Search found 660 matches

by Gold
Thu Feb 25, 2021 4:16 pm
Forum: Build
Topic: Transfer Filter / Neumann HT75 Replacement
Replies: 15
Views: 24605

Re: Transfer Filter / Neumann HT75 Replacement

That's excellent Paul! The only one that was significantly different was: Pre B HPF Left: -14.00dB HPF Right: -13.04dB Yeah, I ran out of very tightly matched sets. I was selecting for absolute value as well as relative matching. That's why the gains also match from board to board. I could get a be...
by Gold
Thu Feb 25, 2021 3:32 pm
Forum: Build
Topic: Transfer Filter / Neumann HT75 Replacement
Replies: 15
Views: 24605

Re: Transfer Filter / Neumann HT75 Replacement

I have all four boards working and tested. Hopefully I can finish up the unit on Saturday. Since it's going in the case with the EE's the wiring shouldn't be too bad. I can recycle some of the wiring already in place. http://www.saltmastering.com/Console/Filter-3.JPG http://www.saltmastering.com/Con...
by Gold
Wed Feb 17, 2021 3:59 pm
Forum: Build
Topic: Transfer Filter / Neumann HT75 Replacement
Replies: 15
Views: 24605

Re: Transfer Filter / Neumann HT75 Replacement

Because of the weather my Mouser shipment was delayed. I've done a bunch of work on the boards so it hopefully won't be too much work to get them installed . I've stuffed and soldered one board to make sure it works. I've stuffed and soldered most of the other boards except for the tuning capacitors...
by Gold
Tue Feb 09, 2021 3:05 pm
Forum: Build
Topic: Transfer Filter / Neumann HT75 Replacement
Replies: 15
Views: 24605

Re: Transfer Filter / Neumann HT75 Replacement

Thanks Wayne! I am the one with the limping HT75's. Hopefully I'll be able to get them built and installed in the next week or so. I can't wait decommission the HT75's for a few reasons. I will be able to locate the PCB's in the same chassis as the EE. This will free up 2RU for future expansion.
by Gold
Thu Jan 21, 2021 1:59 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 151
Views: 179751

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

terkio wrote:
Wed Jan 20, 2021 5:47 pm
So, I think you do not need accurate costly capacitors, trimming will fix this like wonder. Very good TempCo seems more important than accuracy.
What about a C0G ceramic? They have very stable TempCo and are very linear.
by Gold
Sat Jan 16, 2021 7:28 pm
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 350332

Re: Mid Side M-S Matrix Construction Information

What is the wrench in the top right-hand corner of the first frame? I have one of those in the garage that was my Dad's. I have a letter and number punch set similar to yours that I inherited from either my Dad or brother. The wrench in the drawer is for a Foredom rotary tool. I think that particul...
by Gold
Sat Jan 16, 2021 6:22 pm
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 350332

Re: Mid Side M-S Matrix Construction Information

Nice! Did you CNC those dimples with one of your tools or did you have someone else do it? Do you mean the marks? That is all hand done. I had templates made for the dots and used hand stamps for the text. http://www.saltmastering.com/Console/FaceplateFab_Stamp-8.JPG http://www.saltmastering.com/Co...
by Gold
Sat Jan 16, 2021 2:59 pm
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 350332

Re: Mid Side M-S Matrix Construction Information

Here is one of the two units four channel Barry Porter EQ builds. It is M/S only using the first generation M/S boards. It's not totally the fine build but I have it installed in the console now. I had a chemical mishap with some aluminum brightener that damaged four of the eight boards. This unit u...
by Gold
Tue Jan 05, 2021 2:46 pm
Forum: Test, Measurement and Repair
Topic: Which Audio Analyser?
Replies: 22
Views: 57297

Re: Which Audio Analyser?

Since there was talk of analyzers in the Cohen/Transamp thread I thought I'd update this thread. I've given up on using the iPad/iOS. There just isn't much available. I got a Microsoft Surface Pro3 used and I'm liking Windows 10 with touchscreen. Most of the analyzer software I've tried has dropdown...
by Gold
Tue Jan 05, 2021 12:04 pm
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

Since I’ve never done FFT and swept sine testing I don’t trust a cobbled together system. My interface has ASIO drivers. The reason I picked the interface I got is that it’s flat to 60K at 192fs. It was a cheapie too. I do t think that’s the problem. A friend says he uses blue Tac on his interface k...