Tar Capacitors used in Philips vintage Radios

Dear Friends

In the service spare parts book the code no and the voltage rating of the black tar capacitors have been given as follows:

1. 48.750.10 - 125V
2. 48.751.10 - 400V
3. 48.752.10 - 600V

But there is no details of the type 756, 757 and 758. Can anybody help me in this regard i.e. voltage rating and any special feature? Against type 757 it is just mentioned that it is loudspeaker capacitor.

Regards

P.Rajan

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Hello Mr. Rajan

1st letter: max. voltage
L = 125 V
no letter = 400 V
H = 600 V
S = 800 V
T = 1000 V

Followed by the capacity in pF or µµF (e.g. 56K= 56000pF = 0.056µF)

Followed by the tolerance
A = +- 10 %
P = +- 20 %

A capacitor with the markings: S 10 KP 5.1 means: 0.01µF , 800V, 20%.

The 5.1 is a factory batch code of no interest.

kind regards, Wolfgang

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Dear mr Wolfgang

Thanks your reply. But many times the markings on the capacitor gets erased and then we have to consult the schematic and the service manual. In the service manual the code is given in the form 48.750.10/ 10k. The meaning of 750 is given as 125V and 10k mans 10000pf. Similarly for 751 it is 400V and for 752 it is 600V. But nothing is mentioned about 756, 757 and 758. I wanted the details for these.

Regards
P.rajan

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Generally spoken you can assume, that capacitors in the rectifying circuit are save at 600 Volt unless they are anti-rattle capacitors where you take 1000 V. ones. Further more capacitors that stand directly in the anode circuits of the tubes 400 - 450 V. is safe and in other places you may safely take 125 V. ones. Understanding of the different functions in the circuits makes it clear what values you have to take - it's a matter of common sense, that is plenty available in your case so to see.

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I can't help on the details, unfortunately, but this is what I have in my database:

48 750 10/# papiercondensatoren niet afgeschermd 125V 10%
48 750 20/# papiercondensatoren niet afgeschermd 125V 20%
48 751 10/# papiercondensatoren niet afgeschermd 400V 10%
48 751 20/# papiercondensatoren niet afgeschermd 400V 20%
48 752 10/# papiercondensatoren niet afgeschermd 600V 10%
48 752 20/# papiercondensatoren niet afgeschermd 600V 20%
48 753 10/# papiercondensatoren afgeschermd 125V 10%
48 753 20/# papiercondensatoren afgeschermd 125V 20%
48 754 10/# papiercondensatoren afgeschermd 400V 10%
48 754 20/# papiercondensatoren afgeschermd 400V 20%
48 755 10/# papiercondensatoren afgeschermd 600V 10%
48 755 20/# papiercondensatoren afgeschermd 600V 20%
48 757 10/# luidsprekercondensatoren (papier) 10%
48 757 20/# luidsprekercondensatoren (papier) 20%
48 758 10/# speciale luidsprekercondensatoren (papier) 10%
48 758 20/# speciale luidsprekercondensatoren (papier) 20%

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48 757.xx = paper condenser without tubing 800V
48 758.xx = paper condenser without tubing 1000V

Adrie

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Value off capacitors can be found first at the component it self.
Then if not readable you go look for simulair components in the equipment and see
if you can find simularity codes.

Or look for same parts in simmulair make and models of that year.

Then the schematics to determine the Voltage range.

For your type 48 75x look at this document.
Philips condensatoren 1947 pdf, at the NVHR.NL schematic database.

The document "Philips Condensatoren_1953 - Hoofdstuk H.pdf"
Mentioned that the Cancelled Paper Condensers are;
"48 750 10/.. , 48 750 20/.. , 751,752,757,758

So that narrows the search to documents befor 1953 to find Data of those Paper Capacitors.

In that document is mentioned that the cancelled capasitors in
BLACK should be replaced by service code A9 999 06/.. with a working voltage of 400V,
RED should be replaced by service code A9 999 06/V.. with a working voltage of 1000V,
( The code A9 999 06/.. stands for PAPER CONDENSORS)

[image]

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An other thing to mention when replacing condensors (and other parts)

The range of production components is alway's greater than that of service parts.

The fact of costs per component to held in stock or when in production.

fi a 125V capacitor is a bit cheaper than one of 400V (just cents) but in great numbers
it counts.

When in service you just have in stock the 400V and 1000V type that covers the 95%
fi. when replace a 125V you use a 400V.

Same in tolerance, when mentioned 20% tolerance you use 10% service parts that are available.

Even so in value's the service range is reduced.
In service you therfore sometimes have to combine value's (series or parr) to get the value needed.

That is why the limited datasheets of service parts don't cover the large range of
production codes.

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Dear members

Thanks to every one for a detailed reply. The only condenser which is missing is the type 756. Since this type of capacitor was used as a ratchet condenser in many sets of late forties I presume that the voltage of this capacitor should be 1000V

Thanks once again .

Regards
P.rajan

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Or possibly 1300V if I translate ratchet loosely to rattle (which is English for the Dutch word ratel).

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in een omcoderingslijst kom ik bij de reeks 48 756 xx maar één condensator tegen, de 48 756 20/22k, een 22nF condensator dus. Oud nummer is 49 129 90. Deze condensator is o.a. gebruikt in de 204U en 208U , C110.

Adrie-

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In de documenten van de 208U/05 die van de NVHR-site zijn te plukken, staan verschillende nummers voor C110. Op de documentatiekaart staat dat C110 de code 48 758 10/22K heeft. Dit klopt met de kop boven de omzettingslijst, omdat daar geen 48 576 voorkomt. Verder wordt in het servicedocument C110 aangeduid met 49 126 50.

De codepuzzel is nog niet opgelost.

Hans

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