sci.electronics.repair@googlegroups.com

Google Groups

thekmanrocks@gmail.com: Oct 26 12:04PM -0700 Cyndrome Leader wrote: "yes, and there are different types of phosphor. Some look better than others where color temp matters. "   And there are adjustments available on most panels to being all of those into grayscale spec.

Cydrome Leader <presence@MUNGEpanix.com>: Oct 26 10:05PM > And there are adjustments available > on most panels to being all of those > into grayscale spec.   Adjustable backlight color temp on cheapo televisions?   I've seen color corrected LED backlights on high end computer displays. I use a 4k Eizo that has this feature, it's not tunable but the color temp has a few settings and only the highest one is harsh blue, as it should be (and also not used as it looks bad, like televisions at the store).

thekmanrocks@gmail.com: Oct 26 04:14PM -0700 On Monday, October 26, 2015 at 6:05:40 PM UTC-4, Cydrome Leader wrote: com wrote: > > on most panels to being all of those > > into grayscale spec.   > Adjustable backlight color temp on cheapo televisions?   Not the backlight - the overall picture. > use a 4k Eizo that has this feature, it's not tunable but the color temp > has a few settings and only the highest one is harsh blue, as it should > be (and also not used as it looks bad, like televisions at the store).   "harsh blue, as it should be" ???   Are you serious?

Cydrome Leader <presence@MUNGEpanix.com>: Oct 27 03:53PM >> > into grayscale spec.   >> Adjustable backlight color temp on cheapo televisions?   > Not the backlight - the overall picture.   exactly. If you try to compensate for a horrible backlight you're going to lose the full gamut the display should have been able to show.   >> be (and also not used as it looks bad, like televisions at the store).   > "harsh blue, as it should be" ???   > Are you serious?   Serious. 10k color temp looks bad on a good monitor, and that temp is even far exceeded by cheap displays.

thekmanrocks@gmail.com: Oct 27 09:43AM -0700 Cydrome Leader wrote: "thekma...@gmail.com wrote:   "exactly. If you try to compensate for a horrible backlight you're going to lose the full gamut the display should have been able to show. "   And this is where colorimeter-based calibration comes in. By adjusting the bias/gain, and the RGBs, you can compensate for any backlight flaws and maintain correct color gamut.     "Serious. 10k color temp looks bad on a good monitor, and that temp is even far exceeded by cheap displays. "   So given that, and your first quoted statement above, would you still keep the OOB settings on a consumer display, or would you at least attempt to get the basic settings closer to standardized positions?

Tim Schwartz <tim@bristolnj.com>: Oct 27 08:04AM -0400 Hello all,   I need a 1-403-290-11 detector transformer which after 35 or 40 years is no longer available from Sony. It was used in the tuner section of many models. Unfortunately, the wiring is badly corroded so the transformer is not repairable. Among them (there may well be others):   STR-6120 STR-6050 STR-6055 STR-6065 STR-7045 STR-7055 STR-7065 HP-188 HP-210   Anyone got a scrap unit that they'd be willing to pull the transformer or board from and sell me?   Thanks! Tim Schwartz Bristol Electronics tim@bristolnj.com

N_Cook <diverse@tcp.co.uk>: Oct 27 03:32PM On 27/10/2015 12:04, Tim Schwartz wrote: > Tim Schwartz > Bristol Electronics > tim@bristolnj.com   If that Tx is showing corrossion then any ceramic resonator is probably gone ohmic .

ggherold@gmail.com: Oct 26 09:55AM -0700 > Cylindrical. Axial leads.   > Ordered caps for a speaker crossover because the leads had literally been shaken out of the originals. But I had no luck finding those bulbs. I would rather not jump it out. I guess I could and just put a beefier horn in it.   How big are they? We buy little incandescent bulbs from Mouser. http://www.mouser.com/ds/2/423/T-11_2WedgeBase-T-13_4WireTerminal-552494.pdf   They might have others.. not the best search engine.   George H.

ggherold@gmail.com: Oct 26 09:58AM -0700 On Sunday, October 25, 2015 at 7:12:18 PM UTC-4, Trevor Wilson wrote:   > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus   Hi Trevor, I'm not an audio guy. But one thing about polyswitches is that they do age.. the more times they trip the lower the trip point. I don't know if that would be an issue where you use them.   George H.

Cydrome Leader <presence@MUNGEpanix.com>: Oct 26 06:27PM > of wireless - apparently it was used as a detector.   > The type I remember from the days of AC/DC TVs and radios was an iron wire > filament enclosed in a hydrogen filled envelope.   What did these tubes look like, any idea why they used iron and hydrogen?

"Ian Field" <gangprobing.alien@ntlworld.com>: Oct 26 07:23PM "Cydrome Leader" <presence@MUNGEpanix.com> wrote in message news:n0lr9m$57i$1@reader1.panix.com... >> wire >> filament enclosed in a hydrogen filled envelope.   > What did these tubes look like, any idea why they used iron and hydrogen?   They were long-ish tubes with an octal base. There was a glass stem inside with radial support spring struts and the wire zig-zagged up and down to complete a circle inside the tube.   When I got into the trade, they'd been largely superseded by rod type thermistors, there was just the odd one or two turned up in older gear - as they never gave me any problem, I never bothered researching it much.   Searching; "C1.pdf" will get you a datasheet, or search; "barretter" will get you some old radio museum pages for stuff they're used in.

Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: Oct 27 07:43AM +1100 > Hi Trevor, I'm not an audio guy. But one thing about polyswitches is that > they do age.. the more times they trip the lower the trip point. > I don't know if that would be an issue where you use them.   **Whilst I have not noticed the effect you describe, I do not suggest that you are wrong, but it would be instructive to know how many trips lead to unacceptable aging. That figure would need to be balanced against the life-span of a baretter.     -- Trevor Wilson www.rageaudio.com.au   --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

mroberds@att.net: Oct 27 12:08AM > I located and measured a long, thin filament lamp (which looks like a > baretter). Part # GE1936. Nominally, I would guess it is a 12 Volt > lamp. At 12 Volts, current consumption is 0.75 Amps.   For what it's worth, this lamp appears to be a 22 V, 1 A nominal rating.   http://www.donsbulbs.com/cgi-bin/r/b.pl/1936~general-electric.html   Standard disclaimers apply: I don't get money or other consideration from any companies mentioned.   Matt Roberds

Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: Oct 27 04:57PM +1100 > Standard disclaimers apply: I don't get money or other consideration > from any companies mentioned.   > Matt Roberds   **Nice catch. That is, indeed, the lamp. At 22 Volts, current consumption is 1.04 Amps. Near enough.   -- Trevor Wilson www.rageaudio.com.au   --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

Phil Allison <pallison49@gmail.com>: Oct 27 01:35AM -0700 > Hi Trevor, I'm not an audio guy. But one thing about polyswitches is that > they do age.. the more times they trip the lower the trip point.   ** Absolutely correct and it can be a real PITA.   Polyswitches go high resistance at about 100C and running one for long periods near the trip temp reduces the current needed to cause tripping.   For predictable long term operation, the trip current needs to be at least double the running current of the device.   FYI: Average DC or RMS AC values must be used in all tests.     ... Phil

ggherold@gmail.com: Oct 27 07:47AM -0700 On Monday, October 26, 2015 at 4:44:13 PM UTC-4, Trevor Wilson wrote: > that you are wrong, but it would be instructive to know how many trips > lead to unacceptable aging. That figure would need to be balanced > against the life-span of a baretter. I wrote an email to littlefuse a while back when I noticed this effect. I went looking (for where I might have put the data.)   OK here's a link to where I asked the question on Stack exchange. http://electronics.stackexchange.com/questions/121845/polyfuse-resettable-ptc-lifetime   Lot's of numbers there.. And I summarize the data from littlefuse.   George H.

"Bob F" <bobnospam@gmail.com>: Oct 26 11:47AM -0700 John Robertson wrote:   > You can not charge a computer (traditional laptop) using the USB port.   > Probably won't hurt the USB port, but why take a chance? If you have a > dead charger you will need to replace it I'm afraid...   To put it another way - There is no way power introduced by a USB port would charge a computer battery.

jurb6006@gmail.com: Oct 26 12:01PM -0700 Well well well, they did not misname them, the raster lines are vertical. So I finds a cap off the flyback causing the compression.   Now the phasing is off. I looks like there is a foldover on the bottom but there isn't. Turning up the brightness to the point of seeing the whole raster it is fine.

You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.