Magura said:
That's how it works, having your personal nanny
Magura
You mean I get to have Mrs. Magura work for me?
carpenter said:
You mean I get to have Mrs. Magura work for me?
I hate to tell you this....but that's just not happening! She's off the market for good
So as for a nanny, you'll have to put up with my services
Magura
Magura said:
I hate to tell you this....but that's just not happening! She's off the market for good
So as for a nanny, you'll have to put up with my services
Magura
I always thought of nanny as being female; that would make your a nanner....a nanoo-nanoo....ah hell, numb-nuts....
Re: New born
Very nice build! What? No snow in Bakersfield?
wirewiggler said:My f4 is born with its twin soon to be delivered, I will be adding a pumpkin to be their Nanny. Will have to wait - leaving for Vancouver in 30 minutes, drat have to ski all week.
Bill
Very nice build! What? No snow in Bakersfield?
Re: New born
Congratulations, Bill.
Good news from me too: yesterday my balanced f4 was born, the twin should be ready next weekend, I hope.
I would like to express my admiration for Mr. Nelson Pass project. Absolutely no problems with startup. I reach thermal stability during 25-30 minutes (50-55 C), with 250 mV bias and final excellent 0 V offset. No cracks, no bumps during power ON/OFF, cold or warm. Bias and offset adjustments are stable, every amp is like self-regulating system.
I listened it for a while, the sound is clear and nice, but at the moment this is one channel only and to quiet, driven directly from DAC by typical balanced line-level signal. As I suspected I must think about pre-amplifier, I decide to use ZenMod hand-made schematic (Post #1641), I will appreciate very much any suggestions regarding Power Supply (+60/-20V, DC).
I would like to share one of my adventures especially with novices. I start all four amps one by one separately, carefully checking voltages, bias, offset, heatsink temperature. Then I put together two amps as one balanced (goodbye my SOZ). When I switch power ON I discovered +23V at all metal parts of housing. That was a short-circuit through insulation pad caused by a piece of metal filing. In other words one of IRFP240 was connected directly to the heatsink by a very small piece of metal. Fortunately nothing wrong happened, I replaced the pad and everything is okay now. Here is the proposal dedicated to all novices (and old-hands smart guys like me): before switching power ON check if drains of all power MosFets are electrically well isolated from heatsink.
Best Regards,
Andrzej
wirewiggler said:My f4 is born...Bill
Congratulations, Bill.
Good news from me too: yesterday my balanced f4 was born, the twin should be ready next weekend, I hope.
I would like to express my admiration for Mr. Nelson Pass project. Absolutely no problems with startup. I reach thermal stability during 25-30 minutes (50-55 C), with 250 mV bias and final excellent 0 V offset. No cracks, no bumps during power ON/OFF, cold or warm. Bias and offset adjustments are stable, every amp is like self-regulating system.
I listened it for a while, the sound is clear and nice, but at the moment this is one channel only and to quiet, driven directly from DAC by typical balanced line-level signal. As I suspected I must think about pre-amplifier, I decide to use ZenMod hand-made schematic (Post #1641), I will appreciate very much any suggestions regarding Power Supply (+60/-20V, DC).
I would like to share one of my adventures especially with novices. I start all four amps one by one separately, carefully checking voltages, bias, offset, heatsink temperature. Then I put together two amps as one balanced (goodbye my SOZ). When I switch power ON I discovered +23V at all metal parts of housing. That was a short-circuit through insulation pad caused by a piece of metal filing. In other words one of IRFP240 was connected directly to the heatsink by a very small piece of metal. Fortunately nothing wrong happened, I replaced the pad and everything is okay now. Here is the proposal dedicated to all novices (and old-hands smart guys like me): before switching power ON check if drains of all power MosFets are electrically well isolated from heatsink.
Best Regards,
Andrzej
Re: Re: New born
just one observation - that's regular praxis for non- novices
I'm glad that you are pleased with new toys ........... entering new dimension in favorite tunes is always overwhelming experience ........ and I'm sure that you have that now
Andrzej Sochon said:.......................... Here is the proposal dedicated to all novices (and old-hands smart guys like me): before switching power ON check if drains of all power MosFets are electrically well isolated from heatsink.
Best Regards,
Andrzej
just one observation - that's regular praxis for non- novices
I'm glad that you are pleased with new toys ........... entering new dimension in favorite tunes is always overwhelming experience ........ and I'm sure that you have that now
I am building the Pumpkin preamp with balanced output as mentioned in the other thread. I also intend to use a balanced DAC as the source.
I do have 2 pairs of F4 PCB but am intending to only build a stereo pair for the time being. The reason being I listen to music at relatively low volume and my speakers are 93db sensitive. I hardly use the 8W from my old tripath amps for these speakers and I'm sure the 25W from the F4 is more than enough.
Also have 2 huge heatsink chassis of Class A amplification is probably not sit well with my wife.
So how big a improvement will a dual mono-block setup be if I don't need the power?
her shann
I do have 2 pairs of F4 PCB but am intending to only build a stereo pair for the time being. The reason being I listen to music at relatively low volume and my speakers are 93db sensitive. I hardly use the 8W from my old tripath amps for these speakers and I'm sure the 25W from the F4 is more than enough.
Also have 2 huge heatsink chassis of Class A amplification is probably not sit well with my wife.
So how big a improvement will a dual mono-block setup be if I don't need the power?
her shann
hershann said:So how big a improvement will a dual mono-block setup be if I don't need the power?
Dual mono blocks? What is the reason you heard about?
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