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In Tektronix (and I'd assume HP as well), some of the power supply decoupling networks were made of fine wire wound on a convenient resistor (say 10 ohms).? They're easy to repair, just match the wire gauge, and wind.? One or two extra turns will not make too much of a difference in a decoupling network.

Harvey

On 11/6/2021 11:43 PM, Richard Merifield wrote:

OK, I replaced the Black Cat capacitors C8 & C9, both could hold 0.5uf but had an ESR of around 12 Ohms ? seems high?. Anyway, after replacing them I have a working 200CD after adjusting the amplitude as it appeared to be clipping.

However, several of the voltages are still off and R30 is still scorching hot.

I removed the little PCB that holds C8/C9 (what a task that was) and the associated circuitry after noticing this is where the voltages are definitely different one side to the next suggesting something may be an issue. L2/L3 voltages were substantially different. I pulled L2/L3 and L2 is an open circuit, I can see the tiny wire has broken at one end. So, question is what modern component could I use to replace both L2/L3 ? Again, my lack of understanding is showing but can I use an axial choke ? I am actually wondering if I could repair the wire somehow also.

Regards

Richard