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Old 26th November 2006, 07:14 PM   #1
Bertje is offline Bertje  Netherlands
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Join Date: Jan 2004
Location: Holland
Default Phoenix Gold TI500.4

I'm modding this nice amp for a car audio SQ competitor, he wants to run it without the filters, opamps etc. Just the poweramplifier.
Which elco's need to be removed to decouple the pre from the power amp? Schematics welcome..

I allready remove the piggyback pcb.

Thanks!
Rob.
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Old 27th November 2006, 07:24 PM   #2
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There are still op-amps on the main board that must be removed from the circuit. I have a 600.2 on my bench as I write this. You must draw out the input circuit for the main amps. PG will not share docs with you or anyone , even me and I'm fairly local to them and they know me.

Good luck on your project though, it will sound very good when your done, if you ad a bit more energy storage to the rails. I would say about 2 each 10,000 ufd should do the trick. i did this to my Ti-475 years ago. It ran cooler nad never cut off again from heat. plus the bottom end became rock solid after that. try it, it worked for me
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Old 28th November 2006, 05:57 PM   #3
Bertje is offline Bertje  Netherlands
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Join Date: Jan 2004
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Ok thanks, I was drawing the signalpaths for the opamps bassboost and gain adjust..,.a time consuming job... but OK.
The railvoltage will be stabilised with 2x 6800uF / 63V Panasonics TS-HA extra
Rob.
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Old 28th November 2006, 06:49 PM   #4
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Quote:
Originally posted by Bertje
Ok thanks, I was drawing the signalpaths for the opamps bassboost and gain adjust..,.a time consuming job... but OK.
The railvoltage will be stabilised with 2x 6800uF / 63V Panasonics TS-HA extra
Rob.
Should sound nice

On another note, you might look at Analoge Devices or Burr-Brown for some real Pro op-amps in the front end. They will work nicely, and leave all the functionality that PG intended you to have with the amp.
Just a thought, Good luck on your project
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Old 29th November 2006, 08:18 PM   #5
Bertje is offline Bertje  Netherlands
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Join Date: Jan 2004
Location: Holland
I did found the cap's, C104/204/304 ans C404 (4 channels..) on the mainboard they couple the opamps to the poweramp.
I want to remove the opamps, not exchange them with BB or AD or LT types....
The new pre-amp/ linedriver will be the Musical Fidelity tube buffer, so it will be a real hybride. All prototyping ...
Rob.
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