Mic, Line, EQ... Preamps

[abetir]

Originally Posted by DAMANHURI

Nice job Sir,
what do you use TIP for this PSU?

Hi! Damanhuri,

TIP41c & TIP42c, 2sk246 for the FETs, it was suggested by Sir Mile as substitutes.

Regards!

[koming]

hi apex... can u share schema led vu display like on this amp...?.

[DAMANHURI]

Originally Posted by abetir

Hi! Damanhuri,

TIP41c & TIP42c, 2sk246 for the FETs, it was suggested by Sir Mile as substitutes.

Regards!

thank you for the information.

[patnaik_kottakki]

Originally Posted by rakesh_sharma23

I have tried 50K pots but no improvement.. Even replaced the TL IC with two new ones, both purchsed from different vender... Still bass is not low as with the Lowpass circuit.

If any one else can try it.. may be all TL ICs can be faulty..

Waiting for reply from members...

Rakesh Sharma

hi sir. the filter which you are regarding is been tested by you?? how is the sound?? can we use MC4558 ic instead of TL072?? plz reply

[ravpreet420]

hello apexaudio

ml3 nice sound crystal clear sound & bass ,but i m wanted more deep sound from mid .
what can i do change ?

[maouna]

Hello APEX .
I made your auto range VU and i have a question about the clipping indicator led. i tested it with a power supply of +33V and the input of the VU connected at a voltage divider. i was expecting that the red led would turn on when the voltage at the input was equal to the supply voltage of 33V,but it turned on quite lower at 26V. Why is that?

[apexaudio]

Originally Posted by ravpreet420

hello apexaudio

ml3 nice sound crystal clear sound & bass ,but i m wanted more deep sound from mid .
what can i do change ?

Use 100nF instead 47nF.

[apexaudio]

Originally Posted by maouna

Hello APEX .
I made your auto range VU and i have a question about the clipping indicator led. i tested it with a power supply of +33V and the input of the VU connected at a voltage divider. i was expecting that the red led would turn on when the voltage at the input was equal to the supply voltage of 33V,but it turned on quite lower at 26V. Why is that?

Most amps have cliping level when output voltage is about 6V under rail voltage.

[maouna]

Most amps have cliping level when output voltage is about 6V under rail voltage.

and if i want it to turn on at about 3V under rail voltage what should i change?

[44250]

APEX TUBE preamp files for pcb done by viktor1986,thanks Mile and thanks Viktor!