Ty_Bower wrote:They're easy to confuse - they all look the same. I've done a little research - here's what I've found so far:
Everything in the "GTP" family has a tuner:
GTP-350: no phono, no remote
The GTP-350 was the first Adcom
pre-tuner I ever heard. The highs are
a bit forward, but the detail is excellent.
Fine phono-stage.
http://www.adcom.com/data/manuals/gtp350manual.pdfGTP-400: phono, no remote
I owned the GTP-400 for a while. The
LED tuner-presets had a nasty habit of
staying lit, so I exchanged it. Otherwise,
the sound was indistinguishable to the
GTP-350.
http://www.adcom.com/data/manuals/gtp400manual.pdfGTP-450: remote, no phono
My sister owns this. I like the GTP-350
and GTP-400 better. You can sometimes
get the latter 2 for <$100 on e-bay. A
steal.
http://www.adcom.com/data/manuals/gtp450manual.pdfGTP-500: phono, remote
GTP-502: remote, no phono
GTP-506: remote, no phono, (multi-room unit)
Nothing in the "GFP" family has a tuner:
GFP-345: no remote, phono amp is on optional daughterboard
GFP-555: phono, no remote
Beware of the GFP-555. The first version
got one good review and people snatched
them up like baseball cards. The sound
quality coming from this pre-amp is sterile.
The GFP-555 II is another story. I currently
own this. Fine phono-stage. 2 sets of
outputs. Excellent stereo image and detail. I
think the highs are a bit subdued. Because of
this, the otherwise wonderful pre-amp is a bit
'brown-sounding'. The GTP-350 and
GTP-400 are far brighter.
http://www.adcom.com/data/manuals/gfp555IImanual.pdfGFP-565: phono, no remote
The GFP-565 was the finest pre-amp made
by Adcom. They call it the 'reference' for
good reason. 3 sets of outputs: bypass, lab,
and normal. A very clean pre-amp.
http://www.adcom.com/data/manuals/gfp565manual.pdfI rarely use the tone controls on these
Adcom preamps, but the contour (loudness)
button is very precise and helpful.
GFP-710: phono, remote
GFP-715: phono, remote
GFP-750: remote, no phono
Someone mentioned the GTP-600. It really isn't the same animal as the "classic" Adcom preamps above. It's in the "home theather" category, with a Dolby Prologic decoder built in (no DD or DTS, though). It does have a tuner and a remote, but no phono input.