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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 7th December 2013, 11:26 AM   #61
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Originally Posted by frankwilker View Post
Hi quanghao,

i have some questions. At the output is used a 4,7uf Capacitor. Why are you using this large value?
The capacitorat the grids are 1k. I think its the protection for oscillation. So this value is not critical. I want to use 150 Ohm, cause i have this in stock.

with best regards
Well ! thank you!

parallel installation of multiple tube, with my experience 4.7uF or greater value to 6uF, will sound impressive bass solution, more capacitors 0.01uF create the subtle sound high!

You can use the R value from 100 to 2K, no matter what!
Wish you success!
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Old 8th December 2013, 06:36 AM   #62
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Location: Duisburg
thank you. I will tell you about the sound.
with best regards
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Old 16th December 2013, 08:51 PM   #63
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Join Date: Sep 2009
What is the approximate cost to populate this board? I'm looking to build a good valve pre. Was considering the Bottlehead foreplay, but it is quite expensive to get shipped to UK.

Many thanks - LB
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