DCP going south??
- Thread starter roccus
- Start date
http://www.infinity-classics.de/technik/manuals/RS_IIIA_technical_sheet.pdf
Two clarifications are necessary :
- It's not Watkins crossover but Watkins Woofer ( TM ) .Sorry !
- In PL 400 manual you'll find 150 Ohm 10W and in PL 700B manual you'll find 500 Ohm W
For me it means that this value is not so critic , but I have preferred to use the higher values .
Anyways in the infinity Manual woofers ad mid has big caps in series .
Ciao
Marco
Two clarifications are necessary :
- It's not Watkins crossover but Watkins Woofer ( TM ) .Sorry !
- In PL 400 manual you'll find 150 Ohm 10W and in PL 700B manual you'll find 500 Ohm W
For me it means that this value is not so critic , but I have preferred to use the higher values .
Anyways in the infinity Manual woofers ad mid has big caps in series .
Ciao
Marco
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You got that right. I had a pair of Quantum 5's with the 12" Watkins woofs and they ate a pretty powerful Pioneer amp and then munched on a Yamaha amp. When I used the PL400 on them, it was just popping line fuses any time I tried to gas it and the amp would get pretty warm. I ended up parting them out, still have the grills and badges somewhere. Had I known about this mod I would probably still have them
Guys ,
I don't know anything about this kind of woofers .
I have only fix the problem at power up , using the official modification by Phase Linear .
The system works perfectly and there no problems to drive RSiii with PL 400 .
This system has approx 30 years and I have introduced the resistors four or five years ago .
The sound is good for my father , but to be honest,I prefer Allison One and my AR 9 .
But this is another story .
Ciao
Marco
I don't know anything about this kind of woofers .
I have only fix the problem at power up , using the official modification by Phase Linear .
The system works perfectly and there no problems to drive RSiii with PL 400 .
This system has approx 30 years and I have introduced the resistors four or five years ago .
The sound is good for my father , but to be honest,I prefer Allison One and my AR 9 .
But this is another story .
Ciao
Marco
Want to record my readings here before I disconnect DCP next I will take the DCP out of the loop and and see what offset is
Offset
Right .125 mv dc
Left .065 mv dc
Bias
Right .3447 mv dc
Left . 3486 mv dc (the bias seems to have dropped just a tad since break in)
Rail volts
84.02 vdc
DCP pins
J1-1 .082 mv dc
J1-2 not used
J1-3 .001 mv dc, 0.27 ohms
J2-1 .296 mv dc
J2-2 not used
J3-3 .006 mv dc, .31 ohms
J3-1 83.46 v dv
J3-2 .0002 v dc, .51 ohms
J3-3 61.50 v ac
Offset
Right .125 mv dc
Left .065 mv dc
Bias
Right .3447 mv dc
Left . 3486 mv dc (the bias seems to have dropped just a tad since break in)
Rail volts
84.02 vdc
DCP pins
J1-1 .082 mv dc
J1-2 not used
J1-3 .001 mv dc, 0.27 ohms
J2-1 .296 mv dc
J2-2 not used
J3-3 .006 mv dc, .31 ohms
J3-1 83.46 v dv
J3-2 .0002 v dc, .51 ohms
J3-3 61.50 v ac
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I totally believe you Marco, your word is good with me. I just know how to turn the throttle knob to the right
I just cranked the shit out of Gordon Lightfoot's Wreck of the Edmund Fitzgerald two versions on records and that song just totally roars like a mofo. If you listen to the words, you can almost see the plight of the lost mariners. The original is so haunting for lack of a better word
My buddy who founded Jag Panzer did the other version which is done up as a metal epic. The lead guitarist is Chris Broderick who a year or so later went on to Megadeth, dig it
<iframe width="560" height="315" src="https://www.youtube.com/embed/rAra9YYFpis" frameborder="0" allowfullscreen></iframe>
I just cranked the shit out of Gordon Lightfoot's Wreck of the Edmund Fitzgerald two versions on records and that song just totally roars like a mofo. If you listen to the words, you can almost see the plight of the lost mariners. The original is so haunting for lack of a better word
My buddy who founded Jag Panzer did the other version which is done up as a metal epic. The lead guitarist is Chris Broderick who a year or so later went on to Megadeth, dig it
<iframe width="560" height="315" src="https://www.youtube.com/embed/rAra9YYFpis" frameborder="0" allowfullscreen></iframe>
- Joined
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- Location
- Coventry, CT
- Tagline
- Fondler errrr... fan of all Nav's avatars
- Joined
- Jan 14, 2011
- Messages
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- Location
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- Tagline
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Ron ,
now I have a doubt :
the PL modication is related to Watkins woofers ,
but at this point I'm not sure that RSiii have this kind of woofers .
I have simply looked at the crossover diagram and I have seen
the big caps in series . These speakers were produced in the 80s' and not
in the 70s' .
Anyway the volume position is 12 / 1 o'clock .
Not only I have added two 12Kohm in series at the output of Pl 4000 ,
due to the high gain of preamp.
The levels of all sources are adjusted at 0dB Vu
The cart is Grado Z1+ ( now probably renamed as Gold 1 )
The size of the living room is 13'x13' with wooden floor and carpet .
Ciao
Marco
Carver tech found what trashed my C-1 and damaged my wopl amp I got the opamps new from the same people who make the browndog adaters...
I am done with your C-1. All is good now. I know what caused this big failure. Two of the new OpAmps on the Browndog's are bad. One of them has enormous gain. Both of them oscillate. This would explain what hosed your amp as well as the muting JFET's in the C-1.
I am done with your C-1. All is good now. I know what caused this big failure. Two of the new OpAmps on the Browndog's are bad. One of them has enormous gain. Both of them oscillate. This would explain what hosed your amp as well as the muting JFET's in the C-1.
