Nederlands Forum over Oude Radio's
Onafhankelijk medium voor liefhebbers en verzamelaars van oude radio's en gerelateerde zaken


BAND - PASS FILTER IN VALVE SETS

Geschreven door PANDU RAJAN op 26. Okt 2004 20:57:17:

Dear Friends

I have observed that the following type of condensers have been used in the valve IF transformers in PHILIPS Radios

1. In the old sets 115pf condensers were being used in both the IFT's.
2. In the plano type of sets the values were a follows:
a) 110pf & 195pf in the 1st IFT and 195PF/195pf in the 2nd IFT.
b) 195pf/195pf in both the IFT's
c) 110pf in the primary and 195pf in the secondary of both the IFT's

What changes in the performance it causes by using these different values? Can these be interchanged? What is the D.C. resistance of these windings?
Has any Band width control was being used in any of the plano type of sets? Which are the Plano type of models in which Bandwidth control has been provided? In all the above cases the frequency changer valve is ECH81 and the IF amplifier is EF89/EBF89.

I shall be grateful if somebody can provide me with the above information

Thanks

P.RAJAN




Reacties / Answers:


Terug naar Nederlands Forum over Oude Radio's