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diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 30th August 2014, 06:29 PM   #111
AndrewT is offline AndrewT  Scotland
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Definitely wired wrong.
The mains current enters the tester plug top goes THROUGH the bulb filament to the tester socket. If any switch is open or the bulb removed, the resistance MUST measure open circuit.
The Neutral from Tester Plug to Tester Socket should ALWAYS measure <<0r1
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Old 30th August 2014, 07:09 PM   #112
richluvsound is offline richluvsound  United Kingdom
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As soon as I connect the transformer I get problems ….. Wired the neutral to one primary and live to the other primary ?
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Old 30th August 2014, 07:11 PM   #113
AndrewT is offline AndrewT  Scotland
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The Neutral through the bulb tester should measure 0r0 or very close.
The Live through the bulb tester should measure the cold resistance of the bulb.
Check these.
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Old 30th August 2014, 07:15 PM   #114
richluvsound is offline richluvsound  United Kingdom
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Neutral = 47r1 , Live = 0r

thats reversed ….. ?
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Old 30th August 2014, 07:18 PM   #115
AndrewT is offline AndrewT  Scotland
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Wrong !

BTW,
47r1 for a cold 100W filament seems about right.
Should be around 580r HOT !
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Old 30th August 2014, 07:18 PM   #116
Speedskater is offline Speedskater  United States
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Light bulb tester thread:

Light Bulb Tester
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Kevin
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Old 30th August 2014, 07:18 PM   #117
6L6 is offline 6L6  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Rich -

You mentioned that you have the bulb-tester on the secondaries - just to clarify, the bulb-tester should be wired in the place of a mains lead from your wall to the amp's IEC (or whatever you have for mains inlet.)

The first place to check is the wiring of the transformer secondaries to the bridges... an error there will immediately blow fuses. Specifically if you have a secondary wired with the winding phase turned 'inside-out'.

I'm flying the next 2 days, but can skype on Monday.
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Old 30th August 2014, 07:29 PM   #118
AndrewT is offline AndrewT  Scotland
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Remove all the white wires.
Wire Brn from Plug Top to Bulb Holder.
Wire Wht from Bulb holder to LIVE of socket.
Wire Blu from Plug Top to NEUTRAL of socket.

Only the switch in the socket and the bulb filament is in the LIVE half of the bulb tester.
There should be nothing in the Neutral from Plug top to socket.

Remeasure the resistances.

Report back.
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Old 30th August 2014, 07:44 PM   #119
richluvsound is offline richluvsound  United Kingdom
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Thanks 6L6 ….. I'll be around .


Andrew ,

I have wired the plug and bulb socket as suggested….. I think I need to get a new bulb socket ( this one has a bayonet ,with a threaded bulb adapter ) ….. I'll do that in the morning .


Richard
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Old 31st August 2014, 11:45 AM   #120
richluvsound is offline richluvsound  United Kingdom
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….. New bulb socket . Still get a circuit with the bulb removed and the switch off …. musty be the plug socket ?
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