Blaupunkt Sultan 2520

1955

Condition and performance:

	Cabinet:	60%
	Reception AM:	70%
	Reception FM:	70%
	Sound Quality AM:	70%
	Sound Quality FM:	70%
	Sound Quality P.U.:	70%

Features:

	P.U. Entrance:	Yes
	Tape Recorder Entrance:	Yes
	Extra Loudspeaker Output:	Yes, 5 Ohms
	Loudness:	Yes, only on bass
	Treble Control:	Yes
	Bass Control:	Yes
	Tone Register Switches:	Yes, Hi-Fi, Solo, Sonor
	AM Bandwidth Switch or Control:	No
	Tuning Indicator:	Yes, EM84
	Build-in Antenna:	Yes, FM only
	Build in Ferrite or Window Antenna:	No
	Separate AM/FM tuning:	Yes

Technical Specifications (Partially measured):

	Tubes:	ECC85, ECH81, EF89, EABC80, EL84, EM84.
	Wave Bands:	LW, MW, SW from 16 - 50 meters, FM from 87.5 - 101 MHz
	Intermediate Frequencies (IF):	460 kHz, 10.7 MHz
	Loudspeaker:	Blaupunkt LA739/5z
	Tweeters:	2 pieces LSH 518 b, Electrostatic.
	Resonance Frequency Fs:	?
	Frequency Range Power Amplifier:	?
	RMS Output Power at 4 Ohms:	?
	Cabinet:	Wood, brown lacquered.
	Dimensions:	54 x 35.5 x 23,5 cm
	Mains Power Voltages:	?
	Mains Power Consumption	?
	Retail Price	?

Description:

The Blaupunkt Sultan 2520 is a standard radio. It is built very well, but one important part which is missing, is a ferrite antenna for the LW and MW reception. Luckily the sensitivity is well, so LW, MW and SW reception is possible with the build in FM antenna.
Another part is the addition of the tone register switches. For example, the sonor switch adds the low-mid frequencies, which results in a more full male voice reproduction.

Repairs:

10 nF coupling capacitor between the EABC80 and EL84 is replaced.
Reason: There is 2 Volt grid voltage on the EL84, which can lead into destroying the EL84, output transformer and power supply due to the too high current of the EL84.
Loudness capacitor of 10 nF is replaced.
Reason: Only a little bass reproduction. Now the radio has a more full sound.

Further repair isn't done and the radio is sold in 2003. The most critical components are replaced.

Performance:

After repair, the radio plays quite well. The sound is a more neutral sound and lacks in the highest frequency reproduction, even with the use of 2 electrostatic tweeters.
For a good Am reception, a good antenna is required.

Home
Back to Picture Gallery 2
Contact Kees van Dijke
Download the schematic diagram.