Sweep

Hairball Fet Rack Blue Stripe
« on: March 14, 2019, 08:52:18 PM »
Hey Guys / Hairball Audio-
I built an 1176 Blue Stripe and couldn't get Calibration Step 3 to work.  I ran the calibration 6 times and it won't let me adjust to -10 on the meter.   After running the troubleshooting Guide my results are as follows:
Power: +30 VDC and -9.6VDC
1)Bias Voltage: -1.008 to -1.760
2)Amplification Stages
TP1: 57mV unbiased 57mV biased
TP15 2.384V Unbiased 2.107 biased
TP17 593.5mV unbiased 149.1mV
Output XLR: 10.76 V
3)GR Control Amp Input
20:1 ---388mV
12:1---- 1.89.5mV
8:1 ---126.5mV
4:1 ---- 64.1mV
4)Gain Control Amp Output
20:1 ---3.476 V
12:1---- 1.702 V
8:1 ---1.137 V
4:1 ---- .578 V
5) Gain Control Amp Threshold Voltages
20:1 ---   - 5.854 V
12:1----    -3.296  V
8:1 ---        -2.493 V
4:1 ----       -1.69 V

Any help on how to get step three to work would be great
Thanks,
Sweep


scott2000

Re: Hairball Fet Rack Blue Stripe
« Reply #1 on: March 14, 2019, 09:54:10 PM »
Usually you can find some help in the relevant build threads....

I think Mike is more active in those...

This might be a thread you could post in if it doesn't have what you may be looking for already.....??

https://groupdiy.com/index.php?topic=63600.0

Good luck!

Hairball Audio

Re: Hairball Fet Rack Blue Stripe
« Reply #2 on: March 15, 2019, 12:27:19 PM »
Moving question to appropriate thread.

https://groupdiy.com/index.php?topic=63600.msg912474#new
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