Simpson 260 Episode 2 Resistance is Futile

There should be resistance, but there is not.

I know there are sources of precision wire-wound resistors, and I will see if I want to pay for them. But for my purposes, this meter now works perfectly.

[SDsailor]

Good job on the restoration of the Simpson 260👍

[youtuuba]

I have not viewed "Episode 1", yet can offer a couple thoughts as I watch this one:
- There is no such thing as a "Simpson 260 schematic". The 260 has been produced for a LONG time in quite a few versions, or 'Series'. There are significant variations in the circuits of the various series, and Simpson's drafting department was often not clear about which series a particular schematic goes with, and this can be very confusing.
- I my own experience restoring various 260's, including the original/earliest version, I found MANY mistakes on the Simpson schematics. I know that within each Series/version Simpson made changes during the production runs, and my guess is that they also had versions of the schematics that would match all the variations, but I have never found a positive way to definitively match a Simpson schematic with a specific example of a 260; Simpson seems to have been less than professional in their documentation, otherwise they would have included serial number ranges or something on each schematic version/revision, or some equivalent scheme.
- I have seen Simpson 260 schematics that, for example, identify resistors in the M Ohms as the same value without the 'M', e.g. a 2.4M resistor would be shown as a 2.4 Ohm resistor on the schematic, and clearly that would be a mistake and not due to some incremental variation.

[JohnDoe-jnex]

Love my 260. Buddy of mine got it at a yard sale and gave it to me.

[steelcitypb]

Hi,
Liked seeing this video very much. I too have “refurbished” a few analogue meters in past years. When I say “refurbished” I do so loosely. First of all I never had any standards equipment, so accuracy, or “factory accuracy” could not not be achieved on all ranges. Also, achieving resistor accuracy was often a time consuming effort. Having selected, and measured the value of several resistors to arrange in parallel, and/or series to make a specified value of one resistor never makes a decent looking job. For example, one of my AVO (model 8, mark 3) meters works exceptionally well, and its outward appearance looks virtually new, but internally it looks hideous with several resistors made up from loads of resistors that are both in parallel and series arrangement.
I own four AVO model 8, mark 3 analogue meters: they were once used in industrial factories by technicians, and engineers. That model of meter is often quoted on most British radio and television circuit diagrams as being the meter used to clarify amperes, voltages, and ohms - hence the brand name AVO.
All the best, Phil

[raymondedge]

Why is there heat shrink around the resistors?