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Old 24th September 2009, 03:11 AM   #1
sled108 is offline sled108  United States
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Default 6X5GT PS Problem

I'm Building an Amp with a 6X5GT PS. It has 114v at Pins 3 & 5, which is Right, and it's a CLCRC Supply...But it has -.8v at Pin 8...I've tried 3 other Rectifiers, but they all show -.8v at Pin 8....Are my Pin-Outs Wrong??...The Heaters Glow, so at least they're Pinned Right???...
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Old 24th September 2009, 03:33 AM   #2
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We need a schematic as we don't know the specific amp you have built.
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Old 24th September 2009, 03:54 AM   #3
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Quote:
Originally Posted by sled108 View Post
But it has -.8v at Pin 8...
between pin 8 and where exactly? If Pin 8 is at -0.8v, and your other test point is connected to the signal ground elsewhere in the circuit, the voltmeter is telling you you have a resistance between the rectifier cathode and the signal ground...
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Old 24th September 2009, 03:58 AM   #4
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Your pin outs are correct. Pin 8 is the cathode and you should have around +150VDC unloaded with respect to DC return/ground. Either all 3 tubes have an open cathode connection, which is unlikely, or your tube socket isn't making a connection at pin 8. Check that very carefully.
Is this a full wave with a center tapped transformer?
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Last edited by HollowState; 24th September 2009 at 04:03 AM. Reason: added question
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Old 24th September 2009, 03:58 AM   #5
sled108 is offline sled108  United States
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It is between Pin 8 and the AC Ground..
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Old 24th September 2009, 04:09 AM   #6
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ok - so now you have a 0.8v drop (or difference) between the AC safety earth and the DC signal earth. Is there a resistor or diode in that path? Or have you direct-connected the two earths?
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Old 24th September 2009, 04:12 AM   #7
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oops - . What hollowstate said...
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Old 24th September 2009, 04:19 AM   #8
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would a dead short to earth on Pin 8 do this too? ie load the rectifier so that voltage was pulled close to zero?
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Old 24th September 2009, 04:27 AM   #9
sled108 is offline sled108  United States
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Oh Well, Live and Learn...It would seem that I've totally Screwed the Poodle on this project...I tried to do the Back to Back 12.6v CT RS Transformer Trick..But I only have 114v between Pins 3 & 5.....Nothing between either of those and Ground...It really looks Nice & Glows Pretty though...
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Old 24th September 2009, 05:20 AM   #10
sled108 is offline sled108  United States
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How's this for Form Over Function? Maybe I can put a Diode Rectifier inside, and just keep the Heaters on the 6X5G?....
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