12AU7 -> 12BH7 Do I need to change Rp? - diyAudio
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Old 28th February 2005, 04:06 PM   #1
zxx123 is offline zxx123  United States
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Default 12AU7 -> 12BH7 Do I need to change Rp?

I have a 12AU7 preamp. From an article in this diyaudio, I change 12AU7 into 12BH7. <p>Wow, I feel wider sound range and more linearity. <p>However, I hear more white noise....I think it gives more gain.<br>Do I need to change Rp for original 12AU7?
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Old 28th February 2005, 05:30 PM   #2
SY is offline SY  United States
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You might need to change the cathode resistor. What are the current values of Rk and Rp? And what is the B+?
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Old 28th February 2005, 05:38 PM   #3
zxx123 is offline zxx123  United States
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Default Well..

Thanks...

I do not open it yet because I need a special tool. So, I did not know its exact values of resistors.
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How about this? 12AU7 is used for PI of 6V6PP. If I feel 12BH7 better than 12AU7, I will abolish all 12AU7s in my system.
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Old 3rd March 2005, 12:41 PM   #4
Tubesin is offline Tubesin  Macao
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Usually U7 and BH7 can be exchanged without any change to the components value, special in a preamp, however, have you checked the BH7 is noisy or not?
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