IcePower ASP1000 - Tweaking/Mods/Upgrades

[DDriver]

arthur, why do you use ampty and so “small” case with this "big" amplifier?

 

[arthur]

The external size of this small case is 18”W x 7”H x 15.5”D
I need digest my asp modules stocks . Since i can not find bigger metal housing for av power amp, I only accept to use this

 

[barrows]

YES....

Wow...

Nice!

Where did you get those input buffers?

I shure would like to get my hand on a pair of those.

I would also like to know how I could get my hands on a pair of input buffers like these.

 

[arthur]

Friends interested please check again #16 I attached
R1 R2 C1 are ground breaker,
R5 is the loading resistor after the output of 1545a
R4 and C3 are the loading for the optimal square wave response....
dc filter are 10 ohm and 33 uf
other component are for trigger standby of the asp modules
No more secret

 

[jalejos]

From the comments in the various reviews, it looks like this circuit is diode voltage-doubler directly rectifying the 120/240 VAC to 305-320 VDC... See comments in these reviews:

bel canto ref 500M

bel canto ref 1000

SoundStage! Equipment Review - Bel Canto Design e.One REF500M Mono Amplifiers (4/2010)

Music in the Round #35 | Stereophile.com

Anyone have more info on the circuit yet? Can anyone get their hands on one to check out?

I've got a couple pair of the EVS 1000ASP-based and think that'd make a nice, not-to-hard to implement upgrade (as long as one was careful while working on it!).

Greg in Mississippi

P.S. BTW, at 300-320VDC, those two added caps don't have to be very large in value to provide the '400+ joules' of added energy storage! Something just under 100uf total should do it.

According to these articles, if you connect the output of a PFC to AC input of ASP1000, would it work?
The PFC output 385VDC, does not affect the input circuit (oscillator) of ASP1000?

 

[arthur]

thats what jrdg use
it works , but almost to the working limit.
since the capacitor rating is only 400v

 

[arthur]

my small AV amp progress:

 

[jalejos]

Arthur, from where are these input buffers?
Have problems with hiss or noise on the speakers?
Have you put ferrites on the speaker cables?
I have two ASP1000 modules and generate a little hiss/noise in the speakers and no way to remove them.

 

[arthur]

hi Jale,
1) please check post #44, I clone from M501
2) no
3) no

 

[lovro]

hi, would you be so kind to post the schematic of the input buffer ?

 

[Tiff_Needle]

Schematics would me more that welcomed...

Or even better, the possibility to acquire complete input buffers ready for plug n play.

Do you have any up for sale?

 

[arthur]

I can't disclose more in this forum.
Nor can I sell the kits because these are other people's IP
I ve already disclosed too much...............

 

[jalejos]

I recently installed two monophonic units,

but for the speakers I hear this noise.
https://files.me.com/jalejos/hxoklw.wav

I can not determine whether it is a ground noise or that the units are defective (two units?).
Would you need a line filter?
¿Coils in the speaker wire?
Does changing the earth?

Any idea?

 

[Erlend Sæterdal]

THe input is way to close to the output terminals. Take care can run into oscillation.

 

[Erlend Sæterdal]

And to close to the toroid ! This is a very very bad layout. Many amps have gone up in smoke because offf this kind of layout !

 

[jalejos]

Oooops!
I was wrong picture. Although the problem I think may be the same.

 

[jalejos]

Thank you very much. This weekend will prove it.

 

[fransiscan]

can anyone advise as to whether an input buffer affects sound quality regardless of the pre-amp used or is it just pre-amps such as tube or passive types.thanks

 

[Greg Stewart]

More info related to the Bel Canto AC Input Board...

According to these articles, if you connect the output of a PFC to AC input of ASP1000, would it work?
The PFC output 385VDC, does not affect the input circuit (oscillator) of ASP1000?

That 385v seems to work based on the pictures of the Rowland amps.

The Bel Canto board likely produces closer to 320v based on this article and circuit from Wikipedia:

Rectifier - Wikipedia, the free encyclopedia (see Voltage-multiplier rectifier section)

File:SwitcheableRectifier.jpg - Wikipedia, the free encyclopedia

Anyone gotten any more info on the Bel Canto board other than what the Wikipedia article implies. I did get these pictures from someone who had one of the amps, but no more info than that. Still looks like a pretty simple mod, but I'd really like to get my hands on one or get info from someone who has before risking my modules.

Greg in Mississippi

P.S. Best as I can tell, the Bel Canto board matchs the full-wave bridge voltage doubler circuit... my guesses based on the pictures are that it contains:

1. An input filter cap (black .33uf 250v x2 cap)

2. A fuse

3. 4 rectifier diodes for a full-wave bridge

4. A couple of high-voltage (200v?) electrolytics

5. A jumper plug to set 120v or 240v operation (voltage doubler or regular rectifier)

6. A couple of bleeder resistors

7. An output bypass cap

But there are a couple of small components between the rectifiers and the first cap that I can't make out... one looks like a surge protector, but funny to see it so far downstream. The other I can't make out at all.

Can anyone get to to one of these and get more intel?

 

[ddeacon]

Yes, I do have 500ASP for sale. Please contact me at d_sonic1@yahoo.com for further information.

Dennis