I recommend a little chart, like:
"VR1 clockwise= current up- offset positive"
"VR1 C/clokwise= current down- offset negative"
"VR2 CW = ********* "
Etc. for example...
It worked for me. 😉
Good luck.
M.
Think it sounds perfect. But only have cheap Dali until Monday. Speakers for upgrade with new bass.
What is the point for frying such as amplifier? In standard factor amplifying 26-30x, with 148V peak to peak is absolute overkill. Someone will say, you will became higher transition speed with higher voltage rail to rail. Nonsense, the material and topology inside current feedback amplifier are capable to serve up to 200V/uSEC or much more. The excellent bias for Exicons are about 150mA per transistor, so?
Brought the First One for our club. It was so much better than our old Holton ( one old model maybe 10 years). Harbeth 40.1 and Holton was really ****. First One and Harbeth 40.1 was fantastic.
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Anyone know the Brand/model, or part no of the MOSFET output devices used on the First One M Module?
redjr,
Please refer to this post:
https://www.diyaudio.com/forums/vendor-s-bazaar/248996-mosfet-amplifier-module-363.html#post4955960
Not sure if simply replacing the FET results in a working module again - you might want to folks on the thread if they've tried.
Please refer to this post:
https://www.diyaudio.com/forums/vendor-s-bazaar/248996-mosfet-amplifier-module-363.html#post4955960
Not sure if simply replacing the FET results in a working module again - you might want to folks on the thread if they've tried.
Hello!
I have a L module.
The manual for M module says that the VAS balance bias affects DC offset. When I set 120 mV beetwin Tr1-Tr2 and Tr3-Tr4, I get a 0.1 V offset at the output. It looks too mutch. But when I set 0 Volt at the output by adjusting VR2, then on the Tr 3-4 I get 170 mV.
How to do it right?
And one more problemme.
I can't get the output stage bias less that 360 mA. The VR3 is fully twisted counterclockwise. The temperature of heatsilk is 65C (Is not too mutch?). The power supply is +/-70V.
Please help me.
I have a L module.
The manual for M module says that the VAS balance bias affects DC offset. When I set 120 mV beetwin Tr1-Tr2 and Tr3-Tr4, I get a 0.1 V offset at the output. It looks too mutch. But when I set 0 Volt at the output by adjusting VR2, then on the Tr 3-4 I get 170 mV.
How to do it right?
And one more problemme.
I can't get the output stage bias less that 360 mA. The VR3 is fully twisted counterclockwise. The temperature of heatsilk is 65C (Is not too mutch?). The power supply is +/-70V.
Please help me.
I've just started building. I purchased a full set of cap banks of studley - can anyone tell me what the optional DUELUND silver bypass 0,01 uF/600 V in position C3 does if you add it in?
Also, anyone able to report on the percieved listening benefits? Worth the money on dueland?
Also, anyone able to report on the percieved listening benefits? Worth the money on dueland?
Thanks - lots of infromation / feedback on this on Audiophonics reviews humblehomemadehifi's CAP test. Benefit seems very worthwhile and immediate "Verdict: use them everywhere possible!"
Guys, when increasing capacitance for the stock SMPS, you can also try CLC approach. 😉
I tried this on another amp. As my FO is resting now.
Cheers,
M.
I tried this on another amp. As my FO is resting now.
Cheers,
M.
😀 No. It works perfectly. It's only that I have 4 experimental amps to test and improve. 😉
Not to mention source and speaker experiments...
Cheers,
M.
Progressing my First One Large stereo build with a single Hypex SMPS3kA700. A question about adding a push button switch (1NO1NC type).
I am looking to connect this front switch to J4.2 to enable the 'Amp Standby' function. Can I use the Vaux output on J4.3 to power this, or does this need to be an external power source?
Hypex SMPS3kA700 manual: https://www.hypex.nl/documenten/download/1778
What are thoughts on the amount of energy consumed using the AMP standby function - I guess it's no less than using a separate soft start?
Instructions for configuring Hypex's own soft start module are absolutely crystal clear, but the SMPS3kA700 manual is not 100% clear to me on how to intergrate this push button switch. Thanks for your help.
I am looking to connect this front switch to J4.2 to enable the 'Amp Standby' function. Can I use the Vaux output on J4.3 to power this, or does this need to be an external power source?
Hypex SMPS3kA700 manual: https://www.hypex.nl/documenten/download/1778
What are thoughts on the amount of energy consumed using the AMP standby function - I guess it's no less than using a separate soft start?
Instructions for configuring Hypex's own soft start module are absolutely crystal clear, but the SMPS3kA700 manual is not 100% clear to me on how to intergrate this push button switch. Thanks for your help.
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