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#1
18th June 2020, 05:21 PM
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WAD PSU and No Heater voltage
Hi All
Well just powered up my WAD PSU and No Heater voltage  I get the 45v but no 6.3v any idea on this I have changed out the 5volt regThanks, Colin
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 The Blues man  Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member 
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#2
18th June 2020, 05:38 PM
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Re: WAD PSU and No Heater voltage
Hi Colin,
When you say you get 45V but no 6.3V I guess you are measuring between chassis and the heater rails, in which case the 45V is correct. First check the 9Vac from the transformer onto the PCB, by measuring directly across the PCB pins, then the 9Vac input into the heater bridge rectifier, then the 14Vdc approx dc out put from the bridge rectifier then the 14Vdc into the regulator finally the 6,.3V output from the regulator All the DC heater voltages must be measured from the -Ve side of the heater of the heater supply not chassis. Either the transformer is u/s, or the bridge rectifier is u/s or you just have a broken wire. John
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#3
18th June 2020, 05:49 PM
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Re: WAD PSU and No Heater voltage
Hi john
Just checked the TX and get 10v with no load 0 Volts at LED so looks like bridge rectifier is dead or broken track the PCB issue one has seen better day needs replaced and rebuilt really Thank john Colin
__________________
The Blues man Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member
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#4
18th June 2020, 06:10 PM
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Re: WAD PSU and No Heater voltage
I may have happened last week. I had inadvertently left it switched on and just turned it off the next day when I saw it was still on. think I will email matthew and see if he can let me have a new board as this one is passed it now
 Colin
__________________
The Blues man Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member
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#5
18th June 2020, 08:26 PM
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Re: WAD PSU and No Heater voltage
Colin, you may or may not know that the new board uses a LD1084 regulator and the heatsink is the chassis, it is fitted under the board not on top and requires a insulating kit, the two diodes are now redundant and replaced with a 130 R8 and 560 R9 ohm resistor. Bob
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#6
18th June 2020, 09:44 PM
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Re: WAD PSU and No Heater voltage
Quote:
Yep Matthew has got a new board and v-reg in the post for me didn’t know about the resistors though thanks for the update on that bob  Colin
__________________
The Blues man Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member
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