I want to build the Pass Delite amp with an 80v supply,using a constant current source instead of light bulbs. I was wondering which of the already made designs in the Pass diy site suit this best?
That would work fine, although ZV9 is not a constant current source.
If you have an 80 volt supply you may find that the current source and/or
gain devices run very hot. Most of the 80 volts is intended to be dropped
across the light bulb. With a current source you probably want to get down
to 40 to 50 volts.
😎
If you have an 80 volt supply you may find that the current source and/or
gain devices run very hot. Most of the 80 volts is intended to be dropped
across the light bulb. With a current source you probably want to get down
to 40 to 50 volts.
😎
Thanks Nelson, I will take another look at the many power supplies on your diy site and choose one in the 40-50v range.
Looking back at the ZV9 there are 10 pages of discussion, with different variations of power supplies,one is a cascode type and another called an ALEPH current source with 50v supply down to 23v on the drain the amplified fet.Would the ALEPH current source be a good choice for an alternative to the light bulbs in the delite amp,I'm using the IXTH6N50D2.
Yes, it would be a good alternative. Some AC gain on that source as presented
will help the Ixys part out a bit in the distortion department.
😎
will help the Ixys part out a bit in the distortion department.
😎
When using a depletion mode device with CCS instead of a load resistor, what determines the drain potential of the amp? If the CCS is stiff enough, does the load detemine drain potential while the CCS gets ignored?
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There will be a 100 ohm resistor across the output which will be the load reference,additional negative feedback can help reduce it more, but I will listen to it without first,I usually listen to tube amplifiers anyway so I'm not worried about finite levels of distortion.
OK now I'm confused, does the depletion fet need a resistive load at the drain,like the simple lightbulb circuit or is the ALEPH CCS going to work fine anyway, in the circuit I saw there was a resistor across the output?
ZV9 ALEPH CURRENT SOURCE
I was just wondering if there were ever boards made for the ZV9 ALEPH design, to simplify construction or can they be ordered from somewhere?
I was just wondering if there were ever boards made for the ZV9 ALEPH design, to simplify construction or can they be ordered from somewhere?
delite amp
I think I'm going to frankenstien a beast some of Nelsons ideas and some of my own, and when I come back from the depths of my basement I will report on the strange new life I have created!😀
I think I'm going to frankenstien a beast some of Nelsons ideas and some of my own, and when I come back from the depths of my basement I will report on the strange new life I have created!😀
I was thinking about the same thing. I might try a delight with a choke load instead
of a light bulb. As I understand it if I use a choke load I would set the bias at about
1/2 the peak output current.
of a light bulb. As I understand it if I use a choke load I would set the bias at about
1/2 the peak output current.
choke load
Yeah I did some thinking as well with the choke load, but I could not find one in the 15-20 ohm range,that can handle at least 4 to 5 amps. Maybe a combination choke load with a resistor, if you can find a choke to suit let me know. I think a choke of this caliber might be kind of huge?🙂
Yeah I did some thinking as well with the choke load, but I could not find one in the 15-20 ohm range,that can handle at least 4 to 5 amps. Maybe a combination choke load with a resistor, if you can find a choke to suit let me know. I think a choke of this caliber might be kind of huge?🙂
I will only be using it from 400hz up so I will not need a verry large choke.
I am thinking of something in the 20 to 50 mh range. 4 lbs of 16 gage wire
on a 1" core 1" long will give me 42mh with a dc resistance ~2 ohms. And
I believe the dc resistance is not a factor here it's the ac resistance.
I am thinking of something in the 20 to 50 mh range. 4 lbs of 16 gage wire
on a 1" core 1" long will give me 42mh with a dc resistance ~2 ohms. And
I believe the dc resistance is not a factor here it's the ac resistance.
A year ago I built a Zen type amp with a 10mh 10@ choke in series with a 15 ohm resistor, the mosfet biased at 1.6@, a total of 50,000uf filtering a slightly beefed up version of Mark Houstons 2SK1058 amp. It sounded so good one of my buddies wanted one, so I made another one.Now I want to take it to the next level by building a more efficient amp with a ccs supply, more voltage and heavier current more of the same sound with more slam and of course less distortion, I've been reading Nelsons reports on these zen amps going back to 1994-ZV9 in 2006. Like many of you on the forum I'm addicted to the minimalist purist approach.
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