0 - 10 makes up 11 numbers I'm thinking the plastic box, you could get some decent 0.1% 1206 SMD resistors of 1 * 10^n, and use 2 of the next range up in parallel for 5 0.1ohm range not necessary useful by itself, but can be helpful if you have 52 ohms dialled in but you wanna see if 52.4 ohms would get something spot on; or the tolerances means that to get 52 'true' ohms, you actually need to dial in 51.8 on the box
Using 2 in parallel for 5 is a good idea, and reduces the parts BOM. But I'd use TH parts for their power rating, and there's room for them. I take your point about getting spot on (that's what substitution boxes are all about). But these switches are too crappy for even 1R minimum, so I'd still shift everything up by two decades.
Yeah, it's pretty bad. But if modified as I suggested, (10R..1M), it might be OK as a simple substitution box - depending on how well those PCB contacts hold up. Still in a crappy box though...
I haven't seen "Made in England" very much since the 1960's. This thing would be quite old, probably from the 1970's, so well before "Made in China" was a thing. That's what I'm hoping anyway...
@@bertoid I commented before you opened the box and when I saw those rotary switches I could see they were obviously not off the shelf parts made in China.
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Excellent work Bertoid!
Thank-you kind sir!
Resistance boxes are like bench powersupplies, you can't never have to much of them.
That seems about right!
0 - 10 makes up 11 numbers
I'm thinking the plastic box, you could get some decent 0.1% 1206 SMD resistors of 1 * 10^n, and use 2 of the next range up in parallel for 5
0.1ohm range not necessary useful by itself, but can be helpful if you have 52 ohms dialled in but you wanna see if 52.4 ohms would get something spot on; or the tolerances means that to get 52 'true' ohms, you actually need to dial in 51.8 on the box
Using 2 in parallel for 5 is a good idea, and reduces the parts BOM. But I'd use TH parts for their power rating, and there's room for them.
I take your point about getting spot on (that's what substitution boxes are all about). But these switches are too crappy for even 1R minimum, so I'd still shift everything up by two decades.
The switches in the black box are a joke. I have a Siemens decade resistance box and after 30 or so years the switches are still solid...
Yeah, it's pretty bad.
But if modified as I suggested, (10R..1M), it might be OK as a simple substitution box - depending on how well those PCB contacts hold up. Still in a crappy box though...
Made in England with Chinese parts...LOL
I haven't seen "Made in England" very much since the 1960's.
This thing would be quite old, probably from the 1970's, so well before "Made in China" was a thing.
That's what I'm hoping anyway...
@@bertoid I commented before you opened the box and when I saw those rotary switches I could see they were obviously not off the shelf parts made in China.