To everyone who asked..
All the details and pictures of the amp can be found on page #320. In short, it uses the original GB boards with top-notch components, and built using a KSA100 as design template for wiring, layout and heatsinking. Output devices are 4 pairs MJ21194/MJ21193, voltage rails are a bit low at 31VDC (I used 500VA 25-0-25VA toroids I had at hand).
The 22pF sounded fine, but there was some erratic behaviour at times and the measurements were not consistent. So I changed it to 47 to be safe and everything worked better. Concerning audibility, the amp SOUNDED exactly the same irrespective of these caps' value, and I had them way up to 470pF at a point. I'm sure that with improved PCB layout and grounding 22pF would have been OK.
Pinkmouse, the one I'm currently building with your boards so far promises to be even better (just a pity that the resistor pads are too small to accommodate Holco H4 leads), but since the owner (I agreed to build it on the condition that I do no mechanical work) is in no hurry I don't know long it will be. So far it's going to be
- 2x 1kVA toroids
- 42VDC rails
- 6 pairs MJL4281/4302 output devices/ch
- CLC PSU
- separate PSU for the small-signal stage
- Riken, Holco and PRP resistors, BG electrolytics, SoniCap MKP's
If anyone wants any particular measurements please speak before the end of the week, I'm taking it back home then and have no intention of carrying this beast up the stairs to my office again! The next measurements will be with the next model whenever it's finished.
Pierre
All the details and pictures of the amp can be found on page #320. In short, it uses the original GB boards with top-notch components, and built using a KSA100 as design template for wiring, layout and heatsinking. Output devices are 4 pairs MJ21194/MJ21193, voltage rails are a bit low at 31VDC (I used 500VA 25-0-25VA toroids I had at hand).
The 22pF sounded fine, but there was some erratic behaviour at times and the measurements were not consistent. So I changed it to 47 to be safe and everything worked better. Concerning audibility, the amp SOUNDED exactly the same irrespective of these caps' value, and I had them way up to 470pF at a point. I'm sure that with improved PCB layout and grounding 22pF would have been OK.
Pinkmouse, the one I'm currently building with your boards so far promises to be even better (just a pity that the resistor pads are too small to accommodate Holco H4 leads), but since the owner (I agreed to build it on the condition that I do no mechanical work) is in no hurry I don't know long it will be. So far it's going to be
- 2x 1kVA toroids
- 42VDC rails
- 6 pairs MJL4281/4302 output devices/ch
- CLC PSU
- separate PSU for the small-signal stage
- Riken, Holco and PRP resistors, BG electrolytics, SoniCap MKP's
If anyone wants any particular measurements please speak before the end of the week, I'm taking it back home then and have no intention of carrying this beast up the stairs to my office again! The next measurements will be with the next model whenever it's finished.
Pierre
No worries, send it when you get the time.
I'll be out of town Wednesday to Sunday to explore my decadent side so I wont be able to answer anything untill the end of the week. So if you AndrewT can send me the file then I'll pass everything along for pricing and post the reply when I get back.
OT
I'll be at Sweden rock festival !
I'll be out of town Wednesday to Sunday to explore my decadent side so I wont be able to answer anything untill the end of the week. So if you AndrewT can send me the file then I'll pass everything along for pricing and post the reply when I get back.
OT
I'll be at Sweden rock festival !
earbleadin' 
Norah Jones and such in nice to test the system you build but you have to have som REAL music every once in a while
Norah Jones and such in nice to test the system you build but you have to have som REAL music every once in a while
Hi, I made some asumptions so feel free to correct me if thy are wrong.
AndrewT
Your specials where supposed to be size small.
dr.strangelove3
You wanted 2 Large with no number so that they could be made for both ksa50 and ksa100. Because of this I took the liberty of specifying your order to one KSA-50 and one KSA100.
AndrewT
Your specials where supposed to be size small.
dr.strangelove3
You wanted 2 Large with no number so that they could be made for both ksa50 and ksa100. Because of this I took the liberty of specifying your order to one KSA-50 and one KSA100.
If anyone of you is thinking of output protection relays,
one of the best for peanuts(5V only) =>
www.diyaudio.com/forums/showthread.php?s=&threadid=19657
Need specs? Ask the SDS expert.
one of the best for peanuts(5V only) =>
www.diyaudio.com/forums/showthread.php?s=&threadid=19657
Need specs? Ask the SDS expert.
Attachments
AndrewT
No worries, I just coundn't remember if you stated the size 🙂
I did find it now thou. Post 6564, my misstake.
No worries, I just coundn't remember if you stated the size 🙂
I did find it now thou. Post 6564, my misstake.
Yeah, it really took some work backtracking some pages. Specially since I bookmarked the first "badgepage". 😀
I was in a hurry, thats all
Someone works fast. 🙂
After a 40% discount here are the prices based on forex currencyexchange:
Small badges: 4,5$
Large badges: 12,5$
Shipping worldwide:
Padded envelope is 4$
Recommended is 13$
(not for Ryssen )
Shippingprices are calculated on the basis that envelope and badges weighs under 2000grams. And fit the envelope ofcourse (150x210 mm) 🙂
Edit:
I'll be sending each of you an Email asking if I have your GoAhead since I don't know how often you all check in on this thread
Edit2:
Emailed everyone exept LuckyLyndy, are the prices ok with you.
ALL
Damn, I forgot to ask you to reply with prefered postage, recommended or not. Please do so.
After a 40% discount here are the prices based on forex currencyexchange:
Small badges: 4,5$
Large badges: 12,5$
Shipping worldwide:
Padded envelope is 4$
Recommended is 13$
(not for Ryssen )
Shippingprices are calculated on the basis that envelope and badges weighs under 2000grams. And fit the envelope ofcourse (150x210 mm) 🙂
Edit:
I'll be sending each of you an Email asking if I have your GoAhead since I don't know how often you all check in on this thread
Edit2:
Emailed everyone exept LuckyLyndy, are the prices ok with you.
ALL
Damn, I forgot to ask you to reply with prefered postage, recommended or not. Please do so.
Well, I'm off!
I'll get back to you regarding badges on sunday. Please keep sending the confirmations, prefered postage and so on.
I'll get back to you regarding badges on sunday. Please keep sending the confirmations, prefered postage and so on.
not a beep out of anyone for four days?
Anyway.
Pinkmouse and LuckyLyndy/Mark
Is regular shipping also OK with you guys?
Anyway.
Pinkmouse and LuckyLyndy/Mark
Is regular shipping also OK with you guys?
I don't think I ever saw your mail!
I'll have a search through my spam file, but AFAIK regular postage is fine by me.
I'll have a search through my spam file, but AFAIK regular postage is fine by me.
Making some progress and I'm pretty excited. I think you'll like it😀 . Keep in mind some wiring and the bridge is temporary. I actually gave it power tonight and no smoke! HOORAY!.
The front is cocobola and alu. I've tried hard to make it look like a high end commercial amp. What do you think?
3 pics coming.
The front is cocobola and alu. I've tried hard to make it look like a high end commercial amp. What do you think?
3 pics coming.
