Forum: Troubleshooting Audio Equipment
11-05-2017, 06:26 AM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
Not sure how the stereo/mono/side switching is done (transistors, CMOS?)... it can be controlled by the software and the button on the front. However, if you route the audio output directly to 1/2...
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Forum: Troubleshooting Audio Equipment
11-04-2017, 09:31 PM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
FWIW, I've done quite a bit of capacitor comparison testing and can definitely say that there are significant differences in how they sound. One particularly interesting example was in a modified...
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Forum: Troubleshooting Audio Equipment
11-04-2017, 09:18 PM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
iXBT.com reviewed (https://translate.google.ca/translate?hl=en&ie=UTF8&prev=_t&sl=ru&tl=en&u=http://www.ixbt.com/proaudio/tc-impact-twin.shtml) the Impact Twin and some similar high frequency noise...
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Forum: Troubleshooting Audio Equipment
11-04-2017, 09:57 AM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
Actually, it is the electrolytic capacitor on the preamp gain potentiometer that I changed. Sorry, should have been more clear earlier. The datasheet recommends 6,800µF for THAT 1512, but IIRC TC...
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Forum: Troubleshooting Audio Equipment
11-04-2017, 07:45 AM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
Thanks!
Actually, the noise is present in both channels, but stronger in the right channel. The second peak appears to be a multiple of 2 times the first. Given that they are -120dB, perhaps it...
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Forum: Troubleshooting Audio Equipment
11-04-2017, 05:04 AM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
Hey Khron,
I'm hoping you might have an idea what might be causing this noise in my Impact Twin. I suspect that these two peaks (9350Hz & 18,700Hz) may be due to the unit's internal switching...
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Forum: Troubleshooting Audio Equipment
11-01-2017, 04:18 PM
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Replies: 15
Views: 594
Re: TC Impact Twin mods
Correct, the DIP adapters have another ADA4627-1 on the bottom.
The ADA4627-1 is the best sounding op amp I've found thus far. Oh, those LM4562s are on the 3/4 outputs which are not likely to...
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Forum: Troubleshooting Audio Equipment
11-01-2017, 06:54 AM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
Here's the link showing the non-linearities of various dielectrics: https://web.archive.org/web/20120110144304/http://greygum.net/sbench/sbench102/caps.html
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Forum: Troubleshooting Audio Equipment
11-01-2017, 06:44 AM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
Some capacitor info here: http://www.reliablecapacitors.com/pickcap.htm
I had a link showing oscilloscope traces for various dielectric types but cannot find it at the moment. Will post it later...
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Forum: Troubleshooting Audio Equipment
10-31-2017, 08:24 PM
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Replies: 15
Views: 594
TC Impact Twin mods
Hey Everyone,
Recently I modified my TC Impact Twin FireWire audio interface.
These units are known to have problems with failing electrolytic capacitors in the power supply section of the...
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Forum: Troubleshooting Audio Equipment
10-31-2017, 08:13 PM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
I've read about the characteristics of various types of capacitors and have seen test results. Electrolytics are among the worst for the signal path. Transparency could probably be quantified and...
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Forum: Troubleshooting Audio Equipment
10-31-2017, 07:25 PM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
Anyone care to provide a stock Impact Twin? ;)
I'd guess that there would be a significant differences in sound between a stock Saffire Pro and Impact Twin due to basic design differences. I did...
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Forum: Troubleshooting Audio Equipment
10-31-2017, 06:01 PM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
A bit tangential, perhaps.... I still haven't modified my Saffire Pro 40. Am still considering replacing some of the electrolytic capacitors and possibly some of the op amps.
However, I did...
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Forum: Troubleshooting TVs and Video Sources
03-01-2017, 05:44 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting TVs and Video Sources
03-01-2017, 05:43 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting TVs and Video Sources
02-24-2017, 04:14 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting TVs and Video Sources
02-23-2017, 04:13 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting Audio Equipment
07-01-2016, 09:30 AM
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Replies: 45
Views: 4,923
Re: Focusrite 6i6 - upgrade/mod
Better op amps can reduce distortion and improve clarity. I've replaced op amps in my Echo Gina 24 and TC Impact Twin with measurable improvements in RMAA. Also, replacing and/or bypassing...
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Forum: Troubleshooting Audio Equipment
12-14-2015, 01:15 AM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
Hey Khron,
Here's another source on op amp performance which might be of interest: http://www.sg-acoustics.ch/analogue_audio/ic_opamps/
I find myself a generally skeptical and...
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Forum: Troubleshooting Audio Equipment
12-13-2015, 01:52 AM
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Replies: 113
Views: 23,812
Re: Focusrite Saffire Pro 40 re-cap
Hey Khron,
Thanks for creating this thread. Did you ever get around to replacing the op amps on your Pro 40?
I have a used Pro 40 that I would like to modify by replacing/upgrading bypass...
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Forum: Troubleshooting TVs and Video Sources
12-04-2015, 03:02 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting TVs and Video Sources
12-03-2015, 07:17 AM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting TVs and Video Sources
11-30-2015, 03:02 PM
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Replies: 15
Views: 2,222
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Forum: Troubleshooting Laptops, Portable, and Mobile Devices
11-14-2015, 07:16 AM
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Replies: 20
Views: 2,916
Re: Oled tv bad image burn & retention 😒
LEDs slowly lose light output as they age. As long as viewing content is varied, the effect of aging is roughly equal for all LEDs, and the screen remains uniform. However, if a single image is...
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Forum: Troubleshooting TVs and Video Sources
11-05-2015, 03:37 AM
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Replies: 15
Views: 2,222
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