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


Re: Philips radio set B3X00U

Geschreven door Ed van der Weele op 28. Maa 2004 21:59:03:

In reactie op: Philips radio set B3X00U geschreven door PANDU RAJAN op 28. Maa 2004 19:54:39:

Hello Pandu,

As you can see in the diagram above there is no direct connection between the external antenna and the filament circuit. The resistor of 4.7 MegOhm to ground has a far to high resistance to be of any effect on the circuit.
I think you're dealing with a mechanical problem.
If you connect or disconnect the antenna, the socket moves the entire circuitboard. If a pin of one of the valve sockets or the series resistor does not have been properly connected to the circuit board, the connection comes loose when moved and makes contact again at a later time.
You have to inspect all the pins of the valve holders at the circuit board if they are solderd properly. In doubt remove the solder, clean the pin or wire and resolder again.

Success,

Regards,
Ed van der Weele




Reacties / Answers:


Terug naar Nederlands Forum over Oude Radio's