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Old 18th March 2011, 05:44 PM   #11
T Leung is offline T Leung  Hong Kong
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Location: Hong Kong
The other post

http://diyaudioprojects.com/Solid/Tu...Headphone-Amp/

use IRF610.
I have extra IRF610, may I substitute IRF830 with IRF610 in here? if yes, Any consequent components' values to change ?

Last edited by T Leung; 18th March 2011 at 05:47 PM.
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Old 17th September 2012, 07:33 AM   #12
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by ashok View Post
I checked the circuit. The 12au7 will work as is but it will have far more distortion. Running it at a higher plate current will be better say around 1 mA at least.

Make R3 = 820 ohms and R4 = 4.7K if you plan to use the 12au7. It should sound good. You will have to try out the 6DJ8 or any other tube to see how good (or bad) the 12au7 is. IMHO the sound depends on more than just the tube and so you can't trash the 12au7 because it sounds bad elsewhere. Maybe that was the wrong application ! Here I think it should be OK .
Remember that gain is less than one ( about 0.85 or so ). Distortion at 0.707volts (rms) input is just over 0.1%. Looks like you can feed about 5 volts peak at the input without clipping into 1M load.
Cheers.
ashok.
Hi ashok!
What should I change the schematic if the buffer with C5N instead of using PCC88 .
I can go with vekim voltages to the example of + /-30V?
thank you
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Old 17th September 2012, 08:14 AM   #13
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by Gost22 View Post
Hi ashok!
What should I change the schematic if the buffer with C5N instead of using PCC88 .
I can go with vekim voltages to the example of + /-30V?
thank you
P.S.
Instead C5N should be 6DJ8, instead "vekim" should be higher!
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