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This topic comprises 4 pages: 1 2 3 4
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Author
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Topic: Rectifier Diodes
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 08-15-2002 01:10 AM
Mark and Steve:BAH! I think Christie rectifiers used in their newer consoles are the greatest thing since sliced bread! The bulb life I got out of those things approach 6000 hours on a consistant basis! Must be something good about it. OK - flame me. 
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John Walsh
Film God
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 08-25-2002 10:37 AM
Sorry to drag this topic up again, but I thought I'd take new readings and see what the ripple was on our current IREM supplies. As far as ripple in IREM's, it looks like things haven't gotten any better. In the IREM documentation, they generally claim their supplies will have no more than %9 ripple, but we're way past that on most units. Pete N. had an interesting point that maybe the power cycle rate (50hz vs. 60hz in the US) might be a factor, but I would think that the US's higher rate would help reduce the ripple.Before I condemn them though, (and start trying to improve some of the worst ones) I like to be sure I'm doing the measuring correctly. I think my scope is OK, but I'm not sure about the shunts in the consoles. Does anyone know where I can buy an accurate shunt? I can't very well go to ORC and say: "Can I use your shunt to test Xetron lamps?"  Although, even if my scope was out of calabration and the absolute values are wrong, (Imax vs. Imin) the readings are relative to each other. So, I sort of have to conclude the ripple is as bad as I'm seeing. The data: Aud IREM Year Imax Imin Ripple
Aud 1 G3X-100 1993 32 27 15.63
Aud 2 G3X-100 1993 33 28 15.15
Aud 3 G3X-100 1993 31 26 16.13
Aud 4 G3X-100 1993 31 27 12.90
Aud 5 D3X-141 1983 36 31 13.89
Aud 7 G3X-100 1993 31 27 12.90
Aud 8 G3X-100 1993 32 29 9.38
Aud 9 G3X-100 1993 30 27 10.00
Aud 10 G3X-100 1993 32 29 9.38
Aud 11 G3X-75 2000 23 20 13.04
Aud 12 G3X-75 2000 25 22 12.00
Aud 14 G3X-131 2000 32 29 9.38
Aud 15 G3X-131 2000 32 28 12.50
At another theater:
Aud 1 G3X-100 1995 32.5 29 10.77
Aud 2 G3X-100 1995 32 30 6.25
Aud 3 G3X-100 1995 29 27 6.90
Aud 4 G3X-100 1995 27 25.5 5.56
Aud 5 G3X-100 1995 32 25 21.88
Aud 6 G3X-100 1995 32 29 9.38
Aud 7 G3X-100 1995 33 30 9.09
Aud 8 G3X-100 1995 24 21 12.50 IREM = IREM model number
Year = year purchased
Imax / Imin is in millvolts,
measured across the shunt w/ Tex 465 scope ripple = (Imax - Imin) / Imax * 100
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