OK, I keep seeing stuff from kitparts on EBay. Has anyone tried one of their "modified" PCBs or kits? They look like "replicas" of famous amps and preamps. Are they just knock-offs? For the price would we burn in hell for trying them??
From an easy to make standpoint, it seems interesting, they show schematics and pcbs, and you can get an assembled pcb if you wish. Not being familiar with tubes it seems like an easy and cheap way to go....to get something that works, not necessarily something original.
thoughts?
From an easy to make standpoint, it seems interesting, they show schematics and pcbs, and you can get an assembled pcb if you wish. Not being familiar with tubes it seems like an easy and cheap way to go....to get something that works, not necessarily something original.
thoughts?
I hadn't seen that website... very intriguing... I am curious to know what others think. I personally like the idea of a PCB, as I feel very lazy about DIY these days. I don't want to be creative with layouts anymore- just solder the stuff on there.
Anyone yet?
Anyone try this yet?
Kitparts Click "high end audio"
Ebay Store
Looks like they have cases and other interesting items as well.
Roland Accuphase, Marantz amps, CAT preamps, etc..
Anyone try this yet?
Kitparts Click "high end audio"
Ebay Store
Looks like they have cases and other interesting items as well.
Roland Accuphase, Marantz amps, CAT preamps, etc..
Several items on his site are similar to what diyaudio.biz sells. I purchased an enclosure and remote relay volume control from them.
I purchased from Kitparts
I made the mistake of purchasing several boards (line stage) from them. The first board was supposed to be the (blue Jadis) and they sent me the green board. Rather than go thru the trouble of sending it back I kept the green board and got the blue board for an extra 15 dollars.
The workmanship of the boards is good. They are not even close to being a clone as they advertise. The circuit sounds like **** in stock form. It wasn't until I totally modified the board to be an exact copy of the Jadis that it sounded good. Still have some hum issues to be worked out. Note this is the (Blue) Jadis board.
Frank was kind enough to find a copy of the "true Jadis" and post it. I copied this circuit complete with Frank's changes.
Sonically it is quite good now. It has good bass, mids and highs.
I have the (green Jadis) stuffed and ready to play with but haven't done so yet.
I made the mistake of purchasing several boards (line stage) from them. The first board was supposed to be the (blue Jadis) and they sent me the green board. Rather than go thru the trouble of sending it back I kept the green board and got the blue board for an extra 15 dollars.
The workmanship of the boards is good. They are not even close to being a clone as they advertise. The circuit sounds like **** in stock form. It wasn't until I totally modified the board to be an exact copy of the Jadis that it sounded good. Still have some hum issues to be worked out. Note this is the (Blue) Jadis board.
Frank was kind enough to find a copy of the "true Jadis" and post it. I copied this circuit complete with Frank's changes.
Sonically it is quite good now. It has good bass, mids and highs.
I have the (green Jadis) stuffed and ready to play with but haven't done so yet.
Hi,
Could you direct me to the information posted by Frank. By the way, have you ever used the Red Jadis boards? The mono boards?
Thanks, Nick
Could you direct me to the information posted by Frank. By the way, have you ever used the Red Jadis boards? The mono boards?
Thanks, Nick
burnedfingers said:
Hi Nick,
I believe this is what you are looking for.
Never tried the "red" boards. I do have the "blue" boards and they are two separate sections. I have the "green" boards also.
I am not real happy with either boards. If you have the "red" boards I hope you have better luck than I did..
I believe this is what you are looking for.
Never tried the "red" boards. I do have the "blue" boards and they are two separate sections. I have the "green" boards also.
I am not real happy with either boards. If you have the "red" boards I hope you have better luck than I did..
Attachments
I suspect that that means that you never got rid of the hum? Sheesh! It sounded like you worked pretty hard on getting rid of it. It also sounds like I should save my money. Perhaps finish that Marantz 9 clone project. Actually, it's not really a clone. I actually bought the turret board from Vac when they were making the reissues and had the output transformers wound for my by Dennis Hoyer. Unfortunately, I think this stuff is going on ebay, because I don't feel motivated to build this amp anymore.
Thanks, Nick
Thanks, Nick
burnedfingers said:
Nick,
Unfortunately I don't feel motivated to do much more with these projects at this time. I suspect that after I get thru doing my wifes honeydew list I may take a crack at them again.
I wouldn't ebay your project yet. You may feel different in the future.
Maybe these overseas boards suffer from my inability to bring out the best in them or maybe they might be better served with a regulated power supply.
Joe
Unfortunately I don't feel motivated to do much more with these projects at this time. I suspect that after I get thru doing my wifes honeydew list I may take a crack at them again.
I wouldn't ebay your project yet. You may feel different in the future.
Maybe these overseas boards suffer from my inability to bring out the best in them or maybe they might be better served with a regulated power supply.
Joe
Perhaps if I bought purchased one of there completed boards, I'd have better luck. By the way, is it possible that the hum is from a leaky cap, bad resistor..... faulty component or something like that?
Thanks, Nick
Thanks, Nick
burnedfingers said:
Perhaps if I bought purchased one of their completed boards, I'd have better luck. By the way, is it possible that the hum is from a leaky cap, bad resistor..... faulty component or something like that?
Thanks, Nick
P.S. I reposted, because I apparently don't know how to spell the word "their"
Thanks, Nick
P.S. I reposted, because I apparently don't know how to spell the word "their"
burnedfingers said:
Hum (60Hz) and buzz (120Hz/180Hz) can be caused by a variety of things, including but not limited to poor filtration of the supplies, flux leakage from power transformers and often by internal ground loops.
Check to make sure you don't have multiple paths from the board to chassis (e.g.ground plane to standoffs?) and inputs/outputs to board and chassis. All rca jacks should be insulated from the chassis and their grounds brought directly to a common grounding point - alternately you can bus them together at the jacks and bring one ground connection back to your common ground.
Depending on how the filament traces are routed if you are using ac to heat filaments you may have electrostatic and possibly magnetic coupling to adjoining circuitry.
IMHO component quality is really important and I spent a long time figuring out that as an EE I didn't understand why some parts sound good and others don't.. Some surplus CDE and TRW caps sound reasonably good, but you might want to have a look at the REL PPFX, not expensive and relatively free of dielectric effects.
The board layout looks reasonably ok to my eye.
Kevin
Edited to add an additional thought and clarify a remark..
Check to make sure you don't have multiple paths from the board to chassis (e.g.ground plane to standoffs?) and inputs/outputs to board and chassis. All rca jacks should be insulated from the chassis and their grounds brought directly to a common grounding point - alternately you can bus them together at the jacks and bring one ground connection back to your common ground.
Depending on how the filament traces are routed if you are using ac to heat filaments you may have electrostatic and possibly magnetic coupling to adjoining circuitry.
IMHO component quality is really important and I spent a long time figuring out that as an EE I didn't understand why some parts sound good and others don't.. Some surplus CDE and TRW caps sound reasonably good, but you might want to have a look at the REL PPFX, not expensive and relatively free of dielectric effects.
The board layout looks reasonably ok to my eye.
Kevin
Edited to add an additional thought and clarify a remark..
Quote:
Perhaps if I bought purchased one of their completed boards, I'd have better luck. By the way, is it possible that the hum is from a leaky cap, bad resistor..... faulty component or something like that?
I used ALL new parts. To be honest I suspect a faulty lay out.
One thing to keep in mind is these boards are no where close to the originals that they are supposed to be cloned from.
You could probably do a search and find a schematic for a 6sn7 or 12b4 or something along that line that will blow the Jap boards to the curb. If not I have the green board Jadis clone all stuffed up if you want to buy a finished board. Just add power supply and volume control.
Perhaps if I bought purchased one of their completed boards, I'd have better luck. By the way, is it possible that the hum is from a leaky cap, bad resistor..... faulty component or something like that?
I used ALL new parts. To be honest I suspect a faulty lay out.
One thing to keep in mind is these boards are no where close to the originals that they are supposed to be cloned from.
You could probably do a search and find a schematic for a 6sn7 or 12b4 or something along that line that will blow the Jap boards to the curb. If not I have the green board Jadis clone all stuffed up if you want to buy a finished board. Just add power supply and volume control.
Hi Gavin,
That would be great, but I believe part of the problem is whether the schematic or the PCB are even close to the real design of the Jadis. Do you have an original Schematic?
Thanks, Nick
That would be great, but I believe part of the problem is whether the schematic or the PCB are even close to the real design of the Jadis. Do you have an original Schematic?
Thanks, Nick
G said:
Gavin,
What you posted is the same schematic that Frank posted for me and what I posted here in a thread about the clone line stages.
It is NOT however anywhere close to the so called "Jadis" clone offered by others on ebay. As you stated in a prior post people would be better off making something and wiring point to point.
What you posted is the same schematic that Frank posted for me and what I posted here in a thread about the clone line stages.
It is NOT however anywhere close to the so called "Jadis" clone offered by others on ebay. As you stated in a prior post people would be better off making something and wiring point to point.
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