Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #160 on: May 29, 2020, 05:22:26 PM »
Got a funny feeling my HF noise problems are my hackintosh audio problems!
Im going to bypass the onboard audio kexts and hopefully the cpu noises etc will go away!!
I've got a weird MB where the audio side isn't exactly easy to sort and I think I need to get it properly sorted!!
I seem to remember it didn't make these noises before I tried  to install the audio kext.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #161 on: May 30, 2020, 09:58:48 AM »
Have taken out the offending hackintosh kext and using loopback for my system audio, seems to have greatly improved the noise floor.
My squire bass I have taken out all the non screened cable and replaced with screened cable and is much better now.
2254 does still seem a little hissy but it's so much better.
Replacing all necessary caps for polystyrene caps once they are delivered.
And going to finish the mumetal cases for the input txf.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #162 on: June 03, 2020, 09:55:58 AM »
I've changed all caps that should be polystyrene apart from the 4700pf which isn't hear yet and no real difference in noise floor?
What noise floor should I be see anyone?

Is there any known improvements to the noise floor?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Rob Flinn

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #163 on: June 03, 2020, 12:07:55 PM »
I've changed all caps that should be polystyrene apart from the 4700pf which isn't hear yet and no real difference in noise floor?
What noise floor should I be see anyone?

Is there any known improvements to the noise floor?

What noise floor are you getting ?
regards Rob

Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #164 on: June 04, 2020, 02:05:13 AM »
Neve quotes-73dBm (20Hz – 20kHz), without any gain reduction as noise floor.

I'll figure out REW and see where I'm at compared to the -73dbm
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #165 on: June 05, 2020, 01:18:33 AM »
Little update, I've changed the input 1k post for stepped lorlin and changed the other 4700pf.
Have had a listen and compared channels, ch1 has all the caps changed and the lorlin and is now audibly quieter than ch2.
I'm going to try and setup RWAA software on another laptop with windows 10 on it and do some noise floor measurements.
My gnd scheme is slightly different on each channel so will also test if one is better than the other
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

opacheco

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #166 on: June 05, 2020, 08:14:05 PM »
I have wound all new transformers as most of the problems i was having, was due to miss match of transformers.
now getting good signal through both channels but I have had to take out of case again and layout on bench.
One channel is not compressing at all, and the other is but the threshold control has problems and its a bit hit and miss?
will look at signal going into BA191 and see if i can trace the signal which leaves the SC back into the Limit SC.
I think the signals output form the limit SC is (A) and goes back into the control Amp on BA185 by (M)?

is this where the compressed signal comes back in?

If anyone could explain the signal flow of the compressed signal please?

Spencerleehorton, this is an incredible project!!, fantastic at all and a complete learning process undoubtedly!. I am thinking o do the transformers by myself too and I would like to know if Could you let me to know the winding information that you used for winding the transformers please ??

Thanks anticipated
opacheco.
I love the Vaccum Tubes Sound!!!

Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #167 on: June 05, 2020, 11:39:06 PM »
I've upload the winding sheets in the technical documents section under neve.
It will depend on what core and size you are using so you will have to change if not using exactly the same as the sheet.
I'm not going to say how I did mine as mine are completely different but just the same specs.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

opacheco

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #168 on: June 06, 2020, 02:02:18 AM »
I've upload the winding sheets in the technical documents section under neve.
It will depend on what core and size you are using so you will have to change if not using exactly the same as the sheet.
I'm not going to say how I did mine as mine are completely different but just the same specs.

Spencerleehorton, let me to check them there!

Thanks
opacheco
I love the Vaccum Tubes Sound!!!

Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283
« Reply #169 on: June 17, 2020, 10:48:12 AM »
Finally seem to have this thing working right, the noise I was getting I think! Was a faulty api preamp that I was using as when I di bass through a 1290 neve preamp there is no hiss and the sound is amazing!!!
More testing needed but I feel I'm actually getting somewhere now.
Next test is to put some drums, guitar and vocals through, then a full mix.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


Spencerleehorton

Re: Neve 2254 build with ba185, ba191, ba192, ba283 New
« Reply #170 on: June 22, 2020, 07:51:31 AM »
just changed and checked the recover lorins for 8 stages and everything works so much better now!!
Have done a little video on youtube.

https://youtu.be/dJ6KCBNpsD4
« Last Edit: June 22, 2020, 11:36:18 AM by Spencerleehorton »
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


 

Related Topics

  Subject / Started by Replies Last post
12 Replies
6667 Views
Last post September 19, 2004, 03:13:37 AM
by tardishead
37 Replies
12221 Views
Last post November 27, 2018, 06:01:09 AM
by Martin Griffith
73 Replies
35765 Views
Last post September 26, 2010, 01:51:30 PM
by SIXTYNINER
4 Replies
499 Views
Last post October 07, 2019, 05:33:51 PM
by Michael Tibes