Replacing a 12AU7 in a cathode-follower. - Page 6

Salas · 27th March 2007, 08:11 PM

Yes, 10 mA for 12BH7 and ECC99 is enough to enter their comfort sonic zone. In 12AU7 cathode followers, its more common to see 5mA.

beppe61 · 28th March 2007, 09:05 AM

Originally posted by salas

Yes, 10 mA for 12BH7 and ECC99 is enough to enter their comfort sonic zone.
In 12AU7 cathode followers, its more common to see 5mA

Thank you very much for the helpful advice.
I will try to calculate/measure the present bias current.
Kind regards,

beppe

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27th March 2007, 08:11 PM	#51
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Yes, 10 mA for 12BH7 and ECC99 is enough to enter their comfort sonic zone. In 12AU7 cathode followers, its more common to see 5mA.

28th March 2007, 09:05 AM	#52
beppe61 diyAudio Member Join Date: Feb 2005 Location: torino	Originally posted by salas Yes, 10 mA for 12BH7 and ECC99 is enough to enter their comfort sonic zone. In 12AU7 cathode followers, its more common to see 5mA Thank you very much for the helpful advice. I will try to calculate/measure the present bias current. Kind regards, beppe

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