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Exposure VII Pre-Amp

Am I right in thinking that the circuits exposure used in these amps was very similar to the ones naim use? although not in a daughter board configuration?
Rgds
Stuart
 
Similarish, but based on a split rail power supply rather than single rail.

The same zetex transistors were used but a lower gain band variant (b's rather than c's) and the decoupling caps are bigger. The naim and expo mc phonostages are very similar in design being based on a transistor ladder, but expo used 7 transistors as opposed to naim's 5.

The expo VII is sonically in the same league as later Naim 82's and 52's and will easily see off any of the Naim shoeboxes in most applications (which certainly includes driving Naim power amps). The voicing is almost identical to Naim.

The one limitation is that it has much less drive into low impedances than Naim preamps so it won't drive headphones directly.
 
Naim preamps.

1. Buffer stage before volume knob.
2. Star earthing
3. No onboard regulation except for CD Players
 
True craftsman that chap.

But all that effort would be for nought if the supply is feeding a standard Expo VII. The onboard regulators will enjoy being fed nice superregged low noise DC, eat up 6v and spew out mere 317/337 quality +-18v to the preamp circuits.
 
You can't easily it's only supposed to take two of them and you should take one from each side.

The other two are supposedly for powering an active crossover of which very few seem to exist.

I expect you could McGuiver it to run the phono section separately from the rest of the preamp.
 
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