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Old 18th July 2019, 08:10 PM   #911
redjr is offline redjr  United States
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Believe I have everything adjusted correctly now. Thanks! BTW, what is the power output I could expect with this amp using +-45VDC?
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Old 18th July 2019, 08:49 PM   #912
shaan is offline shaan  India
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Good to know you got it running.

You can expect 100w/170w into 8r/4r load.
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Old 22nd July 2019, 11:54 AM   #913
gionag is offline gionag  Italy
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How can i have a set for two monoblock amp ? (or a stereo one...)

thanks
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Old 22nd July 2019, 01:00 PM   #914
shaan is offline shaan  India
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Quote:
Originally Posted by gionag View Post
How can i have a set for two monoblock amp ? (or a stereo one...)

thanks
M.
You have PM.
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Old 23rd July 2019, 01:59 PM   #915
redjr is offline redjr  United States
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Default 2R Work?

shaan,

Would 2R 2watt resistors work for R13-R16 on the PSU board?
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Old 23rd July 2019, 02:13 PM   #916
shaan is offline shaan  India
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Quote:
Originally Posted by redjr View Post
shaan,

Would 2R 2watt resistors work for R13-R16 on the PSU board?
Would be a little higher than appropriate. Lower values than shown in schematuc will be fine for class ab amps.
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Old 23rd July 2019, 02:17 PM   #917
redjr is offline redjr  United States
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Quote:
Originally Posted by shaan View Post
Would be a little higher than appropriate. Lower values than shown in schematuc will be fine for class ab amps.
Ok. I'll order some 1R/5W resistors.
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Old 27th July 2019, 06:45 PM   #918
delange is offline delange  Belgium
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Hi Shaan,

My second channel is slowly coming to a completed state. I need to solder the mosfets and mount everything against the heatsink.
In the mean time, my first channel has been playing in my main stereo system. The amp is behaving very well. Compared to my Q-Watt amplifiers, the VH1 produces a deeper bass (probably due to the fact that it is DC coupled).

I would like to experiment with the mosfet biasing. Do you know how the amp behaves with half of the suggested bias current (ie 100mA instead of 200mA)?
I'm asking because when the environment temperature is high (last week was crazy over here) the amp gets really hot even at normal listening levels.

Thanks!
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Old 27th July 2019, 07:05 PM   #919
shaan is offline shaan  India
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Quote:
Originally Posted by delange View Post
Hi Shaan,

My second channel is slowly coming to a completed state. I need to solder the mosfets and mount everything against the heatsink.
In the mean time, my first channel has been playing in my main stereo system. The amp is behaving very well. Compared to my Q-Watt amplifiers, the VH1 produces a deeper bass (probably due to the fact that it is DC coupled).

I would like to experiment with the mosfet biasing. Do you know how the amp behaves with half of the suggested bias current (ie 100mA instead of 200mA)?
I'm asking because when the environment temperature is high (last week was crazy over here) the amp gets really hot even at normal listening levels.

Thanks!
Hi.

Sound doesn't change much after 50mA. So 100mA should not change the sonics much.
200mA is suggested so that we can be sure that both N+P mosfet pairs are well into conduction even if not matched and closer to their temperature coefficient inversion point. But yes in warm ambience it does get a little hot with a 56V supply and 22W idle dissipation.
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Old 9th August 2019, 07:45 PM   #920
delange is offline delange  Belgium
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In the meantime, my second channel is running. During setup I adjusted the mosfet bias to 110 mV across the 1R resistors.
After setup was complete I let the amp warm up again and checked bias current by measuring the voltage across the source resistors. And sure, about 50mA per mosfet.

Distortion measurements are the same as with the 100mA bias current. And the amp spits out 142 watts into 8 ohms just before clipping. Next up listening test: I honestly can't hear any difference between the two setups.
I think I'll bring down the bias current of my first channel too. The amp runs a lot cooler with 50mA bias (per mosfet).

Love the deeper base that the PeeCeeBee amplifier produces!
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