RC1070 build?

[Joey_V]

Just wondering, does the RC1070 have a toroidial transformer? It seems pretty hefty and it feels like it might have one... Does having a toroidial transformer in the preamp = a good thing?

If it does have one, what does the transformer actually do to the initial source signal? I know it brings it up from the mW range to a few watts and then sends the analog signal to the amplifier for further amplification.... is this remotely right?

[Ossi]

This is not about only one part of a whole in a component.
The RC1070 is at his price point quite ok. However why not open the cover and compare the inside with a RC 995 or RC 1090. More parts do not mean automatically better sound, but in this case you can clearly see where the difference comes from.
If you are into a good pre from Rotel, better get a RC1090 or a used RC995.
I hope they will make a replacement for the RC1090.

[Taito]

Hi Joey,

The RC-1070 does have a toroidal transformer. This transformer is in the power supply, not the signal path. A torroidal transformer typically produces a lesser stay magnetic field than a 'conventional' transformer. This is a good thing.

Most of the inputs are line-level (CD, AUX, TAPE etc.). This means that the voltage input will have a max of about 2V RMS. This will rarely (if ever) require further amplification, but rather attenuation, so that a lower voltage signal is fed to your power amplifier. The phono input does amplify the signal and equalise it. This is because the cartridge on a record player produces a small (relative to line-level) voltage.

The power amplifier will further amplify the voltage that it receives, but the main requirement of a power amplifier is that it be able to supply the required current (dependent on and varies with voltage and speaker impedace (varies with frequency) ) to the speaker.

Hope you find this helpful,
Ben

[Joey_V]

Thanks Ben! That was helpful! :T

[abqnmusa]

I owned the RC1070 and RB-1080 powering B&W 804's. Was not happy with the sound at higher volumes. Later tested RC-1090 on same system with XLR connection between 1090 & 1080. It does the trick with clean sound at even high volumes. Yes, it costs more but has been reliable and solved my sound issues.