Pre amp isn't working - but has good voltages

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Pre amp isn't working - but has good voltages

Postby alextyler888 » Sat Jun 11, 2016 12:16 pm

I just finished building my N72 and checked all of the voltages.

From pin 1 to pin 2 had infinite resistance and from pin 2 to pin 3 I have just under 1k ohm.

I easily set the voltage from pin 2 to Q6 to 22.2

I then powered up the N72 and had no apparent problems but had no signal output.

I went ahead and checked all the readings following the instructions and got these values:

Collector Base Emitter
Q1 4.04 2.54 1.96
Q2 13.1 4.04 3.41
Q3 21.9 13.10 12.47
Q4 6.46 .87 .30
Q5 22.2 6.46 5.89
Q6 22.2 5.96 5.35

I noticed some of my levels were off. I'm currently double checking all of my resistors to the schematic. I'm puzzled why I would be so close but still have no signal.

If you guys have any suggestions I would greatly appreciate it.

Thanks
alextyler888
 
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Joined: Sat Jun 11, 2016 11:02 am

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