SB-230 First Prototype
With A Conduction Cooled GI-7B
This particular SB-230 had been previously modified in an attempt to put a different tube in it. Pictures of an original condition SB-230 will be posted later.
1
A 5/8" hole is drilled in the right rear corner. This view is from the under side. A half inch grommet goes in this hole.
2
View of the filament transformer with a few added turns.
3
The corner where the socket is going to be mounted. You can see the grommet in the hole.
4
Under side of the right rear corner.
5
The old chokes are removed from this terminal strip.
6
Using a template to drill the holes to mount the socket.
7
Here the socket is mounted with a tube in it.
8
Here is the terminal strip in the corner.
9
Old chokes and components removed from the right rear corner on the under side.
10
The thermal transfer block is on the tube and clamped up to the white BeO block
11
Here is another view of the socket and block.
12
This is the filament transformer with its added turns.
13
Bias board mounting.
14
Terminal strip mounted for the cutoff resistor.
