But how sounds this, the working hybride with 6J51P and ECC99 plus mosfets, penthode is in triode mode with mosfet gyrator, ECC99 is dc coupled tot mosfets...
I now maybe you can,t listen because youtube blocks music for 98 procent because of rights there more who can be listen but is triode voltage preamp..
http://www.youtube.com/watch?v=-U-EFHi2epk
I now maybe you can,t listen because youtube blocks music for 98 procent because of rights there more who can be listen but is triode voltage preamp..
http://www.youtube.com/watch?v=-U-EFHi2epk
Yes it is blocked in my country unfortunately, though I'm not sure how I'm meant to hear the sound quality through streamed video and computer audio!
Thanks for the info on mosfet cascodes. It has verified my suspicion about their use in typical audio applications. BJTs may be another story.
Thanks for the info on mosfet cascodes. It has verified my suspicion about their use in typical audio applications. BJTs may be another story.
these link proberly works, but video is not so good.
penthode input hybrid music quality test video by kees50 - Photobucket
I now pc and youtube compress things, please use a headset or good boxes to listen.
I have not find yet a place to host wav so someone can download it to listen.
it gives som impression of sound from this hybride.
regards
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No kidding! The Photobucket file is monophonic, so the typical comments about "sound stage" and imaging are meaningless. The frequency response drops to zero well before 11025 Hz, and what's worse there is aliasing above that around 13 kHz to 14 kHz.
do you have a better place? idea behind is to get some idea, I agree that it wil kill a lot of detail and warmth.
If you send it to me, I'll host it on my server. Just send me a PM and I'll give you an email address - or maybe just a login so you can upload it directly to the server (you have a Mac?)
HI
thanks, a good idea but is also mediafire a good idea? a cloud way of hosting.
I make a new good audio file, because now I can use the best quality cd.
Maybe you now a good one, I had hdcd downloaded but all are terrible damaged with flac compressiong and don,t work anymore, buy a cd in hdcd is a problem here, not much.
I send PM later on.
thanks
Use whatever hosting service allows you to control the audio file format, as opposed to one that will recode.
I have no idea what you are talking about here. FLAC does not damage audio files unless you're using it wrong somehow. I think the real challenge is to first obtain the full HDCD quality - i.e. better than 16/44k1. Once you have the full quality audio, FLAC should easily be able to compress the file without any damage. I regularly make multichannel 24-bit audio recordings and archive everything in 24-bit FLAC, at 48 kHz, 96 kHz, and 192 kHz, without any damage.
Yes you are right, I did something wrong, with adobe audicy I had to set of something what put something extra in wav, and I burn now with mediaplayer with everything off, now it works, I did use adobe because the music was in one piece I was not enable to switch to other songs, it was one whole flac file, so I have cut it in adobe. now it works, I think but led on cd player is on for hdcd and the first time it did go on and off al te time.
Oke try this links.
Free Cloud Storage - MediaFire
you can download 24 bit audio files recorded trough output hybdride output 10 watt.
sometimes you hear a little small crackle that is because of a faulty tube socket.
nicejazz.wav is a normal audiophile disk, the others are hdcd audiophiles.
Free Cloud Storage - MediaFire
you can download 24 bit audio files recorded trough output hybdride output 10 watt.
sometimes you hear a little small crackle that is because of a faulty tube socket.
nicejazz.wav is a normal audiophile disk, the others are hdcd audiophiles.
Hi Greg
I have play some around to simplify the allfet amp, and came out with a current feedbacked one with single ended cascode vas.
it simulates wonderfull, if this is true wat I get then maybe this one will sound very good, it is current feedback and big bandwith, I have try differend mosfets in vas, the zvn4424 is the best, but maybe just to small, change one in the vas driver can however with some more distortion with a irf 9610, as I escpected capacitance in amps is very important, so cascode is a way to get transients good.
in picture the simulations, one in 100Khz and one in 1 Khz, and the bandwith test, it has no correntions yet, this is only when build it to keep possible oscillations away.
And now I go work in the vestibles garden, summer comes.
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Hi Kees,
I have already built this design months ago and it sounds very good indeed! See here:
http://www.diyaudio.com/forums/solid-state/186650-jfet-input-mosfet-vas-lateral-output-perfect.html
Hugh is offering boards in the aksa forum. Ultimately I decided it sounded better without cascodes though.
I have already built this design months ago and it sounds very good indeed! See here:
http://www.diyaudio.com/forums/solid-state/186650-jfet-input-mosfet-vas-lateral-output-perfect.html
Hugh is offering boards in the aksa forum. Ultimately I decided it sounded better without cascodes though.
Do you have build it without cascodes? I have also seen that with multisim and the zvn and zvp mosfet the distortion is very very low, maybe de models of this mosfets are not correct to ideal,, in mine I have 0.017 procent 100 Khz 100 watt, and zero distortion 100 watt with 1 Khz, cascodes are clean and avoid compression what give a more relaxing sound, called easy.
do read this why cascodes work so good, I now it is personally, thats why there a so much different amps, and thats good.
Momentum I am busy with a hybride dc coupled mosfet amp with tube preamp and drive.
I will do try it soon, because i want to hear it also.
Oke a question I can not get cheap here the parts like zvn 4424 and such, in the amp you have to replace the vas cascode mosfet for a irf9610 type to get more juice but more distortion, and so I think that simulation has to be taken with some distance..
I can order parts but the shipping is 27 euro, for 10 euro parts, so I have to spare a list of parts and go above 75 euro for free shipping, or a chinese supplier who is most not trustable.
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Oke a small correction to the vas cascode, now the upper mosfet can be a small one and de cascode mosfet itslefs takes the most and give juicy drive to mosfet gates. now you can use a lot more upper mosfets for trying how it sounds. I think this will sound good it has current feedback, the offset implementing is not done yet, but everyone now how so it is not a issue, best is a opamp for this in a current feedback amp, if it is current feedback, hmm yes because it feedback to source, I am not shure here, oke, someone else now that why we here for.
distortion is very good, 0.00000 but take it with a egg..
and with 100 khz, 0.013.
distortion is very good, 0.00000 but take it with a egg..
and with 100 khz, 0.013.
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Kees,
I haven't looked at your circuit in the utmost detail but the theory looks sound enough and it should work ok. I would consider dropping the direct coupling in the feedback path and running a feedback shunt cap. This will let you set the DC offset with a simple voltage reference at the gate of the input fet, such as a string of LEDs. This worked for fetzilla at least. The use of a fet input and vas, and lateral fet output gave fetzilla a very stable bias and offset with no servo needed. However this was without cascodes, so I'm not sure if your experience will be different.
If you need parts, you could try digikey. They deliver nearly anywhere and stock most parts at good prices and in small quantities.
I haven't looked at your circuit in the utmost detail but the theory looks sound enough and it should work ok. I would consider dropping the direct coupling in the feedback path and running a feedback shunt cap. This will let you set the DC offset with a simple voltage reference at the gate of the input fet, such as a string of LEDs. This worked for fetzilla at least. The use of a fet input and vas, and lateral fet output gave fetzilla a very stable bias and offset with no servo needed. However this was without cascodes, so I'm not sure if your experience will be different.
If you need parts, you could try digikey. They deliver nearly anywhere and stock most parts at good prices and in small quantities.
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