Yes the same question from me. ....................
I think RP401 is to adjust bias of Q401.....
BTW, How did you acquire schematic brother?
It has the same Circuitry as in Ahuja model 760.....🙂 which I have......🙂
In my amp recently, I lost control over Bass. The Bass control on my amp doesn't work at all. There is no bass in the output at speaker.... I am also on fixing the amp...;-)
I think RP401 is to adjust bias of Q401.....
BTW, How did you acquire schematic brother?
It has the same Circuitry as in Ahuja model 760.....🙂 which I have......🙂
In my amp recently, I lost control over Bass. The Bass control on my amp doesn't work at all. There is no bass in the output at speaker.... I am also on fixing the amp...;-)
This schematic was the last page of the manual given with the amplifier at the time of purchasing (in the year 2000) but now its (ahuja) not providing a schematic
Last edited:
adjust 1.1v voltage with rp501 on the base 0f Q501 Q502 and heat of output trans is stable this is perfect adjustment
Comasus,
RP401 is for feedback/gain adjustment for driving the intermediate transformer with proper excitation .
RP501 is bias control for output transistors.
RP401 is for feedback/gain adjustment for driving the intermediate transformer with proper excitation .
RP501 is bias control for output transistors.
Thank you for your reply sir
how to adjust these two for good output (no distortion)
Keep RP401 at mid position and set the bias thru RP501 till you get 400-450mV at the Base-Emitter junction of output devices Q504/503.
Sir
the voltage at base-emitter junction of output transistors is 1.2V when RP501 is minimum
when i put maximum it is increasing up to 2.7V at mid position of RP401
so what must be the biasing voltage?
You are surely doing your measurements wrong because 1.2V at B-E junction means a disaster, it will smoke the devices in no time.
RP401 has nothing to do with the calibration of Q503 and Q504. RP501 should be checked for malfunction instead, if you are getting that much high voltage.
RP401 has nothing to do with the calibration of Q503 and Q504. RP501 should be checked for malfunction instead, if you are getting that much high voltage.
Yes sir i have wrongly done my measurements as i confused in taking readings with my analog multimeter
i have set the bias to 500mV approximately
thank you sir for your co-operation and for paying valuable time by attention on to this...
if you dont mind i want to ask you as i didnt understand why you have said to adjust RP401 to mid position
what changes occur by increasing or decreasing it?
sorry for my bad english if any...
Last edited:
- Status
- Not open for further replies.