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Old 11th November 2012, 02:34 PM   #7661
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Finally had time to start to assemble my Paradise preamp boards. Both shunt supplies section are working fine. I tested them using a simulated preamp load, and was able to check my pre-reg and rc-filer small pcb as a complete circuit. That confirmed that the pre-reg pcb is ok, and with the specified parts, the RC filter drop resistor gives me 26.5V at the input of the preamp insuring that the shunt heatsink is not too hot. I'll continue the assembly of the preamp.
Attached Images
File Type: jpg Pre-Reg & RC_Filter_on Test.jpg (139.5 KB, 219 views)
File Type: jpg RC_Filter_SB.jpg (100.9 KB, 218 views)
File Type: jpg RC-Filter.jpg (124.1 KB, 191 views)
Attached Files
File Type: zip Paradise_Parts_List_small.zip (14.4 KB, 25 views)
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Old 11th November 2012, 02:37 PM   #7662
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That looks great !
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Old 11th November 2012, 03:57 PM   #7663
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And would even look better in the Builder Thread ?!
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Old 11th November 2012, 05:21 PM   #7664
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What is the recommended IDSS value for the 2SK170 used in the circuit?
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Old 11th November 2012, 05:24 PM   #7665
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Around 8mA. It can be higher. That value gives the range where the JFet works in class A
( aprox. ), so 8mA give you 80V dynamic range into 10kOhm, that is ample.
Into 1kOhm that transfers into 8V, still enough.
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Old 11th November 2012, 09:02 PM   #7666
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Algar_emi View Post
Finally had time to start to assemble my Paradise preamp boards. Both shunt supplies section are working fine. I tested them using a simulated preamp load, and was able to check my pre-reg and rc-filer small pcb as a complete circuit. That confirmed that the pre-reg pcb is ok, and with the specified parts, the RC filter drop resistor gives me 26.5V at the input of the preamp insuring that the shunt heatsink is not too hot. I'll continue the assembly of the preamp.
Very nice very nice, high five - YouTube
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Old 11th November 2012, 09:40 PM   #7667
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Installed all the preamp parts, all matched per sections. Here my readings, I'll check the RIAA curve accuracy this evening. Since everything is well balanced, I guest it is working fine.

Supplies +/-18V, 150ma ea

TP3= +14.5V TP5, 6= +16.36V
TP4= -14.5V TP9,10= -16.36V

Each Gain Cell transistor, each emitter resistor V=115mv (3.5ma each)

Vin = 0mv (adjusted with R1)

Vout: DC offset keeps changing around +/-25mv

Gain: 61.4dB at 1Khz
Vout max: 30Vpk-pk
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Old 11th November 2012, 10:31 PM   #7668
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That looks good. DC offset will go down after a while i think.
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Old 11th November 2012, 11:28 PM   #7669
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I added a line input to my smallest preamp called " Das unbeschriebene Blatt" ( The Blank Page ). It has DIN A4 proportions. The cables go in from the top.
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Old 11th November 2012, 11:30 PM   #7670
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In the backround you see a phono stage
called " Stille " ( Silence ) i prepare for the Vienna Klangbilder show.
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