Hi Jose,
It looks like the power supply isn't regulating properly and has
ripple on it.
I'd check the supply lines for ripple if you've got another CRO. Probably
either voltage set too high, weak electrolytics or regulator tubes.
Sorry, I don't have the schematic.
Don Black.
"JOSE V. GAVILA (EB5AGV/EC5AAU)" wrote:
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Hello!
I have been cleaning the 545B/1A1 and now it shines :-)
Then I have connected it and I have got a curious trace; I have put a
picture of it at:
Center line is Channel 2, connected to GND. The other lines should be a
calibrator signal on Channel 1.
As you can see, the trace goes back and is distorted. It is synchronized
with LINE, so it seems as a power supply filtering trouble. But as I have
no manual nor schematics, I can't work on this easily. Do you have any hint
for this trouble?. Also, if somebody could scan the schematics (or at least
the power supply section) of the 545B it would sure help a lot!
Regards,
JOSE
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73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN)
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