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The ultimate analog power meter :)
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https://simpson260.com/downloads/simpson_260-7_and_7m_user_manual.pdf
depends on the range, and possibly the series but it looks like the 2.5vac range is flat out to about 50 khz. 10v is slightly worse but still should be plenty fine for audio work. The 50v also would probably be OK but accuracy at 20khz is down a bit.
response plot on page 17 of the manual
Thanks @gadget73. That's an impressive frequency response for the 5 volt range. I have forgotten what my digital meters AC frequency capability are.
I remember the Simpson meters from my childhood days in the '60s. Seems like that was the brand to get. They were pricey for the hobbyist. So I got myself a Lafayette multimeter relatively cheap. The Lafayette had the V and V/2 switch to extend the number of ranges, but also halves the ohms/volt spec respectively.
The new digital meters of the '70s had Fluke brand being popular, at least in the research/scientific areas.
I remember the Simpson meters from my childhood days in the '60s. Seems like that was the brand to get. They were pricey for the hobbyist. So I got myself a Lafayette multimeter relatively cheap. The Lafayette had the V and V/2 switch to extend the number of ranges, but also halves the ohms/volt spec respectively.
The new digital meters of the '70s had Fluke brand being popular, at least in the research/scientific areas.
mind you I don't know if all of the series have that same response, I just happen to have a 7 series. Honestly I didn't realize it was that wide either. I also have a 5 series, but slightly prefer the 7. It has a 1v range which is easier to use for setting bias than the 2.5v range. Advantage to the 5 though, it uses common banana jacks instead of those goofy Simpson inverted jack leads used on the later models. I think some Triplett meters also used that but its very much not the industry standard which makes the test leads cost a lot more.
You can still buy a new Simpson and they are not cheap. Used ones can be had for peanuts because few people want analog meters. I own four of them and the test leads on each cost more than the meter did.
You can still buy a new Simpson and they are not cheap. Used ones can be had for peanuts because few people want analog meters. I own four of them and the test leads on each cost more than the meter did.