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Fisher 800c selenium rectifier pictures
Fisher 800c selenium rectifier pictures
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Old 10th April 2009, 08:23 AM   #1
skiman762 is offline skiman762  United States
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Default Fisher 800c selenium rectifier pictures

I did a search and got why to change and how to change so
can someone post pictures of the 800c selenium rectifier so I can tell if mine is original I have a square bridge about 1 inch maybe a tad bigger square and maybe 3/8th inch thick mounted on the side.

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Old 10th April 2009, 09:12 AM   #2
chrish is offline chrish  Australia
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Maybe post a picture of what you have got, then someone can tell you if it is the selenium rectifier.
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Old 10th April 2009, 11:35 AM   #3
Frank Berry is offline Frank Berry  United States
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If the Fisher is like the old HH Scott amplifiers, the selenium is a bridge rectifier. The size is about correct.
There should be four connections. Two directly from the power transformer, one (the - output) to the electrolytic (possibly through a resistor) and the another (the + output) should be tied to chassis ground.
Hope this helps.
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Old 10th April 2009, 01:12 PM   #4
DigitalJunkie is offline DigitalJunkie  United States
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Does it look like a stack of square metal plates,with a space between each plate,kinda "finned" looking? If so,it's selenium.

Selenium rects on google images
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Old 10th April 2009, 02:07 PM   #5
Frank Berry is offline Frank Berry  United States
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The selenium bridge in the old HH Scott amplifiers is a flat pack ...
no fins. It has two solder terminals on one side and two terminals on the opposite side. It's mounted to the chassis with a small mounting bracket. Fisher may have used a similar bridge.
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Old 10th April 2009, 05:32 PM   #6
skiman762 is offline skiman762  United States
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Ok here's some pics
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File Type: jpg 800c 002.jpg (22.7 KB, 168 views)
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Old 10th April 2009, 05:32 PM   #7
skiman762 is offline skiman762  United States
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Mine looks like the bottom one in this picture
Heres the caption from the picture

Two old selenium rectifiers and on the foreground a modern silicium bridge rectifier
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File Type: jpg selenium.jpg (58.3 KB, 151 views)
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Old 10th April 2009, 06:59 PM   #8
Eli Duttman is offline Eli Duttman  United States
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FWIW, I suggest that no prisoners be taken and 4X 100 PIV Schottky diodes be installed. Remember, the negative rail does double duty providing O/P tube bias and heater power. "Zero" switching noise in the bias supply can't hurt and may help. An adjustment to the rail voltage is probably necessary, given the very small forward drop in Schottkys.
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