Where to start?

Indubidibly. It's a little known fact that some Godspeed You Black Emperor, a little soldering, a fresh pcb, and few fingers crossed can lead one straight into the dharma. No added meditation needed. Enlightenment here we come! Take that Dogen!

Yes I'm using the CAPI (Silent Arts in the EU) racks/Floor box PSUs. Worth to note is that the real savings per slot kicks in when you go for two 11 slot racks powered by one PSU. Though not dead the 51X standard doesn't seem to fly like many hoped. I only got it for my NV73s. Note that Jeff has a dual VPR PSU:
capi-gear.com/catalog/product_info.php?cPath=176_178&products_id=358

I don't know about DIY 32c eq. Only seen the non 500 format 32c thread at GDIY

Dan derlou at collective cases sells the harrison hp and lp filters which are cool. Forth monkey has a harrison eq project as well.
Imo Bluzzi's, Jeff's, The Don Classics, and Ruff Record's eq's knock it out of the ballpark and you can not go wrong. All of the aforementioned come in a variety of formats and stages. From full blown kits to a pcb and a thread supporting it.

And indeed it is. Yes you can get Jeff's rack plus power supply and build an 11 space rack. If you think your gonna fill it with Neve 24v projects get the 51x version otherwise just get the standard 500 vpr compliant (which is what i would do if i were you).
As an example of what can be implemented in 500; these are the Harrison filters i am protyping for 500 series that i was talking about. I got the filter pcbs from Dan and the 500 series connector at CAPI.




You can also get a dingo kit at JLM Audio which is a 500 series in out module balancer with accommodations for transformers and DOA's.

Hey dudes, rocinante unit7 ericn

I finished the Hairball FET500 Rev A and have run into a couple anomalies calibrating it. I'm wondering about my DMM. It's a Fluke 12B. I looked up the specs and couldn't find anything about accuracy with 1k (MIke from Hairball talks about needing to make sure your DMM has a certain amount of accuracy at 1k).

Here's the specs I could find. Do you guys see anything about 1k accuracy or anything?

assets.fluke.com/manuals/12b187xxsmeng0000.pdf


Also, feel free to disregard as it's not any of your responsibility to sort out my metering. Thanks for all the help and insight you've already given.

Calibration is a bitch on the 1176 but necessary. More importantly the order of which you do things comes into play. First is the q-bias which needs to be in the ballpark for the meters to work which makes the q bias work. Take your time. Watch the youtube videos on it and imitate him. There's a couple of calibration videos pick one and just do it slowly, hitting pause and scroll backwards. Repeat. The first time took me on and off a few days. I wish someone had grabbed me and told me too relax. Its probably not your meter but if you feel its possible buy an $8 dmm off ebay.

On holiday, so can't help much. But you contacted Mike, right? Does the calibr guide say anything about the need of a meter w 'true RMS'? Does your Fluke have that?

I should say though, it sure sounds creamy and great on vox. Excited about that.

So I did it just like Mike from his calibration video. I'm using the signal generator in PT with the FET 500 as a hardware insert. I put the meter on pins 2 and 3 of the input and adjust PT's 1k sine wave until I've got .775vac at the FET 500 input. Then I put the meter on the output and do the calibration steps from there, just like the video.

Shouldn't that work?

I do the Q bias adjustment first, then move to the gain trim. But I can't get the peak light to go off even if I turn the gain trim all the way clockwise. BUT if I lower the input nob (it's supposed to be at noon, as per the video) a ways, I can then control the peak LED with the gain trim.

It sounds great, it just hurts my brain that it won't calibrate like it should!

I have the input and output nobs at noon, like Mike says in the video. Attack and release fastest, 20:1 ratio.

I know if I mess with the input nob (lowering it) I can get the gain trim to effect the peak LED, but doesn't that mean somethings weird? If I set input/output like the video, that's when gain trim doesn't effect the peak LED.

I haven't tried messing with the output nob, but if there's no issue, shouldn't I be able to replicate what the video shows re: the gain trim and the LEDs?

Ragan buddy what's the news? Any progress?

There are a pair of LM3916 on the meter board so I'm assuming that's what you're talking about? 

I emailed Mike from Hairball today and told him I'd like them to take a look at it, even for a charge.  I just need the peace of mind.  This was my first build and I've checked and rechecked and checked again all the components.  I reflowed the whole meter board.  

It works like it's supposed to in the calibration video, just not at the input level it's supposed to work at.  I still wonder if my meter isn't accurate at 1k or something?  I couldn't find the spec on that that he mentions being important.  

They're behind right now and taking some vacation time too so he told me to contact him on the 1st.  They're in my neighborhood so it'll be easy to swing it by.  He said if there's not an actual issue with it, they won't charge me.  

I just have to know what's up, for my brain.