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Old 26th February 2013, 10:24 AM   #1571
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Sorry!

Great Confusion!

Output Voltage is +15,57V and RIAA is 15,8V.
Servo Voltage (Pin6 OPA) is -18Volt!

Last edited by GandRalf; 26th February 2013 at 10:29 AM.
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Old 26th February 2013, 06:44 PM   #1572
hesener is offline hesener  Germany
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Quote:
Originally Posted by GandRalf View Post
Sorry!

Great Confusion!

Output Voltage is +15,57V and RIAA is 15,8V.
Servo Voltage (Pin6 OPA) is -18Volt!
hi Gandralf, something is going VERY wrong here. Looks like the servo is doing his job, though, and the problem is somewhere else. I suspect the current mirror around Q6-Q9, you may want to check if all those transistors are correct and working. The voltages on test points TP9 and TP10 should be as indicated in the assembly guide (-16.5V); if they are stuck at -18V then no current is flowing in that mirror.

Let me know if you can find the problem, alternatively send the boards to me (but within this week, please - have to travel end of next week.....)
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Old 27th February 2013, 06:50 AM   #1573
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Hi guys

And it sounds very very good!!
Thanks to all who worked on it.

Greeting Heinz
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Old 27th February 2013, 10:00 AM   #1574
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The current mirror :

TP9 -16,51V TP 10 -16,52V.

Emitter Q 24 -15,20V; Basis -14,62V

TP4 -14,51V

Changed Q7. -No difference.
Changed all Transistors in current mirror. -No difference.

Is it possible that Q99 causes such an error?
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Old 27th February 2013, 12:14 PM   #1575
RCruz is offline RCruz  Switzerland
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I had a similar experience once and found a shorted fet on the output buffer.

Please check the two top fets on the output buffer.
Attached Images
File Type: png SHORTED FET.png (87.5 KB, 301 views)
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Old 28th February 2013, 09:01 AM   #1576
hesener is offline hesener  Germany
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yes, it could be the output buffer. according to these values, the current mirror is biased correctly. Something is pulling down the voltage at the connection of the mirrors.

Is there a voltage difference between "Ext RIAA" and the output?

... oops, just saw you already posted that value - yes it looks like Q99 has a problem.....
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Old 1st March 2013, 08:04 AM   #1577
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by hesener View Post
yes, it could be the output buffer. according to these values, the current mirror is biased correctly. Something is pulling down the voltage at the connection of the mirrors.

Is there a voltage difference between "Ext RIAA" and the output?

... oops, just saw you already posted that value - yes it looks like Q99 has a problem.....
Or Q90.
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Old 1st March 2013, 08:21 AM   #1578
pdul is offline pdul  Denmark
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As mentioned earlier, i have tried my paradise, and the sound is amazing, but the gain is lower than the rest of my components ( I have to bottom my volumepot out to get a realistic listening level) So i just wonder if it is suppose to be like that, or if i maybe have made a blooper somewhere?
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Old 1st March 2013, 08:25 AM   #1579
pdul is offline pdul  Denmark
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Pu Dynavector Karat17D2 32ohms loadresistor 100ohms output 0,2mv
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Old 1st March 2013, 12:05 PM   #1580
hesener is offline hesener  Germany
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Originally Posted by pdul View Post
As mentioned earlier, i have tried my paradise, and the sound is amazing, but the gain is lower than the rest of my components ( I have to bottom my volumepot out to get a realistic listening level) So i just wonder if it is suppose to be like that, or if i maybe have made a blooper somewhere?
that is a little surprising. I found it to operate on par with other phono stages and no big difference in gain (I seem to remember 60-65dB at 1kHz). If the tonality is correct (in other words, excluding any issue with the RIAA section), the gain should be more than enough, even with the lowish output voltage of your cartridge.... strange....

do you have the means to measure the gain, e.g. with a 1V sinewave input @ 1kHz, and a 1000:1 voltage divider (10kOhm : 10 Ohm) at the input, then the output voltage should again be 1V (since 1000:1 == 60dB)?
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