12-27-2018, 10:27 PM
707. Way back in the mid '60s I had an Emerson 737 (same set as 706/707 just a plain frt and no indicator lamp). It was a gift from my grandmother. Used to listen to into the wee hours in the night. Somewhere along the way it got gone. It may have been the set that the speaker caught on fire like the beginning of Bonanza. I don't remember. Have always like the little guys and would pick them up when the price was right. Have three now.
Thought it might be fun to soup it up a little by adding some gain in the front end. It's a pretty standard ac/dc set but built on a small chassis. Uses a 12BE6 for the mixer as most do. There is a tube that has abt 3X the gain which is a 12BA7. It was original designed for mixer service in FM sets but didn't get used much. It's not a drop in replacement for the 'BE6 as it has a 9 pin base.
Fortunately the tube socket hole in the Emerson chassis are large and will just accommodate the 9 pin socket but had to enlarge the screw holes to mount it in place. Made all the connections to the socket and gave it a try. Haven't realigned it yet but it works swell !!
There is a 6v 300ma octal version of the 'BA7 which is a 6SB7. It is a drop in for the 6SA7. Unfortunately there isn't a 12v octal (12SB7 )
Thought it might be fun to soup it up a little by adding some gain in the front end. It's a pretty standard ac/dc set but built on a small chassis. Uses a 12BE6 for the mixer as most do. There is a tube that has abt 3X the gain which is a 12BA7. It was original designed for mixer service in FM sets but didn't get used much. It's not a drop in replacement for the 'BE6 as it has a 9 pin base.
Fortunately the tube socket hole in the Emerson chassis are large and will just accommodate the 9 pin socket but had to enlarge the screw holes to mount it in place. Made all the connections to the socket and gave it a try. Haven't realigned it yet but it works swell !!
There is a 6v 300ma octal version of the 'BA7 which is a 6SB7. It is a drop in for the 6SA7. Unfortunately there isn't a 12v octal (12SB7 )
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
