Emud Volks-Super ULM W

1955

Condition and performance:

	Cabinet:	70%
	Reception AM:	60%
	Reception FM:	40%
	Sound Quality AM:	70%
	Sound Quality FM:	70%

Features:

	P.U. Entrance:	Yes
	Tape Recorder Entrance:	No
	Extra Loudspeaker Output:	Yes
	Loudness:	No
	Treble Control:	Yes
	Bass Control:	No
	Tone Register Switches:	Yes, Sprache / Musik
	AM Bandwidth Switch or Control:	No
	Tuning Indicator:	No
	Build-in Antenna:	Yes, FM Netzantenne
	Build in Ferrite or Window Antenna:	No
	Separate AM/FM tuning:	No

Technical Specifications (Partially measured):

	Tubes:	EC92, ECH81, ECL113.
	Wave Bands:	LW, MW, FM from 86.5 - 100 MHz
	Intermediate Frequencies (IF):	468 kHz, 10.7 MHz
	Loudspeaker:	Round, 17.5 cm diameter
	Resonance Frequency Fs:	?
	Frequency Range Power Amplifier:	?
	RMS Output Power at 5 Ohms:	?
	Cabinet:	Wood, brown lacquered.
	Dimensions:	40 x 30 x 20 cm
	Mains Power Voltages:	120, 220 Volts~
	Mains Power Consumption	?
	Retail Price	DM 140.00

Description:

The Emud Volks-Super ULM W is the bigger brother of the Emud Favorit UT, but the main difference is, the IF part is a regenerative (Audion) electrical circuit.
The other part is a normal IF section with Intermediate Frequencies of 468 kHz (AM) and 10.7 MHz (FM).
The detection of both FM and AM is grid detection on the ECL113.

Repairs:

Only a few important capacitors are replaced. Further reparation and examination is still required.

Before using the radio at full mains power, a lamp of 220V 60W is connected in series, to find out if the power capacitors has no short cut or leakage. All the tubes are temporarily removed, so the power capacitors could then reform. After an hour, the power capacitors seems to be OK.

Performance:

Reception of the Am broadcast stations is OK, but the reception sensitivity is too weak.
The sound quality is OK. The tone control works satisfactory and the tone switch cuts off only the highest frequencies. This is ideal to reduce the noise on weak AM broadcast stations.

Disclaimer:

The build in power transformer is only meant for the heater voltage of 6.3V~ and the different primary voltages. The high voltage supply is directly taken from the mains power, which means the radio chassis carries the 220 Volt~ mains voltage, which is very dangerous. Before making any repairs on the radio or playing the radio without the back plate, use a safety transformer with separate windings. The insulation of the windings must withstand at least 4000 Volts AC as well as a low leakage current of 0.5 mA~ or less.

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Download the schematic diagram.