31-03-2016, 06:48 PM
We move on with the Decca 94.
Had the chassis out to check it over. It looks untouched and in fine condition.
The cotton covered twin cables are in rubber insulation and in good condition, the mains lead has either changed its colour of the earth core or it was always yellow! It will have to be changed eventually.
The 2 coupling caps were changed as a matter of course, resistance checks showed no problems so it was time for the power on the lamp limiter. No problems appeared so full power and a reward of sound, cricket! Very quiet though and distorted. Voltage check on the 6V6 looked OK but cathode resistor high and bypass electrolytic useless. Changing these made little difference. With a heavy heart, swapped the output transformer and performance instantly restored. Original has shorted turns.
So its either a new one or a rewind, does anyone know what weight of copper wire is likely to be needed to rewind it?
Had the chassis out to check it over. It looks untouched and in fine condition.
The cotton covered twin cables are in rubber insulation and in good condition, the mains lead has either changed its colour of the earth core or it was always yellow! It will have to be changed eventually.
The 2 coupling caps were changed as a matter of course, resistance checks showed no problems so it was time for the power on the lamp limiter. No problems appeared so full power and a reward of sound, cricket! Very quiet though and distorted. Voltage check on the 6V6 looked OK but cathode resistor high and bypass electrolytic useless. Changing these made little difference. With a heavy heart, swapped the output transformer and performance instantly restored. Original has shorted turns.
So its either a new one or a rewind, does anyone know what weight of copper wire is likely to be needed to rewind it?
Boater Sam.
