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Old 4th February 2006, 12:15 PM   #11
SHiFTY is offline SHiFTY  New Zealand
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Holy overkill batman!

Ever considered using something like an 83 instead?
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Old 4th February 2006, 01:17 PM   #12
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Quote:
Originally posted by zarniwoop

Hg rectifiers seem like kinda of a PITA though, just to see the nice blue glow.

Certainly true if are only after the blue glow. If, otoh, you also care about the sound you might find no other rectifier sounds so good.
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Old 4th February 2006, 01:17 PM   #13
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Thanks everyone, I cant wait to test these things!

Cheers
Craig
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Old 4th February 2006, 02:28 PM   #14
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Chris,

My 'good' tester is a Stark 9-66. I am quite sure it has a 5U4 inside, but it has been a very long time since I looked. What Hg rectifier type is in yours? Aren't they arranged horizontally in that tester? That would be a no-no for the larger Hg tubes. I know there was a smallish Hg full wave (dual) rectifier made like a 5Y3 or 80, called a 82 and 83. I have one or two of these NIB.
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Old 4th February 2006, 02:38 PM   #15
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Craig,

That big rectifier tube you have appears to be about the same size as a 572. That is a powerful rectifier good for 1.25 Amps continuous. Max voltage drop is listed as 10 volts. The 572 needs 5 volts at 7.5 amps on the heater/cathode. The tube needs a minimum of 5 minutes to reach operating temperature before anode voltage can be safely applied.

I do not know for sure that you have a 572 type. I have some and yours looks quite similar.
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Old 4th February 2006, 03:32 PM   #16
anatech is offline anatech  Canada
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Hi Rob,
Indeed, your Stark should use an 83 rectifier in it. It is mounted horizonally. I have the schematic somewhere for it if you need. The other tube is a 5Y3. It has a *.DJU extension, so I can't attach it.

-Chris
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Old 14th February 2006, 02:34 AM   #17
garbage is offline garbage  Singapore
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i have used the 83 in my 300b amps and also 866 in a preamp (i know, overkill. pic attached below.).

just remember to warm the filaments before applying B+ (sakuma san's circuits also has a delay switch on B+ when 83s are used. delay also recommended as per tube datasheet recommendation.). you can do this with dedicated power trans to the rectifier's filaments or using a double pole triple throw switch.

Click the image to open in full size.
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