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B&K Precision 2120C Analog Oscilloscope. Model: 2120C. 2120C Analog Oscilloscope 30 MHz, Dual/Single Trace. B&K Precision PR 33A 90 MHz Scope Probe. B&K Precision's model 2120B is a dual trace oscilloscope that offers high performance at a low price. Most competitor's entry level oscilloscopes have a 20 MHz. B&K Precision's model 2120B is a dual trace oscilloscope that offers high performance at a low price. Most competitor's entry level oscilloscopes have a 20 MHz bandwidth, while B&K Precision's models 2120B has a bandwidth of 30 MHz. B K PRECISION 2120 ATOMTUBES. Mjlorton 35,989 views. BK Precision 2120 Oscilloscope - Duration.

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Everything you need to worry about should be under 300V, 260V is the highest my 2120 has apart from the HV to the tube. Checking your power rails is one of the first steps of troubleshooting. If you have a supply problem then there can be all kinds of weirdness. I don't know how similar yours is, but on my 2120 the sweep circuit needs quite a few rails, the +5V, +/-12V and +24. You can isolate the sweep circuit from the CRT horizontal drive circuit.

Put the scope in X*Y mode and apply a voltage to the channel 1 input. In X*Y there is no sweep.

The dot should move right or left depending on whether it is + or - and should not move vertically. If you center the dot and set the scope to 1V/div and apply -5V to the input the dot should move all the way to the left without moving vertically, +5V will make it go right. If this all seems normal than the problem is in the sweep circuit, not the CRT horizontal drive. If the dot moves vertically at all on channel 1 then it is a CRT horizontal drive problem. You can repeat the same test on channel 2, however the dot should move vertically. If there is no movement then that channel is dead. The channel 2 problem was likely operator error, might have blown the vertical amplifier circuit on that channel.