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Search: Posts Made By: 12Bass
Forum: Troubleshooting Audio Equipment 11-05-2017, 06:26 AM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-04-2017, 09:31 PM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-04-2017, 09:18 PM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-04-2017, 09:57 AM
Replies: 15
Views: 594
Posted By 12Bass
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 6,800F for THAT 1512, but IIRC TC...
Forum: Troubleshooting Audio Equipment 11-04-2017, 07:45 AM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-04-2017, 05:04 AM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-01-2017, 04:18 PM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 11-01-2017, 06:54 AM
Replies: 113
Views: 23,812
Posted By 12Bass
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
Forum: Troubleshooting Audio Equipment 11-01-2017, 06:44 AM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 10-31-2017, 08:24 PM
Replies: 15
Views: 594
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 10-31-2017, 08:13 PM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 10-31-2017, 07:25 PM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 10-31-2017, 06:01 PM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting TVs and Video Sources 03-01-2017, 05:44 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Thanks! Will have a look.

Am I correct that the Vad is what needs to be adjusted to lower MLL?
Forum: Troubleshooting TVs and Video Sources 03-01-2017, 05:43 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

I got the UT50's MLL measurements from several reviews of the television, not from word of mouth. Perhaps it lacks some of the refinement and processing found in the higher models, however, several...
Forum: Troubleshooting TVs and Video Sources 02-24-2017, 04:14 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Thanks!

Yup, the only pots I can find are Vsus and Vda.

As mentioned previously, I don't understand why the blacks on my set are not dark like they are supposed to be. A variety of...
Forum: Troubleshooting TVs and Video Sources 02-23-2017, 04:13 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Revisiting my old thread....

Now that the warranty has expired, I'm thinking about trying some possible modifications to reduce the black level on my TC-P42UT50, recognizing that any potential...
Forum: Troubleshooting Audio Equipment 07-01-2016, 09:30 AM
Replies: 45
Views: 4,923
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 12-14-2015, 01:15 AM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting Audio Equipment 12-13-2015, 01:52 AM
Replies: 113
Views: 23,812
Posted By 12Bass
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...
Forum: Troubleshooting TVs and Video Sources 12-04-2015, 03:02 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

FWIW, I've seen some posts reporting similar gray black issues with ST50s on www.avsforum.com. Perhaps some of the 2012 Panasonic plasma do have a black level issue which changes with time? From...
Forum: Troubleshooting TVs and Video Sources 12-03-2015, 07:17 AM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Thanks for the reply, tom66.

Yes, there is a slight scanning effect visible on a blank screen. The set has around 5000 hours on it. From what I've read, 2012/13 Panasonic plasmas have no...
Forum: Troubleshooting TVs and Video Sources 11-30-2015, 03:02 PM
Replies: 15
Views: 2,222
Posted By 12Bass
Re: TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Moved to appropriate thread.

Like many others, I purchased a Panasonic plasma for its excellent picture quality and dark blacks. Would it be possible to add a potentiometer or perhaps could the...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 11-14-2015, 07:16 AM
Replies: 20
Views: 2,916
Posted By 12Bass
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...
Forum: Troubleshooting TVs and Video Sources 11-05-2015, 03:37 AM
Replies: 15
Views: 2,222
Posted By 12Bass
TC-P42UT50: Any way to adjust black level on 2012 Panasonic plasmas?

Numerous tests show that the Panasonic UT50 series has a very low MLL in a dark room (comparable to the ST, GT, and VT series), yet my particular TC-P42UT50 cannot not get very dark at all on a black...
Showing results 1 to 25 of 27

 
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