Having just spent an afternoon & evening doing a major strip down, clean & rebuild on the system, I am puzzled at the connections to the 135's. Each 135 has a signal lead input to put in either the socket marked Left Channel or the one marked Right Channel. Then one set of loudspeaker outputs.
It's a mono amp. Why have left & right channel inputs? It's just straight through - isn't it?

It's because of the way Naim wire the cables up - which might have something to do with 250 compatibility (not sure as I've never used a 250). What I find really odd is why they need left and right connectors on the 135s AND red and green marked leads. One or the other should be entirely sufficient.

Thanks Patrick. I thought it was something obvious and I was going mad.
So they have additional sets of sockets - just so they can use a similar lead to the 250? That isn't carried through to the speaker leads though because the plugs are mirrored on a stereo amp! Mysterious.

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Having just spent an afternoon & evening doing a major strip down, clean & rebuild on the system,

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You took your amps apart???


Laurie S

No Laurie, just unplugged everything and tuned the rack, dusted and cleaned the boxes, cleaned all the contacts etc.
I find it good to re-level everything from scratch every once in a while. With 7 shelves on spikes, and the rack itself on spikes, it takes some time.

Hi Rasher

Depending how old your 135's are; the interconnects used to be wired so that either cable would work either channel.

Later; Naim channel coded them by not connecting the unused wire for that channel in the 3 pin 'Canon' plug.

It thus became a tweak on older leads to snip the unused wire for each channel in the 'Canon' plug.

I did mine at the time. As ever, consult with your dealer - the relevant information came from mine at the time.

John.

P.S. I've realised from your most recent post that you probably have 6 of the blighters in active configuration. Thus; I'm not sure if my information is still relevant?

Martin Payne can probably answer this.

Martin?

JN speaks soothly.

Naim could have moved over to a single socket once the left/right-handed cables became available, but the investment in re-tooling could not be justified.

cheers, Martin

E-mail:- MartinPayne (at) Dial.Pipex.com. Put "Naim" in the title.

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... the investment in re-tooling could not be justified.

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You've got to be joking! (Note to metalbasher: don't drill one hole: Note to wireperson: fit one socket only and link pins 1 & 3 - 're-tooling' done!)