Filaments for the Aikido - diyAudio
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Old 2nd August 2005, 02:06 PM   #1
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Default Filaments for the Aikido

I need a linestage with a gain of about 20. This naturally suggests using a 12AY7 for the first totem of the Aikido (the 12AY7 has a mu of 40). Iíll probably use the JJ ECC99 for the second totem, to get some beefy output drive (plate impedance under 2.5k).

I want to use 300V on the power supply, which means each plate will be dropping about 150V.

Iím worried about the filaments. The 12AY7 is rated for 90V maximum cathode to filament voltage. Does this mean you canít stack 12AY7 in SRPP or other arrangements because of the filament limitation?

My other alternative is the 6N1P (mu of 35), which is capable of higher cathode to filament potentials.
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Old 2nd August 2005, 02:24 PM   #2
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If you lift the heaters to about 80v both cathodes will be within the 90V insulation limit. ...i.e. 75V up and down relative to the cathode.
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