I used the modifications suggested in the You Tube linked at the bottom.
While I need my Ziff sockets and a switch, this is easier to pull out than the BK 501A.
I used an OP937F for the vertical amplifier from the original board. This (with the calibration pot) makes 1mV equal 1mA. I need to play with the capacitor on the amp board to get rid of the tail.
I will have two Ziff sockets to A/B; and each ZIFF will be set up to do EBC and ECB (front and rear locations).
As you can see, it draws very little power; a total of 50mA. I want to protect the ckt on the secondary side of the power supply. Either 200mA fuses or a current limiter.
In order to get rid of the BNC cables and connectors, I sacrificed 2 Siglent probes (I use Teledyne 10X) which will be permanently attached to the unit (sorry TauTech).
As you can see, stray capacitance and noise are not an issue. Even when I use 150MM test clips. The trace on the Siglent is teriffic and more refined on the CRT.
Excluding the cost of the lab, I thnk I have $125 into it. Or a complete cost of around $5125.
Everything uses some form of quick disconnect to facilitate future mods and service. I am using a Jameco PSU for permanent power.
This is limited to a max of 15V transistors. Also, for some reason, the hi current output is an odd multiple of the low current power. I may change it to 10X.
Thanks to Tautech for teaching me how to use my scope; Tooki for helping me to improve my crimping, and especially the guy who made hot glue a tool.
I plan to document all voltages and traces. It seems there can be problems with the basic kit. But it can work.
The pics show the performance after being on all nite (accidentally). So it is stable. NPN, low power.