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  #1  
Old 15th June 2009, 08:20 AM
electren84 electren84 is offline
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Exclamation Kel84 help!!

Hello my friends I recently completed my kel84 kit , however when I pressed the power button nothing seems to be working!!! First of all the led turns red and after a few seconds it stops shining and drops dead. Then a very low noise like a hum starts and of course when i plug in my cd player it does not amplify. Instead only the noise continues. I have to say that I did the dc heater upgrade modification and used the pi filter as well . I briefly checked some voltages and they seem to be ok for example the dc heater voltage was around 7.1 Volts. Does anyone have a clue of what my problem might be? I will run some more tests and inform you about any other results. I am thanking you in advanced for your proposals.
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  #2  
Old 15th June 2009, 09:49 AM
electren84 electren84 is offline
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Default Re: Kel84 help!!

I should also add that the preamp tubes do not seem to glow as much as seen on pictures in this forum . I don't know if that helps.
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  #3  
Old 17th June 2009, 05:26 PM
David Mccallum's Avatar
David Mccallum David Mccallum is offline
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Default Re: Kel84 help!!

Sounds like you need to go over everything again, especially the driver tubes heater circuit - id stick to the original circuit though and if you get a result with that then fine try some mod's if you want to at a later date.

You wont know if you've improved anything if you dont listen to the un-modified amp for a while.

Be careful working with a live amp, a shock aint nice.

If still no joy phone WD, they are good at this.

Good luck
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  #4  
Old 18th June 2009, 03:46 PM
electren84 electren84 is offline
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Default Re: Kel84 help!!

It was nothing, in the end the preamp tubes were crappy , so I replaced them and the amplifier sounded just right. I also had the led wrongly wired but these things happen.
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