I have a Hickok 800K that I'm getting back into working condition.
It has a sticker nothing that it's "factory wired - 600A circuits".
The paper roll is removed in this picture as I was cleaning the contacts on the switches and didn't want to damage it.
The power cord was in awful condition
It looked even worse on the inside...
I had desoldered the hot wire before I took this. Heaps of the insulation fell off! The white insulation initially looked burnt to me, but I think it was just pay of the deterioration.
A bit of prodding around revealed a broken wire connecting (or not connecting) to the transformer.
That's an easy fix
Pretty sure this was a hidden fault, the gap was nowhere as large as shown in the first image.
Only a couple of capacitors. One across the meter
That's a polarised 50uF 6V capacitor.
Replaced with a 47uF 63V capacitor. The original measured well over 100uF, most likely due to the leakage resistance in the order of a couple of MΩ.
And another one
This one is a 0.05uF 400V capacitor.
Replaced with a 47nF 630V capacitor.
There are some other caps, but they already to be mica, so they can remain for the moment.
I thought these were capacitors at first
But these are resistors. Precision resistors? Anyway, they measure pretty damn close to their markings.
This wire was moved up and away from the wire under it, and the transformer terminal below it. It looks like the wire under it was almost shorted (the insulation seems melted) and there was no visible has between it and the terminal. This may have been the second possible fault in the ddevice
The transformer primary reads about 15Ω, which is about what I expect. The 2 tubes look good, but they're only rectifiers, so I could replace them if necessary.
Next step is to grab my auto transformer and dim bulb tester to see what's happens...
It has a sticker nothing that it's "factory wired - 600A circuits".
The paper roll is removed in this picture as I was cleaning the contacts on the switches and didn't want to damage it.
The power cord was in awful condition
It looked even worse on the inside...
I had desoldered the hot wire before I took this. Heaps of the insulation fell off! The white insulation initially looked burnt to me, but I think it was just pay of the deterioration.
A bit of prodding around revealed a broken wire connecting (or not connecting) to the transformer.
That's an easy fix
Pretty sure this was a hidden fault, the gap was nowhere as large as shown in the first image.
Only a couple of capacitors. One across the meter
That's a polarised 50uF 6V capacitor.
Replaced with a 47uF 63V capacitor. The original measured well over 100uF, most likely due to the leakage resistance in the order of a couple of MΩ.
And another one
This one is a 0.05uF 400V capacitor.
Replaced with a 47nF 630V capacitor.
There are some other caps, but they already to be mica, so they can remain for the moment.
I thought these were capacitors at first
But these are resistors. Precision resistors? Anyway, they measure pretty damn close to their markings.
This wire was moved up and away from the wire under it, and the transformer terminal below it. It looks like the wire under it was almost shorted (the insulation seems melted) and there was no visible has between it and the terminal. This may have been the second possible fault in the ddevice
The transformer primary reads about 15Ω, which is about what I expect. The 2 tubes look good, but they're only rectifiers, so I could replace them if necessary.
Next step is to grab my auto transformer and dim bulb tester to see what's happens...