Quote:
Originally Posted by Devon60Ben
Quote:
Originally Posted by Station X
Quote:
Originally Posted by Devon60Ben
The coil measures 3k ohms wired to pins 3&4 of the speaker socket
The output transformer is wired separately to pins 1&2 of the speaker socket
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Is the replacement speaker also of the energised type? ie no permanent magnet? |
I believe so - pics added |
It certainly looks like an energised type, but the cone leaves a lot to be desired.
With 3k rather then 1.4k in series with the HT, the HT is going to be low. What effect this will have on the anode and screen voltages of the output valve I wouldn't like to say.
You could try temporarily substituting a 1200R wire wound resistor for the energising coil. The speaker won't work of course, but you could then check the voltage across R25 to see how the anode and screen currents have changed.
Have you tried a simple buzz test? Touching the centre tag of the volume control with the metal blade of a screwdriver should give a loud buzz from the speaker if all is in order.