From Fredrik Zetterling Sent Fri, Jun 29th 2018, 09:43
From Fredrik Zetterling Sent Fri, Jun 29th 2018, 09:43
My limited experience in getting in to epoxy is that it is quite hard.=20 Mechanical: this works, but you need to be careful to not destroy the encas= ed components.=20 Heat: also works fine, but you risk burning the encased components.=20 Cold: never tried, but cooling it with a spray and then shattering it shoul= d also work.=20 I have used a combination of mechanically removing big chunks and then usin= g a small=20 heat source( i e soldering iron) burning/melting away the stuff. I am not s= ure that there=20 are any chemicals that you can use safely that will reliably work.=20 /F ________________________________________ From: Alessio Caligiuri [xxxxxxx.xxxxxxxxx@xxxxx.xxx] Sent: Friday, June 29, 2018 10:55 To: James R. Coplin Cc: Justin Maxwell; xxxxxxxx@xxxxxxxxx.xxx Subject: Re: [AH] ARP2600 VCA - Re-build the 4010 module Yes, the 4010 VCA is encased in epoxy. Since it isn't working properly, I'm= thinking of opening the enclosure and try to "de-polimerize" the epoxy... = do you know if it is feasible? Thanks all for your interest in my question. Best regards, Alessio 2018-06-28 16:23 GMT+02:00 James R. Coplin <xxxxx@xxxxxxx.xxx<mailto:james@= ticalun.net>>: It=92s weird how little information there is about the 4010 version of the = vca out there. I notice on the notes to Oakley=92s 4019 vca module that he = said he couldn=92t really find any info on the 4010 either. Is the module e= ncased in epoxy? James On Jun 28, 2018, at 7:21 AM, Alessio Caligiuri <xxxxxxx.xxxxxxxxx@xxxxx.xxx= <mailto:xxxxxxx.xxxxxxxxx@xxxxx.xxx>> wrote: Thank you Justin for the reply. I've just looked for 4010 VCA at CMS but th= ey haven't; only the 4019 is available. However, I'm an Electronic Engineer and my purpose for this project is to r= ebuild each circuit by myself. I know that some high quality pre-built modu= les are available at CMS, but I prefer to study the ARP circuits to learn h= ow they work and to get the satisfaction of a complete homemade restore. So= me times ago, I got this ARP2600 in very bad conditions: not only electrica= l problems but also "mechanical" problems; I have already built two 4027-1 = VCOs (because only one of them was present) and they works very fine (also = in terms of thermal stability). Now my issue is to find the schematic of the 4010 VCA or someone that can t= ell me the differences between the 4010 and the 4019. Many thanks! Best regards, Alessio 2018-06-28 0:09 GMT+02:00 Justin Maxwell <xxx@xxxxxxx.xxx<mailto:xxx@xxxxxx= 4.com>>: Mine was broken and I just bought a replacement from CMS. Unless you're rea= lly into the idea of this project I would recommend getting his. It's clean= er as well. On Wed, Jun 27, 2018 at 1:59 PM, Alessio Caligiuri<xxxxxxx.xxxxxxxxx@xxxxx.= com<mailto:xxxxxxx.xxxxxxxxx@xxxxx.xxx>>wrote: Dear all, I'm dealing with an ARP2600 that has a broken 4010 VCA module. Only the exponential control works, while the linear control is not respons= ive. In fact, the "initial gain" slider doesn't affect the VCA output. I would like to re-build the broken module but I can't find the schematic. I found only drawings for the 4019 module. What is the difference between 4= 010 and 4019 VCAs, except external dimensions? Can you please help me? Many thanks! Best regards, Alessio