07-18-2017, 05:54 AM
Looks like i have mis-wired somewhere as i have replaced all the old caps and resistors.
First 6L6 (farthest left looking from the bottom) I get:
Pin 1 - nc
Pin 2 - Should be: 6.3 vac I get: ~6 vac
Pin 3 - Should be: 290 vdc I get: ~170 vdc
pin 4 - Should be: 300 vdc I get: ~170 vdc
pin 5 - Should be: -20 vdc I get: -340 vdc!
pin 6 - nc
pin 7 - Should be: 0 I get 0 (grounded)
pin 8 - Should be: 0 I get 0 (grounded)
for the secoond 6L6 I get:
Pin 1 - nc
Pin 2 - Should be: 6.3 vac I get: ~5.6 vac
Pin 3 - Should be: 290 vdc I get: ~170 vdc
pin 4 - Should be: 300 vdc I get: ~180 vdc
pin 5 - Should be: -20 vdc I get: -0.48 vdc
pin 6 - nc
pin 7 - Should be: 0 I get ~0 (.0029 vdc) (grounded)
pin 8 - nc
And i checked out the speaker readings too. 345 dc resistance on the field coil (should be 350 dc resistance) and got 3.9 ohms dc resistance on the voice coil - so i think those are ok. However, the primary on the audio output transformer should be 375 dc resistance but I only get 212 - so i expect i may need to replace that one.
First 6L6 (farthest left looking from the bottom) I get:
Pin 1 - nc
Pin 2 - Should be: 6.3 vac I get: ~6 vac
Pin 3 - Should be: 290 vdc I get: ~170 vdc
pin 4 - Should be: 300 vdc I get: ~170 vdc
pin 5 - Should be: -20 vdc I get: -340 vdc!
pin 6 - nc
pin 7 - Should be: 0 I get 0 (grounded)
pin 8 - Should be: 0 I get 0 (grounded)
for the secoond 6L6 I get:
Pin 1 - nc
Pin 2 - Should be: 6.3 vac I get: ~5.6 vac
Pin 3 - Should be: 290 vdc I get: ~170 vdc
pin 4 - Should be: 300 vdc I get: ~180 vdc
pin 5 - Should be: -20 vdc I get: -0.48 vdc
pin 6 - nc
pin 7 - Should be: 0 I get ~0 (.0029 vdc) (grounded)
pin 8 - nc
And i checked out the speaker readings too. 345 dc resistance on the field coil (should be 350 dc resistance) and got 3.9 ohms dc resistance on the voice coil - so i think those are ok. However, the primary on the audio output transformer should be 375 dc resistance but I only get 212 - so i expect i may need to replace that one.
Andy Sorrell
Palmyra, Virginia