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FERNSEH · 21st Jun 2018, 3:48 pm

Hi Andy,
I've been tracing the system switch circuits and there are differences in the DR101 compared with switching circuits in the DR31. For starters there are no connections to the system switches SW3 and 6 from pins 6 and 7 of the B9A plug.
Also, the 0.25uF capacitor C65 can't be found.

In the DR101 pin 7 of the B9A plug goes direct to the HT reservoir capacitor C64 and pin 6 goes direct to the HT smoother C66. Pin 2 of the B7G plug goes to a 600 ohm 5watt resistor which must supply one of the sub-HT lines in the receiver.
A full service manual is needed for this set.

Now the set is stuck on 625 lines. I can report the set works very well on 625.

DFWB.

21st Jun 2018, 3:48 pm	#31
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Decca DR101 dual standard TV Hi Andy, I've been tracing the system switch circuits and there are differences in the DR101 compared with switching circuits in the DR31. For starters there are no connections to the system switches SW3 and 6 from pins 6 and 7 of the B9A plug. Also, the 0.25uF capacitor C65 can't be found. In the DR101 pin 7 of the B9A plug goes direct to the HT reservoir capacitor C64 and pin 6 goes direct to the HT smoother C66. Pin 2 of the B7G plug goes to a 600 ohm 5watt resistor which must supply one of the sub-HT lines in the receiver. A full service manual is needed for this set. Now the set is stuck on 625 lines. I can report the set works very well on 625. DFWB.