Rob wrote:

I'm having to cobble together an interim phono premap solution, and I'd
be grateful for some advice.

I've got a MF LPS phono amplifier rated at 100 ohms input impedence for
the MC bit, and an AT OC9 cartridge rated at 20 ohms load impedence.

Does this matter?

If so, how do I correct it?

Thanks

Rob

As a rule, provided the load impedance is higher than the source impedance
you will be OK in audio circuits. There are, however, exceptions, and
cartridges can be one of them. Note your cartridge has a rated load
impedance of 20ohms. A cartridge is a complex electro-mechanical device
and for proper operation is may need to 'see' this impedance to perform
optimally. For this reason many pre-amps have switchable input loads.

Ian

--
Ian Bell