Matt Riley Posted November 10, 2012 Share Posted November 10, 2012 Hi guys, So I've got a couple of old comps on the bench in need of some pots and I wondered whether any of you guys might be able to help me source the correct replacements (at minimal cost!) First one - Drawmer 221 with a broken threshold pot! So all I need to sort out on this one is the appropriate replacement pot (I've got the knob for it!) The pot appears to be a 16mm one with approx a 4mm slightly squared off shaft marked 22K B - so I presume its a 22k ohm linear pot? http://i282.photobucket.com/albums/kk277/mattril87/photo1.jpg Second one - a DBX 266 So a whole load of pots required here as well. There are 3 marked B50 K (50k lin?), One marked C5k (5k log?), one marked A50k (50k ohm log?) and one marked 20K A (20k ohm log?). Same size as the drawmer one but with a different shaft diameter of approx 6mm. http://i282.photobucket.com/albums/kk277/mattril87/photo4.jpg So yeah , if anyone's done these fixes before and found the appropriate CPC numbers then it would be awesome if you could share them- if not I'll get onto the CPC website and keep you posted on what I find. M Link to comment Share on other sites More sharing options...
Mixermend Posted November 10, 2012 Share Posted November 10, 2012 Potentiometers for items of gear are often a problem to obtain - the Drawmer items are British made OMEG types - these are probably best obtained from Drawmer, who should be pleased to help. Their shafts are usually 'D' shaped and 4mm in diameter. The dbx types are normal 'commercial' type pots - but the types normally found in the usual catalogues usually have splined shafts (Rapid Electronics have a selection available). 'D' shaped 6mm shafts are not as common. Bearing in mind the different PCB pin configurations, shaft diameter, type and length - I have usually found it best to always try and obtain spares from the manufacturer or distributor - if they are still around. If not - then usually a substitute can be found - but some engineering is often required to make them fit...... Link to comment Share on other sites More sharing options...
Sound Man Posted November 10, 2012 Share Posted November 10, 2012 Maplin do a 22k pot which looks very similar to what you need. The spindle will need to be modified so the the existing knob will fit onto it thou. Order code JM72P They do the other values that should be suitable for the DBX unit. David Link to comment Share on other sites More sharing options...
Matt Riley Posted November 10, 2012 Author Share Posted November 10, 2012 Thanks for the replies guys - I'll get onto the manufacturers and see what I can find! Matt Link to comment Share on other sites More sharing options...
bigclive Posted November 11, 2012 Share Posted November 11, 2012 First picture... Single sided board with phat trax = totally repairable and probably designed by someone with pedigree. Looks like fairly standard components, and with some desoldering braid (copper braid impregnated with flux) to mop up the solder from the pads, I'd say that looks like a fairly easy repair, even to someone just starting with soldering. Link to comment Share on other sites More sharing options...
laolu Posted November 11, 2012 Share Posted November 11, 2012 I'm not sure the letters A, B, C represent log, lin, and ...? But I'm sure to have the right "configuration" (if you can say that about a pot) is very important. On the other hand, it might be worthwhile to consider saving the old pots, depending what's wrong with them. If they are not broken, just a bit scratchy, a drop of K60 may help. Just a thought. Norbert Link to comment Share on other sites More sharing options...
alistermorton Posted November 11, 2012 Share Posted November 11, 2012 I'm not sure the letters A, B, C represent log, lin, and ...? But I'm sure to have the right "configuration" (if you can say that about a pot) is very important. Usually level controls are log, whereas pan pots and "tone" controls such as on parametric eq are linear, but there can be exceptions. Link to comment Share on other sites More sharing options...
themadhippy Posted November 11, 2012 Share Posted November 11, 2012 I'm not sure the letters A, B, C represent log, lin, and .yep they do,c is often antilog Link to comment Share on other sites More sharing options...
DrV Posted November 11, 2012 Share Posted November 11, 2012 I'm not sure the letters A, B, C represent log, lin, and .yep they do,c is often antilog Although I have come across one manufacturer in the past (was it Alpha??? might well not be!) whose 'A' pots are lin and 'B' pots are log Dave Link to comment Share on other sites More sharing options...
Matt Riley Posted November 13, 2012 Author Share Posted November 13, 2012 Hi guys, Just to let you know my progress sourcing the bits - the Drawmer one, like John predicted was very easy, costing about £4 and despatched pretty quickly. The DBX one was a bit more involved. I was put in contact with EMS (www.electronicmusicservices.co.uk/contact.htm) as DBX don't deal direct with the little people like me. Their prices were a bit steep (£11.50 per pot!) so I found a nice chap on ebay (Henry Walmsley, Southampton) who would sell me the rest of the bits for under a tenner and only purchased the Alpha c5k detented ratio pot from EMS. Now lets hope it all arrives and fits together nicely! M Link to comment Share on other sites More sharing options...
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