Although I have been using a converted 16mm to run the GS1200 lamp for the last few years. I came across another slide projector Leitz Pradovit 253series that was being scrapped. The mechanics had given up working long ago, along with a burnt out lamp socket. I pulled it apart mainly for the transfomer. Its been a little project to make up another power supply just for the fun of it. The only thing I bought for it was a 15 amp illuminated rocker switch. Yesterday I finished it and compared the voltage output with the old B/H power supply.
To my surprise with a 24volt 250watt lamp running the voltage drop was more than I thought it would be on low 20VAC on high 21.5VAC. Although the Leitz Pradovit slide projector never had a choice of low and high, only high. I did find a lower tapping. Checking the voltage again this time with the transformer from the Leitz and with the 250watt lamp running I got 22VAC on the low and a 23.5VAC on the high, ah! that's better.
So now I have retired the old X B/H 16mm power supply with this one. I will run the Osram Xenophot ELC 24volt 250watt lamp at the 23.5VAC from now on and se how that works out.
To be honest I had forgotten about the voltage drop when the lamp was on, although the old B/H did show 24 volts without the lamp running I did not think it would drop that much, adding another 2 volts bringing it up to a running voltage of 23.5VAC should be bit brighter. A good test would be some Scope films for home use this should be fine
Glad to be at the end of projects both at the Historic Park and home, time to chill out
To my surprise with a 24volt 250watt lamp running the voltage drop was more than I thought it would be on low 20VAC on high 21.5VAC. Although the Leitz Pradovit slide projector never had a choice of low and high, only high. I did find a lower tapping. Checking the voltage again this time with the transformer from the Leitz and with the 250watt lamp running I got 22VAC on the low and a 23.5VAC on the high, ah! that's better.
So now I have retired the old X B/H 16mm power supply with this one. I will run the Osram Xenophot ELC 24volt 250watt lamp at the 23.5VAC from now on and se how that works out.
To be honest I had forgotten about the voltage drop when the lamp was on, although the old B/H did show 24 volts without the lamp running I did not think it would drop that much, adding another 2 volts bringing it up to a running voltage of 23.5VAC should be bit brighter. A good test would be some Scope films for home use this should be fine
Glad to be at the end of projects both at the Historic Park and home, time to chill out
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