07-03-2014, 09:12 PM
I don't want to write too much.
Kirk did most of the recap.
I finished it plus the tone control rebuild.
Then there were resistors (4 altogether) out of spec badly enough.
Plus the tuning cap was propped up by pieces of wood.
Anyway, tonight I powered it and first heard nothing.
Ten minutes later I realized that the switch mounted at the back (not in the sch so I think it might be a home mod) disconnects the speaker. After that the speaker properly buzzed when grids were touched, and my local station came through.
the 6A7 is kinda weakish, as usual, but so they all, and the 75 diode-triode is very weak, both diodes do not even make it to the midle of the Red and the tiode is less than 50% of the initial value.
Tomorrow maybe will try the alignment.
PS. There is also a weird small socket at the back that connects to the last tone control cap, to the end that is switched off / on GND when the central contact touches it.
When it does it obviously is grounded.
So not sure what it is for (another home mod). Could be a headphone but it is a bad idea to do it like this.
Kirk did most of the recap.
I finished it plus the tone control rebuild.
Then there were resistors (4 altogether) out of spec badly enough.
Plus the tuning cap was propped up by pieces of wood.
Anyway, tonight I powered it and first heard nothing.
Ten minutes later I realized that the switch mounted at the back (not in the sch so I think it might be a home mod) disconnects the speaker. After that the speaker properly buzzed when grids were touched, and my local station came through.
the 6A7 is kinda weakish, as usual, but so they all, and the 75 diode-triode is very weak, both diodes do not even make it to the midle of the Red and the tiode is less than 50% of the initial value.
Tomorrow maybe will try the alignment.
PS. There is also a weird small socket at the back that connects to the last tone control cap, to the end that is switched off / on GND when the central contact touches it.
When it does it obviously is grounded.
So not sure what it is for (another home mod). Could be a headphone but it is a bad idea to do it like this.