Philips main transformer for BX696A (Algemeen)

door Pandu Rajan , 22.05.2021, 10:14 (1060 dagen geleden) @ Robert Gribnau

Dear Mr. Robert
Thanks for your reply

I have done the following measurements.
a. On Load the voltages are Pri. 225V a.c., Sec- 272-0-272 at the 220V tap
Filament voltage - 4.06V and 6.23V
D.C. voltage at C1-297V and at C2- 257V
the voltages are with the set working.

b. The no load voltages with only the transformer energised
Pri. 223V a.c., Sec.- 280-0-280
Filament Voltage - 4.22V, 6.52V

c. The measured D.C. resistance of the transformer BX696A- Pri -25.2 ohms and Sec 195 ohms whereas the service manual gives values of 15 ohm and 150 ohm respectively.

d. In the set BX695A the values are 50 ohm and 300 ohm and in the set BX704A the values are 15 ohm and 180 ohm respectively.

Lower the values of the resistance means they are designed for higher current.

So on load also the voltages are high.

Regards
P.Rajan