[Jukebox-list] AMI R145 Amp Modification
dave.halford at telent.com
dave.halford at telent.com
Thu Jun 7 07:03:30 PDT 2007
James
What about the impedence matching - feeding two sources into the next
stage? Come to that will the MP3 match which ever way you connect it?
However I would have thought that most hum will be well below 300MV and too
feint for the Amp to notice.
Dave H
"WHITE, JAMES P"
<JWHITE3 at entergy.com> To: <jukebox-list at lists.netlojix.com>
Sent by: cc:
jukebox-list-bounces at lists.n Subject: [Jukebox-list] AMI R145 Amp Modification
etlojix.com
07/06/2007 14:42
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Hi Karl,
I too wonder what kind of sound this will result in. I'm hoping for
just a good quality momo sound - with lots of volume of course!
Going from a stereo signal to a mono amp is not one of my concerns -
only because I have had some success with this. The last machine I
restored was a Seeburg 222 which had a stereo cartridge but a HFMA-2
mono amp. I wired the tone arm cable as recommended by one of our list
members and it sounded fine. I could be missing something here however.
I see the bigger challenges as:
1) Finding the right spot in the amp to inject the 300 mV signal. (I
need to jump past the first couple stages of amplification and try to
avoid the RIAA(?) equalization circuit)
2) Inducing Hum with all this extra input cable.
3) What happens in the amp when the signal path is switched to the new
line level signal? Will the voltages go wild?
I have the cap kit and hope to start rebuilding the amp tonight. I'm
slow so this will take a while.
JP
_____________________________________________________________________
JP,
Wow......MP3's through a mono G amp? I'm not the resident expert here by
a
long shot but I can't imagine that sounding anywhere near what I'm
guessing
your intentions are ( lots of cool music coming out of an old restored
jukebox despite the small selection of records in it).
Karl
Columbus Coin-Op Shop
2061 S. Lumpkin Rd.
Columbus, GA 31903
(706)507-2963
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