B&K
700-707
SS #83
CONVERSION
Converting the #83 tube to Solid State using 1N4007 Diodes / Fused for protection
(the easy way)
Converting the #83 tube to solid state is a pretty straightforward and easy affair. Some try to make it sound like
rocket science but it is not. With the right components, you can solder a fused assembly to the backside of the #83
socket with ease. The specified vishay resistors combined with the 1N4007 diodes (twisted together as shown)
provide a solid mount for the fuse holder that will not cause issues later. This mod is a MUST. Drastically increases
reliability AND protects your transformer if things go wrong!
Step 1:
Remove the big ugly #83 tube from its socket
Step 2:
Solder the anode (black end) of each diode to the wires closest to the heater selection rotary switch. These should
be the SMALL diameter socket pins on the #83 socket. I have never seen a socket mounted upside -down but it is possible
so pay attention!
Step 3:
Solder each 10R resistor to the top two pins furthest away from the heater selection rotary switch.
Step 4:
Twist the diode leads together and clip off excess. Then, do the same to the resistor leads.
Step 5:
Solder the fuse assembly as shown. Connecting the diode pair to the resistor pair. Make sure solder flows into the
twisted part of the diode and resistor leads. This will provide a very solid structure for the SS conversion.
That
’s it! DONE!
Recommended Parts for the #83 SS conversion:
- 2qty Diodes
P/N: 1N4007
- 2qty Vishay CPF series 10R resistors
P/N: CPF310R000FEE14
- 1qty 200mA fast blow fuse
P/N: BK/GMA-200-R
- 1qty 5x20mm PCB fuse holder
P/N: 64600001003
