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Chip Amps Amplifiers based on integrated circuits

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Old 11th February 2009, 11:01 PM   #31
Luck is offline Luck  China
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Hi Oshok,
Do you have a schedmatic for your tube preamp.?
Here i use 180 volts for the SRPP preamp.
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Old 3rd March 2009, 01:41 AM   #32
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lm3886 inside..hehe....it's working,sounds nice!
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Old 3rd March 2009, 02:43 AM   #33
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Sorry about the delay. I don't have the circuit on this computer but it's quite simple. Its a 6DJ8 with a ccs anode load and a cathode resistor with no bypass capacitor. The ccs is a simple two transistor circuit with a BC556B and a MJE350. Output is coupled with a film cap. Power supply has a capacitance multiplier ( no voltage regulation ).
I run the tube at about 5mA IIRC.

Smooth sound but loss of dynamics compared to the chip on it's own. Mid-range seemed to be nicer with the tube !

Cheers.

Nice setup. But I guess a bit fiddly to assemble ?
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