still4given said:
Terry- the thought of you sitting idle and actually having time to listen to your krell is causing me distress. I can't have it. If you suspect you will need some boards-- why don't you let me send you a pair of aleph X boards, if you agree to help me out with my version (if I need it....yeah right of course I will) they will be there via fedex asap. email me offline. I have a set extra. Ok its not a krell but you already did that.
Re: Trannies
Good to hear it. He was always prompt with me. I am buying the 28-0-28 500vA trannies. I'm hoping I can use them as-is.
When I read that thread it seems to me that he was unable to get true class A bias with that setup. Maybe I missed something. I'm not trying to be a nay-sayer. I'm hoping it will work. I would love to not use a fan but I also don't want a 2' tall amp. If you split the heatsink in half, are you planning on mounting the +rail outputs on one and the -rail outputs on the other? If there is one thing I'm learning is that heat dissapation is a vital part of making power. If you can't get rid of the heat, you can't have the current. Seems Class A is all about current. I know My Krell clone didn't begin to sound right until I got the bias up where it belongs. It's a whole different amp once you achieve that.
Blessings, Terry
LuckyLyndy said:
Good to hear it. He was always prompt with me. I am buying the 28-0-28 500vA trannies. I'm hoping I can use them as-is.
When I read that thread it seems to me that he was unable to get true class A bias with that setup. Maybe I missed something. I'm not trying to be a nay-sayer. I'm hoping it will work. I would love to not use a fan but I also don't want a 2' tall amp. If you split the heatsink in half, are you planning on mounting the +rail outputs on one and the -rail outputs on the other? If there is one thing I'm learning is that heat dissapation is a vital part of making power. If you can't get rid of the heat, you can't have the current. Seems Class A is all about current. I know My Krell clone didn't begin to sound right until I got the bias up where it belongs. It's a whole different amp once you achieve that.
Blessings, Terry
Re: Re: Trannies
That is exactly correct. My hs are 16" long x 8" wide x 2" thick.
I dropped them off this morning to be cut in half length wise so I will have 8 x 8 inch squares 2 " thick.
I will then put 2 squares side by side to make a side wall of the chassis that is 16" long x 8 " tall but with the fins VERTICALLY oriented.
I would REALLY like to see if a single 8" section would be good for 1 channel instead of having to go 16" back on a chassis.
still4given said:
That is exactly correct. My hs are 16" long x 8" wide x 2" thick.
I dropped them off this morning to be cut in half length wise so I will have 8 x 8 inch squares 2 " thick.
I will then put 2 squares side by side to make a side wall of the chassis that is 16" long x 8 " tall but with the fins VERTICALLY oriented.
I would REALLY like to see if a single 8" section would be good for 1 channel instead of having to go 16" back on a chassis.
Howdy rabstg,
Rod Elliott's heatsink calculator computes about .4381 deg C/Watt for the size you spec'd. Not sure if this info helps you much. Try it for yourself. http://sound.westhost.com//download.htm#hsink
Regards,
Elvin
Rod Elliott's heatsink calculator computes about .4381 deg C/Watt for the size you spec'd. Not sure if this info helps you much. Try it for yourself. http://sound.westhost.com//download.htm#hsink
Regards,
Elvin
Troy -
plugging the numbers into this tool, it looks like you would be at (ambient+rise) 55C when using both sinks per channel with natural convection.
~Brad
plugging the numbers into this tool, it looks like you would be at (ambient+rise) 55C when using both sinks per channel with natural convection.
~Brad
Mark,
Just got the Pinky boards, they are awesome, very nice.... thanks!
but I thought they were not pink enough. 😉
Just got the Pinky boards, they are awesome, very nice.... thanks!
but I thought they were not pink enough. 😉
I got my boards! Just as lovely as the Leach VI boards. Looking forward to putting them together.
Thanks Mark,
Terry
Thanks Mark,
Terry
power supply
I'm about to start this project and want to put together the power supply first. I have decided to go dual mono all the way back to the cord. I have a couple of questions:
1. I will probably go with the Avel toroidal transformers which are very reasonably priced and are stocked in 25-0-25 and 30-0-30. It seems like the actual spec is somewhere in between. Is this a problem and if not which one should I go for? For a mono amp, would you go for 330VA or 500VA?
2. Can anyone give a list of the components and/or schematic used in their PS?
Thanks everyone
Philip
I'm about to start this project and want to put together the power supply first. I have decided to go dual mono all the way back to the cord. I have a couple of questions:
1. I will probably go with the Avel toroidal transformers which are very reasonably priced and are stocked in 25-0-25 and 30-0-30. It seems like the actual spec is somewhere in between. Is this a problem and if not which one should I go for? For a mono amp, would you go for 330VA or 500VA?
2. Can anyone give a list of the components and/or schematic used in their PS?
Thanks everyone
Philip
Philip-
You can go with the 500VA 25x2 transformer for a Stereo amp, or a pair of the 330VA is PLENTY for dual mono.
As for caps, Steve @ Apex.jr has some 68K screw terminal caps for 5.95 each. You can get 4 of those and parallel 2 per rail for a Stereo amp or have just 1 each per rail on each mono amp.
EDIT:
All-
I am "thinking" of mono amps but don't think the 8" tall sections of heat sink will carry a channel.
What is the expected disapation for 25 volt secondaries?
You can go with the 500VA 25x2 transformer for a Stereo amp, or a pair of the 330VA is PLENTY for dual mono.
As for caps, Steve @ Apex.jr has some 68K screw terminal caps for 5.95 each. You can get 4 of those and parallel 2 per rail for a Stereo amp or have just 1 each per rail on each mono amp.
EDIT:
All-
I am "thinking" of mono amps but don't think the 8" tall sections of heat sink will carry a channel.
What is the expected disapation for 25 volt secondaries?
Attachments
Howdy philiprst,
Mr. Veselinovic has an exaustive explaination of what you want to know at this link under the category Designing Your Own Power Supply. Several iterations suitable for your project with schematics and good practical advice.
http://www.zero-distortion.com/start.htm
Regards,
Elvin
Mr. Veselinovic has an exaustive explaination of what you want to know at this link under the category Designing Your Own Power Supply. Several iterations suitable for your project with schematics and good practical advice.
http://www.zero-distortion.com/start.htm
Regards,
Elvin
AndrewT said:
Hi Andrew,
That's cool. Now we can see of all of your ideas are going to work in real practice. Please keep us updated as you go along.
Blessings, Terry
Hi Still4given,
thanks for the support.
I work a LOT slower than you and my KSA Klone comes after the horn sub comes after Leach clone comes after the Sugdens comes after more house self-building.
You could have a long wait. I just did not want to miss the chance for the boards while they were available.
thanks for the support.
I work a LOT slower than you and my KSA Klone comes after the horn sub comes after Leach clone comes after the Sugdens comes after more house self-building.
You could have a long wait. I just did not want to miss the chance for the boards while they were available.
AndrewT said:
Hi Andrew,
Do you HAVE to keep all your ducks in a row? Come on live a little. 😀
Blessings, Terry
Late comer here
I've gone back in the thread about as far as my patience will allow, but seem to be missing the essentials: whom do I contact for PCBs and whom do I contact for a parts kit? Could someone please amend the WIKI to include this info? Thanks in advance gentlemen, this one looks like a winner!
Niles
I've gone back in the thread about as far as my patience will allow, but seem to be missing the essentials: whom do I contact for PCBs and whom do I contact for a parts kit? Could someone please amend the WIKI to include this info? Thanks in advance gentlemen, this one looks like a winner!
Niles
Mark is PCB's(sounds an awful lot like PCP!) and I am parts.
My posts on parts:
http://www.diyaudio.com/forums/showthread.php?postid=721811#post721811
http://www.diyaudio.com/forums/showthread.php?postid=722085#post722085
My posts on parts:
http://www.diyaudio.com/forums/showthread.php?postid=721811#post721811
http://www.diyaudio.com/forums/showthread.php?postid=722085#post722085
Thanks for the reply RABSTG.
One more if you please, just so all the info is condensed here:
It appears that the kit price is per-channel, e.g., $31x2 for a stereo amplifier, plus shipping?
And, it appears that the kit is complete for stuffing the main boards and biasing the output transistors, but does not include the output transistors or power supply components such as trannies, filter caps, recifiers etc. Is this correct?
One more if you please, just so all the info is condensed here:
It appears that the kit price is per-channel, e.g., $31x2 for a stereo amplifier, plus shipping?
And, it appears that the kit is complete for stuffing the main boards and biasing the output transistors, but does not include the output transistors or power supply components such as trannies, filter caps, recifiers etc. Is this correct?
That is exactly correct.
I will supply the parts for the main and driver brds only because there is a division of opinion on output devices.
The resistors with be Dales, which are the minimum audiophile grade resistors to put in this caliber amp, and the other parts were spec'ed by the brd designers and agreed upon by the members in this thread.
I'm out of town for tonight and tomorrow. I will return Sunday and make the parts order Monday.
As it appears now we have payment for 25-30 channels..
I will supply the parts for the main and driver brds only because there is a division of opinion on output devices.
The resistors with be Dales, which are the minimum audiophile grade resistors to put in this caliber amp, and the other parts were spec'ed by the brd designers and agreed upon by the members in this thread.
I'm out of town for tonight and tomorrow. I will return Sunday and make the parts order Monday.
As it appears now we have payment for 25-30 channels..