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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 |
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 |
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 |
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 |
CRT question
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