On Fri, Apr 29, 2022 at 07:34 PM, Stephen wrote:
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Anyways, the problem I¡¯m facing concerns the horizontal amplifier. For
starters, the trace is always moving a bit right and left. Also, it is just
impossible to adjust the timing. It¡¯s completely off even with the X1 and
X10 all the way CCW. It¡¯s still way to wide. I replaced what I found to be
out of spec, but there is still no change.
I haven¡¯t measured the 30K and 18K 8W precision resistors though¡
Hi Stephen,
[I didn't (re)read the whole previous repair story.] Are you sure now that the sweep generator itself is not the problem? If A and B sweeps show the same problem then the problem is likely further on in the horizontal chain. To be sure you can use another scope with 10X probe to observe the waveform at the "A Sweep" front panel bus. That signal immediately follow the Miller circuit. In my 547 the sweep duration is about 10.5 ms (as should be) with amplitude about 90 V while the dead time between sweeps is about 2 ms. That's with the 547 at 1 ms/div and VAR in calibrated position, fully CW. The sweep time increases (up to 2.5X or so) when VAR is rotated CCW.
Here¡¯s a short video of a 1KHz from a Type 184. You can clearly see the
trace moving right and left, as well as the timing being off, and I can¡¯t
adjust it any further.
Any help would be appreciated.
Albert
