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Re: Russ Sadler's dohicky
Posted: Fri Jul 19, 2019
by Doug Fisher
What is the maximum long life mA rating for your tube model number?
Re: Russ Sadler's dohicky
Posted: Sat Jul 20, 2019
by Gary Richardson
No idea, it's a cheapo tube with no data about it,
Russ said that for the dimensions of the tube (50 x 1250mm), it'll be a cheap 60 watter, and will run at 22mA,
Re: Russ Sadler's dohicky
Posted: Sat Jul 20, 2019
by Hank Morgan
Does the tube have any stickers on it with manufacturer and part number?
Re: Russ Sadler's dohicky
Posted: Mon Jul 22, 2019
by Gary Richardson
Not that i can see, on both the one in the laser and the broken one hung above the workshop.
might be able to find out the details of where it was bought from, but can't usually believe the info they say, as it was bought cheap to get the laser working again after the original tube died,
Re: Russ Sadler's dohicky
Posted: Fri Nov 08, 2019
by Leigh Dodd
Re: Russ Sadler's dohicky
Posted: Fri Dec 20, 2019
by Dave Vigness
Need an actual dimension of the pattern.
I'm using Corel / AutoLaser until I can justify the change over. When I brought the dxf pattern into Corel, it came in at 24" I know Russ said the center line is 'roughly' 12mm, and the program 'should' run for 20.5 seconds. BUT... a larger or smaller pattern would throw that timing off. Am I correct in setting the starting line for 12mm and scaling accordingly?
Re: Russ Sadler's dohicky
Posted: Sat Dec 21, 2019
by Gene Uselman
Russ' pattern is likely in MM, that might explain the size difference? I would advise buying one from Russ using the instructions earlier in this thread. I have a commercial meter and the exposure time is engraved on the case, it was obviously calibrated against a known standard.
Re: Russ Sadler's dohicky
Posted: Mon Jan 25, 2021
by Martin Berriman
I got around to using the DoHICky I bought from Russ tonight. Thought I'd post my results in case anyone is interested.
Do these results look sensible? I didn't get a reliable mA reading at the very low settings so I put them as zero in the data.
Martins DoHICky Test Results.png
Re: Russ Sadler's dohicky
Posted: Mon Jan 25, 2021
by Doug Fisher
FWIW, your curve shape looks generally similar to the one for my 80 watt tube.
Re: Russ Sadler's dohicky
Posted: Mon Jan 25, 2021
by fred ungewitter
That's an interesting set of curves. A quick search of the 'net suggests that for your tube power, 28 ma is recommended maximum, although at least one user goes no higher than 25 ma. If I read your graph correctly, 25 ma is 65 percent power and provides 80 Watts. That's impressive that your 80 W tube can provide 80W at a safe current draw for maximum longevity. Good for you!