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  #1  
Old 16th November 2011, 09:45 PM
ssaliba ssaliba is offline
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Default ECF80 Heater Voltages

Hi all,

I recently made the Schottky Bridge MOD on the Kel84 and now the heaters of the ecf80 have a voltage of 5.9v. Ideally it's 6-6.3V right ? How bad is that? Will it have a noticable effect on the amp's first stage amplification ?

SS
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Old 17th November 2011, 12:16 AM
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pre65 pre65 is offline
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Default Re: ECF80 Heater Voltages

Personally I would not panic at 5.9v.
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Old 17th November 2011, 08:48 AM
bob orbell bob orbell is online now
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Default Re: ECF80 Heater Voltages

If it was a bridge in the first place using normal diodes, and now you have used sckottky diodes, before the change the voltage would have been lower, fast recovery diodes push the voltage up and normaly need a ballancing resistor, but like Pre 65 says, dont bother. BOB
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Old 18th November 2011, 10:58 AM
ssaliba ssaliba is offline
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Default Re: ECF80 Heater Voltages

Thanks guys for your replies. I changed the value of the resistor in the Pi filter and it's back to 6.2V. Thanks for your help though.
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