GTP is tuner preamp, GFP is pure Preamplifier. If You can get GTP-502 You will be more than happy. I use GTP-502 with McIntosh MC252. I never had a better sound. Preamp is totally neutral.
I had a GTP400 and it was "muddy" sounding.No clear picture of instruments or voices.I now have a GFP710,bought here on audiogon, that sounds terrific.Not a technical answer but I hope it helps you.
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