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Spezialsuper 51 SB502GW

Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25393) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25394) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25395) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25396) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25397) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 25398) Radio
 
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 6758) Radio
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 90378) Radio Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 90379) Radio
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 90380) Radio Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 981) Radio
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501225) Radio Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501226) Radio
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501227) Radio Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501228) Radio
Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501229) Radio Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 501230) Radio
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Spezialsuper 51 SB502GW; Siemens; D S.& (ID = 90378) Radio
Siemens; D S.&: Spezialsuper 51 SB502GW [Radio] ID = 90378 933x607
Select picture or schematic to display from thumbnails on the right and click for download.
For model Spezialsuper 51 SB502GW, Siemens; D (S.& Halske / S. Electrogeräte):
SB502GW 2.jpg
 
Country:  Germany
Manufacturer / Brand:  Siemens; D (S.& Halske / S. Electrogeräte)
Year: 1950/1951 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: UCH42 UAF42 UAF42 UL41 UY41
Main principle Super-Heterodyne (Super in general); ZF/IF 468 kHz
Tuned circuits 6 AM circuit(s)
Wave bands Ready for FM, has Broadcast, Long Wave, Short wave.
Details
Power type and voltage AC/DC-set / 110, 125, 220 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 17 cm = 6.7 inch
Power out
from Radiomuseum.org Model: Spezialsuper 51 SB502GW - Siemens; D S.& Halske / S.
Material Bakelite case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 550 x 300 x 220 mm / 21.7 x 11.8 x 8.7 inch
Notes Hergestellt im Berliner Werk. Vorbereitet für UKW-Einsatz U2GW (siehe dort).
Net weight (2.2 lb = 1 kg) 6.5 kg / 14 lb 5.1 oz (14.317 lb)
Price in first year of sale 210.00 DM
Collectors' prices  
Source of data Kat.d. Rundf.Gr.Handel 1950/51 / Radiokatalog Band 1, Ernst Erb
Circuit diagram reference Lange-Nowisch
Picture reference Das Modell ist im «Radiokatalog» (Erb) abgebildet.


All listed radios etc. from Siemens; D (S.& Halske / S. Electrogeräte)
Here you find 2378 models, 1949 with images and 1241 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Siemens; D S.&: Spezialsuper 51 SB502GW
Threads: 2 | Posts: 15
Hits: 1130     Replies: 13
siemens: to much current
Perica Adnadevic
18.Jul.16
  1

Hello dear friends,

I have quite unusual problem with this apparatus.

Just to mention, I have quite experience with old radio restoration and reparation.

Problem with this radio at start was completely destroyed power supply section, do to previously reparation atempts.

It was all misconnected, but with diagram I downloaded from our Radiomusem site, it was quite easy to correct all misconnections, but!!! after I resoldered and checked all connections, after switching on, on referent point where it should be -9.1V, I measured -20V, and output tube anode start to glow, all other voltages were too low, and minus g1 was -3.6V (see picture). So I started to check again resistors and capacitors arrangement, replaced UL41, tried another output transformer etc..., but nothing happened, too much current flows, and quite simple problem is now headache....

Does anybody have an idea?

Thanks in advance, Peter.

Attachments

Roy Johnson
07.Aug.16
  2

Hello Perica.

It looks as if the bias is too low on the UL41.  3.6 is too low.

This is derived from the series 110 and 23 ohm resistors in the negative supply.

This low voltage would occur if the 0.25uF filter capactor to the junction of the those two resistors were leaky or shorted.  I suggest that you check this first.

Regards,

Roy

Jacob Roschy
08.Aug.16
  3

Hello Perica,

there is a big chance that the 10 nF capacitor between anode UAF42 and control grid g1 of the UL41 is leaky. What happens, if you disconnect this capacitor ?

Best Regards,
Jacob 

Roy Johnson
08.Aug.16
  4

Hello Perica,

Presumably you have checked or replaced the UL41 with a known good one?

The UL41 often develops internal leaks to the grid from the high voltage electrodes.

Only the UL41, the 10nF that Jacob suggests or the 0.25uF can be the cause.  Hopefully your new wiring is correct!!!!!

Good luck,

Roy

##############

Perica Adnadevic
09.Aug.16
  5

Hello Roy,

thanks for suggestions, but I already replaced all capacitors and all resistors with signs of overheating, tried another UL41(also used one), filter capacitors, output transformer, and nothing changed...

This is so simple radio, simple bias circuit, but still doesnt work as it should be, I mean it works, but with so distorted sound, and UL41 anode overheating...

Regards, Perica.

Perica Adnadevic
09.Aug.16
  6

Hello Jakob,

thanks for suggestion, but, as I wrote to Roy, all capacitors were replaced before first start, and the problem persists...

Regards, Perica.

Perica Adnadevic
09.Aug.16
  7

And yes, new wiring is correct,

I checked few more times...

Thanks Roy!

 

Daniel Consales
09.Aug.16
  8 To get -20V at the measuring point there must flow about 150mA instead of about 68mA (9,1V/(110+23). So perhaps there is a short in the selection-switch for 110/125/220V at the anode of the UY41 ?
Jacob Roschy
09.Aug.16
  9

Hello Perica,

anyway there is an undesired voltage drop across the 100 + 800 kΩ grid resistors.

As you replaced the capacitors and the UL41 itself, there is the chance that the UL41 socket has a leak between the g1 and the g2 connections.

Or both of your UL41s are bad, as this type has the inclination to develop internal leaks, as Roy already told.

Best Regards,
Jacob

Roy Johnson
09.Aug.16
  10

Hello Perica.

Since you have eliminated most components, I suggest:

1. Short circuit the 800k Grid resistor on the UL41.  If the high current still exists, measure the grid voltage with the short still in place.

IIf the high current still exists repeat with the other UL41.

2. If the current falls to normal levels the fault must be leakage to the grid either IN the UL41 or, as Jacob suggests, the tube holder.   Check this visually for any blacking or this tracks from the g1 pin.  If in any doubt replace the socket.

3. If the current is still high, check that the output transformer does not have a leakage to ground.

Let us know!

Regards,

Roy

Perica Adnadevic
13.Aug.16
  11

Hello Jakob,

on the end it was the socket....a thin burned canal in the pertinax between g1 pin and chassi...

Thanks so much for the idea...

Perica Adnadevic
13.Aug.16
  12

Hello Roy,
I tried everything You suggested, and  on the end it was the socket...
Thanks again for all practical advices.
Sincerely, Perica!

Perica Adnadevic
13.Aug.16
  13

Hello Daniel,
I checked, and all switch contacts are in good order, on the end UL41 socket was burned.
Thanks, Perica.

Jacob Roschy
16.Aug.16
  14

Hello Perica,

there was little left what could be the cause !

Using pertinax sockets on tubes becoming that hot as E/UL41s or E/UL84s was never a good idea !

Regards, Jacob 

 
Hits: 805     Replies: 0
siemens: Re: to much current
Tomasz Szczesniak
18.Jul.16
  1

Replace 10nF capacitor between UAF42 anode and UL41 grid. It has too big leakage current

 
Siemens; D S.&: Spezialsuper 51 SB502GW
End of forum contributions about this model

  
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