HMV Barn Project

[Nowhere-Man]

Have you read this thread?
http://golbornevintageradio.co.uk/forum/...p?tid=4955
I posted it for people whom have trouble posting photos.
The camera used was a £99 Fuji so it is at least the same make as yours.

Editors like The Gimp are quite complicated and it will take a bit longer to find the buttons you need to use the basic functions needed to simply get the photos onto the forum.
The pictures I took for the guide I wrote were produced using a screen grabber while editing the photo.
Unfortunately the forum software removes the digital "fingerprint" of the camera from file attachments so I can't determine the model number of your camera remotely.

It's an A170 I got ages ago from Cash Converters. I think I may have another camera somewhere too that's not as good but I could try it.

I'll read the link when I can but anyway, you have the model of the camera now.

Today, I removed the potentiometer. I was extremely careful to make sure exactly what leads were taken off and where they go. The switch leads are basically 2 orange and 2 blue. One of the orange wires will go to mains live and the other to the primary. Same applies to neutral. When removing plugs, I always knot the live.

The resistance wires had me a bit puzzled and also struggling with basic Yoga. The central lug of the resistance pot basically goes via my Wima capacitor to the DDT grid. This will be the bias for the valve. I can't stress enough how hard it was tracing that wire because the valve base is swamped with components and wiring and also under the dreaded ladder. I finally got a 0 Ohm reading so that was fine.

Another wire makes its way to the Radio and gram switch.

I'm curious as to why these wires are sleeved in larger cables that internally are connected to a ground. That is, you have a black wire that runs to the grid, for example, and the outer wire it runs internally through will have its inner core grounded to some point. Some guy who claims expertise in electronics who was looking at it swears the whole thing is a short circuit caused by heat. I have to disagree as if you trace the cable in question, it opens up internally and a jumper wire runs from the second break to a ground point.

I did test for any short between sleeved and circuit wires and it is O.K.  Someone may have some light to shine on this.

Anyway my pot has 7 tags all in all and I was very careful to jot down and photograph my interventions.

Soldering seems to have been O.K. and sturdy.