If the integrated amp has L-R amp-in jacks to accommodate a preamp, then yes.
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The Integrated that I already own does not have amp-in jacks nor the sort of u-shaped connector you describe.
However, generally I will just pretend that one of the 'in' jacks (such as tape or CD or tuner) is from a pre-amp. Voila, I have my pre-amp in. One could do this with virtually any integrated, so the question arises... will this hurt anything (except the sound quality)?
Now, on other amps I am considering, they may have these amp-in jacks, so they may be more accomodating to this sort of abuse.
Which Arcam Integrated do you own? Many of the Arcams have an HT bypass/processor loop, which when engaged passes the signal through without being affected by the pre-amp circuit at all.
Also, some integrated amps have passive pre-amps and you could simply use one of the regular inputs and turn the volume all the way up. This would "practically" be a power amp as the passive pre-amp is simply the volume control potentiometer. BTW, if you are considering the Jolidas, look at the Cayin TA-30 (it is "killer" in its price range). I'm currently using one as a power-amp (I have the volume turned all the way up) as my CD player has analog domain volume control and it it controlled by the remote. This setup allows me remote volume control in a system that has an amp that doesn't have remote.
Thanks for the interesting answers. I have a Delta 90.2 Arcam 2-Channel Integrated Amp. I can't recall if it's late 80s or early 90s. It has no remote, and is 70 wpc. Overall, I've been quite pleased with it. It has a "direct" button which I think may sort of be what you're referring to.
In the past, I've often had that button engaged in an effort to keep my sound "simple" but have really enjoyed being able to disengage it to play with the sound and L-R balance a little when I want.
If I buy another integrated, rather than a regular amp, I guess I'll keep an eye out for the passive preamp angle on things.