Electronics > Repair

broke jumper wire?? HP 6177A. What is this failure mode?

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coppercone2:
I got the C version, and it works, and its a bit of a disappointment.

They fixed the horrible construction at the expense of the front panel. This one does not have the heli-pot decade counter on the potentiometer, and the banana's are not gold.

I think I will replace some parts between the units to get the best of both worlds.


I wonder if it was really hard to transfer the design while maintaining the price point.  ???

coppercone2:
And the C version really buzzes alot. Not the high pitched capacitor noise, but a buzz. I think its the transformer but I need to check with a silicone tube. I think it might need a vacuum varnish dip.


I also need to go through the parts list and see how many of the metal oxide resistors are compatible with the C version, to replace the old composite resistors there.. I would like to get rid of those. Looks like I need a new axial electrolytic too.

Then it needs a potentiometer swap because its kinda jumpy, transistor grease (MX4) and cleaning of all the hardware that is used for grounding + grease, and front panel banana jack replacements into gold ones.

coppercone2:
Ok, I replaced 1/2 of the parts. And its a 6181 not a 6177 now.

Anyway, it looks like it still works. I need to replace a few more capacitors, a handful of resistors.

It looks like the banana jacks on the A version are actually brass, not gold plated, so I will leave that alone.


I am tempted to try to mod the shunts with better resistors, but it looks like alot of work for unclear benefit.

m k:

--- Quote from: coppercone2 on May 16, 2024, 11:11:03 pm ---It seems kind of strange to me that a copper wire arch would just break like that.

What causes this kind of failure? Some kind of deep corrosion? strain? defective wire? its single strand BTW

--- End quote ---

If wire is cut with pliers you'd expect that surfaces are bright.
"Naturally" cut should have more matte surface, crystals decide so line is not straight and light scatters.

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