kato

Re: Amek M2500 Build and Support Thread
« Reply #20 on: June 09, 2020, 09:51:23 AM »
One of the 4 channels is stuffed with components already.

Not trying to make this a sales post, but I'd hate to see them go to waste.

If anyone is interested, $10 for all 4 PCBs plus shipping.
I can leave the etch resist on, or remove it with acetone prior to shipping leaving clean copper.



« Last Edit: June 15, 2020, 08:41:12 PM by kato »


analogguru


analogguru

Re: Amek M2500 Build and Support Thread
« Reply #22 on: June 15, 2020, 04:44:06 PM »
I would have posted pictures of the original mic-preamp-pcb if the upload-folder of this forum would not be full..... :-\
« Last Edit: June 15, 2020, 05:07:56 PM by analogguru »

jensenmann

Re: Amek M2500 Build and Support Thread
« Reply #23 on: June 18, 2020, 05:05:39 PM »
If the maintenance has been done carefully then this desk is a bargain.
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

Re: Amek M2500 Build and Support Thread
« Reply #24 on: June 24, 2020, 01:18:28 PM »
Sorry to bump an ancient thread. Someone recently PM'ed asking for the original files. They had been deleted.

Here is a new link to the DIY version of the Amek 2500 by Olaf Matthes.

It will prompt you to create a dropbox account, but I believe you can bypass that request and download without creating an account.


Hi Matthew,  its me again :)

What the power current you reckon to drive this 2 pres?

Thank you

Ipin

kato

Re: Amek M2500 Build and Support Thread
« Reply #25 on: June 24, 2020, 02:20:17 PM »
I would guess .2A @ 15v would be sufficient.

Re: Amek M2500 Build and Support Thread
« Reply #26 on: July 09, 2020, 01:28:46 PM »
I would guess .2A @ 15v would be sufficient.

Thank you Matthew.   :)

Btw, with this design, is it ok to put the original TL072 ic's on the board?
   

kato

Re: Amek M2500 Build and Support Thread
« Reply #27 on: July 09, 2020, 03:10:25 PM »
Thank you Matthew.   :)

Btw, with this design, is it ok to put the original TL072 ic's on the board?
 

Yes.
I could be wrong, but I don't think there are any significant changes from the original that would prevent a TL072 or TLE2072 from working fine, and probably sounding exactly the same as the more modern replacements.

Re: Amek M2500 Build and Support Thread
« Reply #28 on: August 01, 2020, 10:48:10 AM »
Yes.
I could be wrong, but I don't think there are any significant changes from the original that would prevent a TL072 or TLE2072 from working fine, and probably sounding exactly the same as the more modern replacements.

Thank you Matthew.

I've finished the soldering job for 2 boards, but haven't tested it yet, just want to make sure everything is alright  :)
All the ICs are TL072, hope its okay, and where is RG going? Potentiometer? (1kohm?) or Rotary gain switch?

Ipin

Ricardus

Re: Amek M2500 Build and Support Thread
« Reply #29 on: August 01, 2020, 11:35:54 AM »
Looks good.

I've been interested in building some Amek preamps. Not sure which ones people like the best, and which ones have any PCBs available, but it is on my list.
Audio mastering for hire..


kato

Re: Amek M2500 Build and Support Thread
« Reply #30 on: August 01, 2020, 01:17:11 PM »
Thank you Matthew.

I've finished the soldering job for 2 boards, but haven't tested it yet, just want to make sure everything is alright  :)
All the ICs are TL072, hope its okay, and where is RG going? Potentiometer? (1kohm?) or Rotary gain switch?

Ipin

I used a 1k reverse log pot.
A rotary switch would probably work as well, similar to the green preamp.

Re: Amek M2500 Build and Support Thread
« Reply #31 on: August 01, 2020, 01:51:16 PM »
Looks good.

I've been interested in building some Amek preamps. Not sure which ones people like the best, and which ones have any PCBs available, but it is on my list.

Thank you Ricardus, Haha, yer I made a pair of this version too  ;D  I'll compare them tomorrow,

Ipin

Re: Amek M2500 Build and Support Thread
« Reply #32 on: August 01, 2020, 01:55:29 PM »
I used a 1k reverse log pot.
A rotary switch would probably work as well, similar to the green preamp.

Thank you Matthew! You rock  8)
I'll try it tomorrow and let you know, can't wait to compare them with my Greens and the SSLs

Ipin

kato

Re: Amek M2500 Build and Support Thread
« Reply #33 on: August 01, 2020, 02:40:08 PM »
Thank you Matthew! You rock  8)
I'll try it tomorrow and let you know, can't wait to compare them with my Greens and the SSLs

Ipin

Check out Pier Paolo's schematic in an earlier post.

He recommends a couple 220µF caps inline with the pot, which I think the Green preamp used as well.

jensenmann

Re: Amek M2500 Build and Support Thread
« Reply #34 on: August 01, 2020, 03:02:16 PM »
Better use 2200uF, not 220uF. Typo?
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

Re: Amek M2500 Build and Support Thread
« Reply #35 on: August 02, 2020, 08:15:57 AM »
Great! Thank you Guys  :)

Ipin


 

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