If you ever get some time left it would be very kind if you could take some nice photos of the PCB of your DC-106A module, but you'll have to unscrew at least 8 screws to be able to remove the PCB from the unit, four for the BD301 and four for the PCB. I'm interrested in seeing if your module is like any of mine. I can see one difference form your photos and that is how the 150K resistors on the BD301 socket are connected, mine ar straight whereas yours are lying down sideways so a photo of that socket will also help me. The circuit diagrams for all of the different Burroughs modules are similar to the VS10G diagram but they differ in how the flip-flop is connected and also how the reset circuit is connected. These circuits differ since the modules were made for different speeds, 110KHz and 1.1MHz plus the requirements for driving them in chains also differ between the DC-105 and DC-106 modules. I haven't looked inside the different tubes from different manufacturers to see if there are any differences or if they all were manufactured by Haydu/Burroughs. /Martin
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