Thomo said:
I hope not!
Reading Audiocom's spiel about the sc4, they say it has separate on-board low noise regs for dig and analogue.
Does anyone know if there's any way to split these on the sc2 and feed them with off-board regs?
Of course it can be done, the circuit will need a good looking at but yes anything is possible.
Brent
I've started a new thread for the clock thingy, so feel free to contribute, comment or anything else.
Superclock Mod Thread
Cheers,
Lee.
Superclock Mod Thread
Cheers,
Lee.
navin said:
Hi Navin
Yes my amplifiers produce a lot of heat, quite nice in winter.
(It can be switched to class AB) The design started about 10 years ago, running class AB with Mosfet output stage. After several versions, I ended up with massive heatsinks, class A and 1kW power supplies per channel.The pre-amp is a discrete dual mono design with balanced and unbalanced inputs / outputs with 2 x 50VA transformers and remote control.
The speakers are manufactured of 32mm MDF, it is a 2.5 way transmission line design, constructed to allow for exact time alignment of all drivers as well as the front firing port. I use 2 x Seas Excel 6.5" magnesium cone woofers, one for mid / bass and the other only on bass, and a Seas Millenium tweeter. In the crossover network I use foil coils and Hovland capacitors.
For interlinks, speaker and power cables, I use Ecosse Monocrystal cables.
Regards
André
External tranny and other things..
Time for a report.....
Large external transformer for the opamps (225VA) is a success. Loads of bass, clean mid. I am going to try an 80VA, just to compare. The 225VA is a little heavy! This was to replace a small 6VA tranny. 12000uF Audio Elnas used, with ultra fast diodes, feeding schulz regs in the CD63KI.
Sound now compares well with my Linn LP12 for bass, probably even more detailed, although they do obviously sound "different". Now I will try a new PSU for the preamp in my PM17KI.
As for A class amps, I have always biassed my AB class stages more towards A class for the first few watts of output power with good effect, and much less heat! YOu have to be carefull though. I have to monitor temperatures carefully for the first few hours just in case i have taken things toooo far.
Cheers,
Geoff
Time for a report.....
Large external transformer for the opamps (225VA) is a success. Loads of bass, clean mid. I am going to try an 80VA, just to compare. The 225VA is a little heavy! This was to replace a small 6VA tranny. 12000uF Audio Elnas used, with ultra fast diodes, feeding schulz regs in the CD63KI.
Sound now compares well with my Linn LP12 for bass, probably even more detailed, although they do obviously sound "different". Now I will try a new PSU for the preamp in my PM17KI.
As for A class amps, I have always biassed my AB class stages more towards A class for the first few watts of output power with good effect, and much less heat! YOu have to be carefull though. I have to monitor temperatures carefully for the first few hours just in case i have taken things toooo far.
Cheers,
Geoff
Re: External tranny and other things..
Excellent , are those (12000uF) the blue caps used in the pm66KI amp?
I biased my well modded PM66KI more class A and i over did it the first time and the output popped while i was still adjusting it after a rebuild. I find adjusting it to the normal then tweaking up a little at a time works well (Well only if you monitor idle current from cold). Once its done the sound is much better.
I did have to upgrade my heatsinks with some custom ones as the standard 66KI sinks were not up to the job.
My 30VA inside the 63KI made a good improvement - even better than the 15VA I used before. Same gains you talk about. Worth the effort as it pushes the quality upwards
Brent
geoffgjones1 said:
Excellent , are those (12000uF) the blue caps used in the pm66KI amp?
I biased my well modded PM66KI more class A and i over did it the first time and the output popped while i was still adjusting it after a rebuild. I find adjusting it to the normal then tweaking up a little at a time works well (Well only if you monitor idle current from cold). Once its done the sound is much better.
I did have to upgrade my heatsinks with some custom ones as the standard 66KI sinks were not up to the job.
My 30VA inside the 63KI made a good improvement - even better than the 15VA I used before. Same gains you talk about. Worth the effort as it pushes the quality upwards
Brent
Hi Brent,
Yes they are the same! Nice caps. Swapped them out of my sisters PM66KI for a couple of 22,000 HQ pannies that I had lying around..... with little effect.
I did exactly the same thing with my sisters PM66, blew one channel. Managed to get a few transistor spares from marantz europe. More heatsinks added now!
I will be checking out the 80VA this weekend, and report back.
Cheers,
Geoff
Yes they are the same! Nice caps. Swapped them out of my sisters PM66KI for a couple of 22,000 HQ pannies that I had lying around..... with little effect.
I did exactly the same thing with my sisters PM66, blew one channel. Managed to get a few transistor spares from marantz europe. More heatsinks added now!
I will be checking out the 80VA this weekend, and report back.
Cheers,
Geoff
What value are those cans? I really do not think that my sister would really appreciate them to that extent, but maybe I need to try some in my PM17?
Anyway, I am going to replace my lazer soon, it must have aged at least a bit by now. Where could I get a unit from? Would I be better off getting a new complete drive?
cheers,
Geoff
Anyway, I am going to replace my lazer soon, it must have aged at least a bit by now. Where could I get a unit from? Would I be better off getting a new complete drive?
cheers,
Geoff
geoffgjones1 said:
The caps are 56V 22000uF. They were originally £200+ each. I managed to get them on the buyers section of this forum for £60 the pair not used. I think they are too big to fit in the PM17.
I would leave the laser if it is running ok, there are a lot of badly set up ones out there to buy, avoid Grandata for sure. I get all mine from CPC now, they come with the traverse and cost less than £20
Brent