Finaly fired up one channel,very nice sounding amp indeed.Only one miner thing input level is too low how do I increase this?
You mean you want more gain? You can reduce the 100R resistors in the FB network to achieve a higher gain. Do you know the output level of your source? If you can provide that I can make a specific suggestion.
Yes ,I do mean more gain.Output level of the pre is 1V
This is my testing pre amp(mini pre amp Elector) which I can use for all of my amps with no problem only for this amp it is too low.
This is my testing pre amp(mini pre amp Elector) which I can use for all of my amps with no problem only for this amp it is too low.
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There are two ways.
1) Change R7 and R10 (the 100Ω in the FB network) for either 82Ω (or 75Ω if you need a little more gain still).
OR
2) Change R8 and R9 (the 2.2kΩ in the FB network) to 2.7kΩ.
Either will bring the gain up a little so it better matches other components in sensitivity.
1) Change R7 and R10 (the 100Ω in the FB network) for either 82Ω (or 75Ω if you need a little more gain still).
OR
2) Change R8 and R9 (the 2.2kΩ in the FB network) to 2.7kΩ.
Either will bring the gain up a little so it better matches other components in sensitivity.
Strange, what other amps are in your system? My VSSA is very close in output level to most all of my amps. The only ones that have much higher gain are the DX amps and maybe my Symasym. Those were all intended to be used without a pre.
An other question does it need an output coil ?
This is the first amp I'm encounter this
This is the first amp I'm encounter this
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Shouldn't need it. It does have a zobel, but if you want to add a coil then add it at the speaker terminals just inside the case (in parallel with 10R as per usual practise).
Update : Reason for the low gain is because I soldered the wrong value instead of 100 R I used 100M R
Great mistake😀😀😀😀
Find this out cause the other channel was correct with enough gain
Find this out cause the other channel was correct with enough gain
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Ok, so one was effectively a unity gain buffer. If it meets your needs I would suggest using the 100R.
After testing the second channel which had enough gain I replaced the resistors(R7-10) of the first channel with the right value and also enough gain now.
You see a mistake is quickly made.
You see a mistake is quickly made.
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