Search found 3705 matches

by JR.
Wed Mar 27, 2024 11:11 am
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 251
Views: 6534151

Re: Phono Transfer System Construction Information

These are working into a 14K3Ω load. Wima now have some nice 5 mm lead spaced films in the MKS2 series that go up to 6.8µF so keeping them film is do-able. Cool... I was measuring phase shift at 20kHz from a 22uF caps ESL working into a 360 ohm R. 14K should not cause an issue even with modern elec...
by JR.
Tue Mar 26, 2024 4:09 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 251
Views: 6534151

Re: Phono Transfer System Construction Information

Note: back when I spent too much time on my bench messing with phono preamps (1970s) I discovered a phase shift issue caused by a 22uF aluminum electrolytic capacitor's internal inductance (in a gain leg in series with 360 ohms). I expect modern electrolytic capacitors are much better but maybe keep...
by JR.
Tue Mar 12, 2024 2:16 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 251
Views: 6534151

Re: Phono Transfer System Construction Information

IIRC the IEC proposed a real pole at 20Hz (7950 uSec) back in the 80s (?). The RIAA dismissed that suggestion and left the sub 20Hz response pretty much undefined beyond the three standard RIAA time constants (75uSev, 318uSec, 3180uSec). Back in the 80s when I was trying to escape from the audiophil...
by JR.
Mon Feb 19, 2024 11:47 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17120

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

One thing I'm going to change is the gain control of the capacitance multiplier. The pot is too cramped at slow rate settings and most people would want stepped controls anyway. Switching input resistors on the inverting stage to use a 6 position rotary switch with 600, 480, 360, 240, 120 and 60 dB...
by JR.
Sat Feb 17, 2024 8:47 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17120

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Over the years, often working with inferior gain elements, at least part of the effort was to mitigate sudden gain change artifacts. The pan between dry and full gating helped coax out subtle flaws. The problem was flaws heard with complex (music) waveforms that weren't heard with standard test sign...
by JR.
Fri Feb 16, 2024 10:08 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17120

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Back when I was seriously designing dynamics processing circuits a homemade tool that I found useful was a variable tone burst circuit. Sorry if I've shared this before, the drawing was done in 2007 and I designed this back in the 70s/80s. The bottom section generates adjustable on time and off time...
by JR.
Tue Feb 13, 2024 1:19 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17120

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Getting a little esoteric is there any risk of making compression too clean (i.e. having no sound signature)? Back in the 80s when I was tweaking companding NR my goal was to be as transparent as possible. Modern compression customers may have preconceived notions about what compression "should...
by JR.
Tue Feb 13, 2024 10:18 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17120

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Lower distortion should always be good.

Does it impact the waveform distortion caused by fast release on pure low frequency tones?

While it is unclear that this mechanism is an audible problem with real world complex waveforms.

JR
by JR.
Thu Feb 08, 2024 2:08 pm
Forum: Pro Audio Design
Topic: Spring Reverb Preemphasis
Replies: 5
Views: 1355

Re: Spring Reverb Preemphasis

yup... the "boing" is the odd overload artifact I was referring to.

JR