No,scope before the output coil😉
Valery,YOU & Jeff you have done a Very good job, congratulations!
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Ah! Of course. OK. I like it!
It is designed to sound delicious - relatively low loop gain, minimum compensation, high open loop linearity. Hope you will like the sound!
How is the heatsink temperature during your tests?
It is designed to sound delicious - relatively low loop gain, minimum compensation, high open loop linearity. Hope you will like the sound!
How is the heatsink temperature during your tests?
The main heatsink tempreture is 48C° (when this main heatsink isn't in the right vertical position,)
Tempreture on IPS heatsink(VAS) is 66c°😡 Probably a larger heatsink will do the job
>> on output drivers heatsink is 56c°😡 The same for this
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OK. Not cool, but acceptable. I will think about certain tuning the IPS up for cooling it down in the future.
I was planning to use the taller version of the heat sinks for the drivers, but was out of stock when I shipped the parts out. This is likely a good idea. I layed out the VZ-X4 input board with a large custom heat sink in mind, but ended up with the TO126 transistor orientation reversed for this. I might rework this one for the larger heat sink again.
Yes real world tests are great. Thanks. I've been putting off real world testing of mine until I get proper transformers, but that's been a four month wait already.
I think this input will be a problem as is when it goes into a chassis with reduced air flow. The electrolytics are going to bake pretty badly as is too. It shouldn't be too hard to shuffle parts around and come up with a good billet heat sink profile to cool it.
I think this input will be a problem as is when it goes into a chassis with reduced air flow. The electrolytics are going to bake pretty badly as is too. It shouldn't be too hard to shuffle parts around and come up with a good billet heat sink profile to cool it.
We will also slightly reduce the currents down to 5mA for those TO-126 ones - they are around 7.5mA now, I believe, which is a little bit excessive. Just a matter of changing some resistor values.
Yes you are right,the enclosure will be a problem with this temperature conditions.😡
Yes that would help a lot too. I'm looking forward to giving this one a proper audition. It sounds great on the test bench!
Be carefull,i ended up with a burning woofer😡
My last test woofer is death.
I can't resist to play loud
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Be carefull,i ended up with a burning woofer😡
My last test woofer is death.
I can't resist to play loud
Just too loud or did you get DC on the output?
We'll have to get you set up with the proper protection system to go with these amplifiers next.
We will ask Valery,is it possible this amplifier send a large d.c voltage to the load(due to overdriving ) and then play again well?
This occurs when +/-50v power supply used.
The previous test using +/-30v hasn't nothing bad.
Now i'm using a clip indicator for sure😉
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I actually cannot imagine this kind of behaviour. Unless there was some short term rail "flickering". Even in this case the offset should not be high...