The EICO 150 Solid State Signal Tracer Part 6: Replacing the small value capacitors.
Wednesday, May 6, 2026 at 07:08:00
The small value capacitors in the EICO 150 need to be replaced as well. Yes, this should have been before the testing post, but…this little wereboar hasn’t had enough coffee yet, I mean I meant to do that…totally meant to do it this way!
There are three small value capacitors in this unit. Two teal-colored 0.22μF, and one gray 0.01μF. The teal parts are interstage and blocking for the meter, the 0.01 is input blocking for the RF side of the unit. While these parts seem ok, I’ve had other EICO devices where similar parts were a dead short - so they go.
Here’s the before shot:
And the after shot:
For the input blocking part, I used a film 0.01μF at 400V, same value as the original. The other parts are WIMA 0.22μF at 250V parts, similar ratings to what was there.
The one on the far left is the meter input block. It has a 10k in front of it, but I think that is probably going to have to be changed - you really need to drive this thing loud to get any noticeable deflection on the meter, and the meter is just a visual indicator, not a measurement. A mechanical eye tube, so to speak.
That’s all for the internals, next is the speaker since it’s shorted. Stay tuned!
Next part of this series: Coming soon.
Previous part of this series: https://wereboar.com … -removed-capacitors/
Wrapup and final thought: Coming soon.