stuck; Speaker coil winding closure.
- LF transformer interrupted on the grid side.
- 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
- Tube Electrode filament closure.
- Mains reactor shorted.
- 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:
- 1st end tube distorted, with the VE 301 B the choice of the correct grid voltage must be considered.
- LF transformer secondary winding interrupted.
- Resistor interrupted 2 megohms before the NF transformer.
- Coupling capacitor in VE 301 W new or VE 301 B between grid and anode has fine closure (contact resistance, therefore positive grid bias).
- In VE 301 B 2: Sirutor no rectifier effect; Coupling capacitor between anode KL 1 and Sirutor interrupted.
Clink:
Sizzling, scratching sounds, intermittent reception:
- loose contacts in the tubes, especially at the piston ports of the VC1, VL1 and AF7.
- Interruptions in the low-frequency transformer.
- Resistors, especially the 3000 ohms in VE 301 W, burn slowly or show inconsistency.
- Bad solder joints; unsafe contacts of the switches.
Operating defects:
- Feedback is not working: wire on the feedback capacitor is torn off; Coil connection interrupted.
- 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):
- rectifier tube closure.
- Even without a rectifier tube: on or in the mains transformer.
- 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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