Flodstroem:
What is the response about shipping some of those Avel transformers to the USA office? If you have not received any response, post their email address. Perhaps a larger number of inquiries would prompt some type of response.
Has anybody State side found a source for reasonable transformers for this project?
Two more feet of fresh snow in the Wasatch Mountains, and the ski bums are going into a frenzy of fresh powder.
Utah, the best snow on Earth :0)
Lyndon
What is the response about shipping some of those Avel transformers to the USA office? If you have not received any response, post their email address. Perhaps a larger number of inquiries would prompt some type of response.
Has anybody State side found a source for reasonable transformers for this project?
Two more feet of fresh snow in the Wasatch Mountains, and the ski bums are going into a frenzy of fresh powder.
Utah, the best snow on Earth :0)
Lyndon
Hi all
I'm new here in this forum and I just saw this thread. Unfotunately the thread is already 135pages and I went just fast through it. I'm very interessted and would like to ask u some questions.
1. Is the amplifier already finish and does it work?
2. Is it possible to get the print layout to do the print by myself. I saw that the collectiv ordering for the print is already over🙁 .
3. Are there any big problems to get some of the needed eletronic parts?
Sorry for all those questions. I would also go throught the thread if it's not 135 pages
I'm new here in this forum and I just saw this thread. Unfotunately the thread is already 135pages and I went just fast through it. I'm very interessted and would like to ask u some questions.
1. Is the amplifier already finish and does it work?
2. Is it possible to get the print layout to do the print by myself. I saw that the collectiv ordering for the print is already over🙁 .
3. Are there any big problems to get some of the needed eletronic parts?
Sorry for all those questions. I would also go throught the thread if it's not 135 pages
LuckyLyndy said:
Hi Lyndon. My strategy are as follows: when all members who wants to order this Krell x-former has join in for a GB I would also like to discuss the shipping methods and destinations with Avel, at the same time when I place the order. This could be more effective / beneficial due to I already have a batch to order compared to if I had no order to place. Guess their willingness to please us and help us with freight solutions is far more stronger than if not having placed an order. But I could be wrong about that, but for the moment I have no better ideas. I´ll keep you informed.
Regards 😎
"1. Is the amplifier already finish and does it work?"
Yes of course it works. It was produced by Krell Indistries back in the 1980's and is ocnosdered one of the finest Class A power amps ever manufactured.
"2. Is it possible to get the print layout to do the print by myself. I saw that the collectiv ordering for the print is already over"
I can spare you a set of the gold plated boards so you don't have to make your own.
"3. Are there any big problems to get some of the needed eletronic parts?"
The only hard to get part is the 1N5309 current diode. They are available from Mouser Electronics though. I;m not sure yet if I have any extras.
Hope this answers your questions.
Mark
Yes of course it works. It was produced by Krell Indistries back in the 1980's and is ocnosdered one of the finest Class A power amps ever manufactured.
"2. Is it possible to get the print layout to do the print by myself. I saw that the collectiv ordering for the print is already over"
I can spare you a set of the gold plated boards so you don't have to make your own.
"3. Are there any big problems to get some of the needed eletronic parts?"
The only hard to get part is the 1N5309 current diode. They are available from Mouser Electronics though. I;m not sure yet if I have any extras.
Hope this answers your questions.
Mark
Re: Re: samples
Hi Flodstroem!
I'm intrested in the transformers, one for each channel since I plan on building mono blocks. (I assume that was the original configuration of the transformers anyway.)
I didn't find this group buy under "Market Place" though?
Any link to the manufacturer, and part no, so we can check it out?
Rgds
Flodstroem said:
Hi Flodstroem!
I'm intrested in the transformers, one for each channel since I plan on building mono blocks. (I assume that was the original configuration of the transformers anyway.)
I didn't find this group buy under "Market Place" though?
Any link to the manufacturer, and part no, so we can check it out?
Rgds
@Mark A. Gulbrandsen :
1. Do u have any idea how much such a Krell Clone will approximately cost? (electronic parts, housing, heat sink)
I can spare you a set of the gold plated boards so you don't have to make your own.
=>How much would it cost if u would send me one to Switzerland. Any Idea?
I went through the “how to paper” http://www.diyaudio.com/forums/attachment.php?s=&postid=1072173&stamp=1165225301 and realized that it’s possible to choose from many different electronic parts. On this paper is just the mainboard listed.
- So, in the case I would get the print from u, could You also tell me which components I exactly have to use for the main-board?
- Is there also a print for the powersuplly available? Where are these parts listed?
- Do u also have a print for the powersupply?
For me, the most important thing is to find out if I can get all electronic parts here. The transformer might be also difficult to get, any clues?
I hope I’m not going on ur nerves already with my bloody questions, but it’s pretty hard to get in the theme, cause I didn’t join the thread when it started :-(
1. Do u have any idea how much such a Krell Clone will approximately cost? (electronic parts, housing, heat sink)
I can spare you a set of the gold plated boards so you don't have to make your own.
=>How much would it cost if u would send me one to Switzerland. Any Idea?
I went through the “how to paper” http://www.diyaudio.com/forums/attachment.php?s=&postid=1072173&stamp=1165225301 and realized that it’s possible to choose from many different electronic parts. On this paper is just the mainboard listed.
- So, in the case I would get the print from u, could You also tell me which components I exactly have to use for the main-board?
- Is there also a print for the powersuplly available? Where are these parts listed?
- Do u also have a print for the powersupply?
For me, the most important thing is to find out if I can get all electronic parts here. The transformer might be also difficult to get, any clues?
I hope I’m not going on ur nerves already with my bloody questions, but it’s pretty hard to get in the theme, cause I didn’t join the thread when it started :-(
OMB,
read the KSA100MKII WIKI=> HERE
Should be less tiring than 135 pages.
You can read on the KSA100MKII WIKI that a set of boards to Die Schweiz will cost around $50.-
For boards of this design and production quality, 50 bucks for a stereo set is totally ridiculous.
Building costs depend on your resourcefullness : SFR750 to SFR2000.
The KSA100MKII is a very chunky and serious powerfull amplifier.
Also had a serious price tag, Euro price was around SFR 10,000.- in the beginning of 1986.
Don't expect a Class A beast to come really cheap, but today is the cheapest and best time ever to build such a big hunk.
You can locate components at Ebay, find them here, or order some affordable through the web.
35Vac to 40Vac toroidal transformers in the 750 to 1KVA should not be hard to find on the internet.
Some of the KSA100MKII builders can help you with parts, if necessary.
The group buy KSA100MKII boards are way superior to the original ones, as are many of the current components.
In terms of component choices, the sky is the limit.
In your case, i'd stick to the basic BOM and/or post specific questions related to component choices.
You don't need a powersupply board if you keep to the basic setup.
The main bulk of general KSA100MKII info is HERE
read the KSA100MKII WIKI=> HERE
Should be less tiring than 135 pages.
You can read on the KSA100MKII WIKI that a set of boards to Die Schweiz will cost around $50.-
For boards of this design and production quality, 50 bucks for a stereo set is totally ridiculous.
Building costs depend on your resourcefullness : SFR750 to SFR2000.
The KSA100MKII is a very chunky and serious powerfull amplifier.
Also had a serious price tag, Euro price was around SFR 10,000.- in the beginning of 1986.
Don't expect a Class A beast to come really cheap, but today is the cheapest and best time ever to build such a big hunk.
You can locate components at Ebay, find them here, or order some affordable through the web.
35Vac to 40Vac toroidal transformers in the 750 to 1KVA should not be hard to find on the internet.
Some of the KSA100MKII builders can help you with parts, if necessary.
The group buy KSA100MKII boards are way superior to the original ones, as are many of the current components.
In terms of component choices, the sky is the limit.
In your case, i'd stick to the basic BOM and/or post specific questions related to component choices.
You don't need a powersupply board if you keep to the basic setup.
The main bulk of general KSA100MKII info is HERE
A sensible component choice would be the following IMO:
0.25/0.5W resistors: Dale, check at Welborne Labs
5W resistors: Mills or any other type that's preferably non-inductive.
Diodes/Zeners: any competent place, no specific "quality"
Transitors: ONSemi should have most of what you need unless you want to use Toshiba predrivers. Finding local agents stocking ONSemi parts shouldn't be difficult. For the LTP try to stick to the 2SA/2SC ones specified, they're generally easy to get and cheap. Farnell has them as a last resort. Watch out for fakes!
Capacitors: For the electrolytics anything you can find preferably with a pronouncable name. Panasonic FC and Rubycon YXF are good low-cost options. The feedback caps may benefit from Elna Cerafines, which can be found at Welborne Labs. Popular choices for the film types are Wima or Evox-Rifa. Farnell is also a last resort if you can't find them. Same goes for silver mica.
Parts Connexion is a good choice for pretty much all the resistors and capacitors with prices varying from reasonable ($0.6/resistor) to insane ($7/resistor). They also stock silver mica, polystyrene and Black Gate, and Mills/Kiwame 5W resistors.
For the 1N5309 you may have some trouble, contact Mark if you get stuck.
Important thing is to check the dimensions of the component you buy with the board. Make a printout of the board and ensure the component you want will fit, or it will look rather unprofessional. Since boutique components are usually larger than their cheaper counterparts this happens often.
Hope this helps!
0.25/0.5W resistors: Dale, check at Welborne Labs
5W resistors: Mills or any other type that's preferably non-inductive.
Diodes/Zeners: any competent place, no specific "quality"
Transitors: ONSemi should have most of what you need unless you want to use Toshiba predrivers. Finding local agents stocking ONSemi parts shouldn't be difficult. For the LTP try to stick to the 2SA/2SC ones specified, they're generally easy to get and cheap. Farnell has them as a last resort. Watch out for fakes!
Capacitors: For the electrolytics anything you can find preferably with a pronouncable name. Panasonic FC and Rubycon YXF are good low-cost options. The feedback caps may benefit from Elna Cerafines, which can be found at Welborne Labs. Popular choices for the film types are Wima or Evox-Rifa. Farnell is also a last resort if you can't find them. Same goes for silver mica.
Parts Connexion is a good choice for pretty much all the resistors and capacitors with prices varying from reasonable ($0.6/resistor) to insane ($7/resistor). They also stock silver mica, polystyrene and Black Gate, and Mills/Kiwame 5W resistors.
For the 1N5309 you may have some trouble, contact Mark if you get stuck.
Important thing is to check the dimensions of the component you buy with the board. Make a printout of the board and ensure the component you want will fit, or it will look rather unprofessional. Since boutique components are usually larger than their cheaper counterparts this happens often.
Hope this helps!
To those considering to buy the original mains transformer the GB will soon start
This is how the mains looks like:
http://home.ca.inter.net/~lloyd.maclean/Krell/Krell.htm
You will receive a Krell original transformer and it will be the same as in the pictures
VA ratings will be in the magnitude of ca 1 kVA and you should use one transformer for each channel, eg. two transformers for a stereo amp.
There will also be an option to build a regulated power supply for the LTP and driver stage from this transformer due to an added extra winding for the purpose (2 x 65-70V @ 0.5A). As an example you could build a regulated power supply like: ±39V (10-20mA) for the LTP and ± 65V (@ 350mA maximum) for the driver stage.
regards 😎
This is how the mains looks like:
http://home.ca.inter.net/~lloyd.maclean/Krell/Krell.htm
You will receive a Krell original transformer and it will be the same as in the pictures
VA ratings will be in the magnitude of ca 1 kVA and you should use one transformer for each channel, eg. two transformers for a stereo amp.
There will also be an option to build a regulated power supply for the LTP and driver stage from this transformer due to an added extra winding for the purpose (2 x 65-70V @ 0.5A). As an example you could build a regulated power supply like: ±39V (10-20mA) for the LTP and ± 65V (@ 350mA maximum) for the driver stage.
regards 😎
The original KSA100's transformers
Sorry if this has been mentioned before here, but I can't seem to find the info.
Does anyone know what brand and spec the original transformers were?
Sorry if this has been mentioned before here, but I can't seem to find the info.
Does anyone know what brand and spec the original transformers were?
Re: The original KSA100's transformers
Hi Patrik.
First supplier of the main transformer to Krell was Avel Lindberg.
Avel was a supplier to Krell up to 1982, I think it was, then Krell switched to another supplier that no longer is in business, but Avel is. I have a contakt at Avel and I have discussed different Krell models with him. I have supplied him with as much information of the KSA100mk-II (and thank you PWatts for that valuable info.) so he was able to verify the KSA100 transformer at their file library. But the specs is not a common public available information, it is "Classified" and belongs to the Krell company only. He said that Avel could start a small production run for DiyAudio Forum members if we wanted, but the price is still in the Krell "category", but who cares, you will receive an original unit that will guarantee you the same specs as the original Amp. and thats the whole point, isnt it?
In the KSA100 Wiki site there is some links regarding the transformer issue in this tread, have you seen them?
Regards 😎
Patrik Floding said:
Hi Patrik.
First supplier of the main transformer to Krell was Avel Lindberg.
Avel was a supplier to Krell up to 1982, I think it was, then Krell switched to another supplier that no longer is in business, but Avel is. I have a contakt at Avel and I have discussed different Krell models with him. I have supplied him with as much information of the KSA100mk-II (and thank you PWatts for that valuable info.) so he was able to verify the KSA100 transformer at their file library. But the specs is not a common public available information, it is "Classified" and belongs to the Krell company only. He said that Avel could start a small production run for DiyAudio Forum members if we wanted, but the price is still in the Krell "category", but who cares, you will receive an original unit that will guarantee you the same specs as the original Amp. and thats the whole point, isnt it?
In the KSA100 Wiki site there is some links regarding the transformer issue in this tread, have you seen them?
Regards 😎
Re: Re: The original KSA100's transformers
Thanks for the reply!
What sort of price for the Lindberg's are we expecting?
Would it be cheaper to go for a standard spec transformer, without the extra winding (I somehow doubt I'll get time to implement separate regulated power for the driver stage -especially if the amp sounds good from the start).
Yes, I read up on the thread referenced at the wiki. Just failed to find that brand name.
Rgds
Flodstroem said:
Thanks for the reply!
What sort of price for the Lindberg's are we expecting?
Would it be cheaper to go for a standard spec transformer, without the extra winding (I somehow doubt I'll get time to implement separate regulated power for the driver stage -especially if the amp sounds good from the start).
Yes, I read up on the thread referenced at the wiki. Just failed to find that brand name.
Rgds
Re: Re: Re: The original KSA100's transformers
Pricing for the original is the same without the extra winding due to there is one original winding that we can not use (relay winding!!??) and changing its voltage and amps ratings to fit our purposes does not change the original price.
Regarding pricing: Avel has offered me a price level in the range for 6-29 pcs at £ (GBP) 145.00 each which will be £ 290 for a stereo amp.
Now, Avel has confirmed that the differences between the KSA 100 and the KSA100mk-II models is that the transformer for the KSA100mk-II is a "Super quiet" transformer due to mechanical hum and noise and also a "Super quiet" transformer due to electrical shielding and that kind of issues.
Transformer dimensions will be as follows: Diam. 6,75" x 5" heights
Regards 😎
Patrik Floding said:
Pricing for the original is the same without the extra winding due to there is one original winding that we can not use (relay winding!!??) and changing its voltage and amps ratings to fit our purposes does not change the original price.
Regarding pricing: Avel has offered me a price level in the range for 6-29 pcs at £ (GBP) 145.00 each which will be £ 290 for a stereo amp.
Now, Avel has confirmed that the differences between the KSA 100 and the KSA100mk-II models is that the transformer for the KSA100mk-II is a "Super quiet" transformer due to mechanical hum and noise and also a "Super quiet" transformer due to electrical shielding and that kind of issues.
Transformer dimensions will be as follows: Diam. 6,75" x 5" heights
Regards 😎
Don't loose hope GEWA... I sent your boards out with the first batch and that was well over a month ago. I will send you another set this Saturday.... Hang in there my friend....you will
get yours.
Mark
get yours.
Mark
Hi all
THX for all the information u gave me about the parts. I'm just still considering if it won't be to challenging for me to build that amp. I mean it's not just soldering 😉 !
Does one of ur guys already made the mainprint? Would love to see a picture ones, just that i can imagine what i would have to expect. THX
THX for all the information u gave me about the parts. I'm just still considering if it won't be to challenging for me to build that amp. I mean it's not just soldering 😉 !
Does one of ur guys already made the mainprint? Would love to see a picture ones, just that i can imagine what i would have to expect. THX
Re: Re: Re: Re: The original KSA100's transformers
Thanks for the info!
I have to admit that that price point is a bit excessive for me. I wonder if more normal transformers might not work equally well.
Thanks for the info!
I have to admit that that price point is a bit excessive for me. I wonder if more normal transformers might not work equally well.
Flodstroem said:
Hi Mark,
I'm interested in a stereo set of the PCB (i.e. 2 PCBs).
Please email me if you could spare a few.
Thanks.
I'm interested in a stereo set of the PCB (i.e. 2 PCBs).
Please email me if you could spare a few.
Thanks.
Hi,
35V+35V and 40V+40V transformer are easy to source in 800VA to 1000VA. But getting 37Vac is very unlikely.
If one were to accept the slightly lower power from 35Vac and do without the extra windings for regulated front end and the relay then these can be obtained for about 40% of the price of the custom Avel.
It is relatively easy to add on just a pair of 10Vac to 12Vac windings and stack them over the main rectifier feeds to generate the extra regulation feeds. Not quite as good as separate high voltage windings but can be made to perform just as well.
35V+35V and 40V+40V transformer are easy to source in 800VA to 1000VA. But getting 37Vac is very unlikely.
If one were to accept the slightly lower power from 35Vac and do without the extra windings for regulated front end and the relay then these can be obtained for about 40% of the price of the custom Avel.
It is relatively easy to add on just a pair of 10Vac to 12Vac windings and stack them over the main rectifier feeds to generate the extra regulation feeds. Not quite as good as separate high voltage windings but can be made to perform just as well.