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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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CRT question
On 26/08/2019 1:57 am, Andy Burns wrote:
Trevor Wilson wrote: Try a Rigol DS1054z. A very impressive 'scope for not too much cash And easily hackable to add extra bandwidth and features. **Yep. Buy the 50MHz model and convert it to 100MHz. Worst thing about the Rigol is the probes. Truly horrible probes. The worst I've ever used. -- Trevor Wilson www.rageaudio.com.au --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#43
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CRT question
On 25/08/19 19:05, wrote:
On Sun, 25 Aug 2019 10:37:07 -0700, Jeff Liebermann wrote: SNIP Yeah Jeff, it really is a kit. Here's the link: http://oscilloscopeclocknixiecrt.com/Kit.htm I wish I had traced out the circuit before I populated the board. But it's double sided and now really hard to see where traces go when they hide under components. Eric Rather off-topic, but in one of the pictures (uncaptioned, about 2/3 to 3/4 of the way down, where the clock is on a stepped, wooden base) the valves are nicely coloured - green on the left, purple top right, and blue bottom right. I assume these are simply non-functional valves with a coloured led hidden in the base. Those are pretty unusual colours for leds; maybe a white led with a coloured filter has been used. And are the valves non-functional? I would expect the base to get pretty hot with the filament at that end. Not a good environment for an led. -- Jeff |
#44
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CRT question
Jeff Layman wrote:
-------------------- Rather off-topic, but in one of the pictures (uncaptioned, about 2/3 to 3/4 of the way down, where the clock is on a stepped, wooden base) the valves are nicely coloured - green on the left, purple top right, and blue bottom right. I assume these are simply non-functional valves with a coloured led hidden in the base. Those are pretty unusual colours for leds; maybe a white led with a coloured filter has been used. And are the valves non-functional? I would expect the base to get pretty hot with the filament at that end. Not a good environment for an led. ** Likely the valves are not operating and the rather bright light is coming from thin ,coloured filament bulbs - as used for xmas decorations and tree lighting. The hole in the bottom of a 9 pin valve base is not very big. ..... Phil |
#45
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CRT question
On Monday, 26 August 2019 08:05:38 UTC+1, Jeff Layman wrote:
On 25/08/19 19:05, wrote: On Sun, 25 Aug 2019 10:37:07 -0700, Jeff Liebermann wrote: SNIP Yeah Jeff, it really is a kit. Here's the link: http://oscilloscopeclocknixiecrt.com/Kit.htm I wish I had traced out the circuit before I populated the board. But it's double sided and now really hard to see where traces go when they hide under components. Eric Rather off-topic, but in one of the pictures (uncaptioned, about 2/3 to 3/4 of the way down, where the clock is on a stepped, wooden base) the valves are nicely coloured - green on the left, purple top right, and blue bottom right. I assume these are simply non-functional valves with a coloured led hidden in the base. Those are pretty unusual colours for leds; maybe a white led with a coloured filter has been used. And are the valves non-functional? I would expect the base to get pretty hot with the filament at that end. Not a good environment for an led. LEDs in all sorts of oddball colours do exist, they're just a good bit more money & thus unpopular. NT |
#46
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CRT question
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