bkrop Posted April 19, 2003 Share Posted April 19, 2003 What can I use to clean the chassis to remove the dirt and pitting of the metal? Quote Link to comment Share on other sites More sharing options...
NOSValves Posted April 19, 2003 Share Posted April 19, 2003 Dean oh Dean this man needs your guidance !! Whatever you do be carefull if you use any kind of solvent put it on a rag first to be carefull not to leak it under the chassis and in the adjustment pots !! Dean uses different types of sand paper and steel wool or something and they turn out stunning with a brushed aluminum type finish. Do a search for "Craigmeister Scott 299a still for sale" back about 6 months ago there is a picture of Dean's handy work. Craig Quote Link to comment Share on other sites More sharing options...
Deang Posted April 19, 2003 Share Posted April 19, 2003 NO SOLVENTS!! The metal job on the Scott was done using a Scotchbrite scratchpad (equivelant to .000 steel wool, but does not fray), and 1500 grit cloth. Start with the scratchpad to loose all surface grit, grease, stains, etc. It's important to only go in one direction as much as possible. When finished, vacuum. Vacuum well, especially the tube sockets. Then begin again with the cloth. One direction only. It's not always possible to do this because of things you have to get to with wierd angles. Keep in mind that the cloth is removing a bit of metal, and so leaves a 'grain'. Going in one direction helps it to make it not to look like, well -- like some idiot scoured it with an SOS pad:) The whole surface will turn black from this process. When finished, used windex to clean everything off (spray the windex on a clean cotton rag, not on the amp). A tee-shirt will do nicely for this. At this point, go back over it again with the scratchpad to restore the satin look it started with. Again, one direction only. When you are happy with the look, vacuum again -- pay special attention to the tube sockets. Remove the bottom plate of the amp and vacuum. I used the horsehair brush attachment. When done, remove the brush and do the tube sockets from underneath. Quote Link to comment Share on other sites More sharing options...
MBM135 Posted April 19, 2003 Share Posted April 19, 2003 Wow Dean, nice looking amp! Really sparkles! Mike Quote Link to comment Share on other sites More sharing options...
NOSValves Posted April 19, 2003 Share Posted April 19, 2003 Yea all that and then the Ding Dong sold it !!! Quote Link to comment Share on other sites More sharing options...
bkrop Posted April 19, 2003 Author Share Posted April 19, 2003 Thanks Dean ! I would of thought to cover the sockets with masking tape to prevent metal dust and such from falling in. I have x to 5x fine steel wool for furniture refinishing, what grit would you recommend? Quote Link to comment Share on other sites More sharing options...
bkrop Posted April 19, 2003 Author Share Posted April 19, 2003 Sorry, I misread your original post, it was 1500 grit cloth, my mistake. Thanks again. Quote Link to comment Share on other sites More sharing options...
Deang Posted April 19, 2003 Share Posted April 19, 2003 NO STEEL WOOL -- that stuff goes everywhere -- bad, bad, bad. Use a Scotchbrite scratchpad, or go to the hardware store and buy a similiar thing used for wood finishing, often referred to as a "finishing pad". Even if you tape the sockets, make sure you vacuum every square millimeter of the amp when you are done. Quote Link to comment Share on other sites More sharing options...
bkrop Posted April 19, 2003 Author Share Posted April 19, 2003 Dean: Thanks again, and I am sorry I failed to mention that the amp pictured is gorgeous! So clean you could eat off it! Quote Link to comment Share on other sites More sharing options...
Deang Posted April 19, 2003 Share Posted April 19, 2003 I have four kids -- I eat off of it all of the time. Quote Link to comment Share on other sites More sharing options...
Randy Taylor Posted April 20, 2003 Share Posted April 20, 2003 Craig, Looking at the picture of the back of Deans Scott 299B on top is that the Bias Mod you were taking about in your E-mail to me last week. If it is how does it work and how does it make it easier to bias the amp. Thanks, Randy Quote Link to comment Share on other sites More sharing options...
Deang Posted April 20, 2003 Share Posted April 20, 2003 That is the NOSvalves first generation bias mod. The new one Craig has set up is really slick, and doesn't have that stickin up in the air thang going on. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted April 20, 2003 Share Posted April 20, 2003 Randy, It doesn't just make it easier ! It makes it truly possible to bias the amp. None of the Scott amps have a true full bias adjustment setup. Some will get you close but none do it to its perfection. I add test points for every output tube and separate adjustment for each channel. Each of the Scott amps start out with a deferent setup. The amp you see above is a 299A which comes factory with a single Bias voltage adjust pot and no way to properly measure it. It also come with balance pots for each channel but no reliable way to balance it. The 299B comes with proper test point to set the bias for each channel but no way to balance the bias for each tube so you could be running one tube a 25 ma and the other at 30ma or worse depending on how well matched the tubes are. With the tube variations today of even the supposed match quads you buy getting the Bias properly adjust for EACH TUBE is very important for a good balanced sound and also tube life. Craig Quote Link to comment Share on other sites More sharing options...
Randy Taylor Posted April 20, 2003 Share Posted April 20, 2003 Craig, I thought (and I could be wrong here ) that when you you did the DC balance that we talked about that we were balanceing the two tubes that were in each channel and than you did the bias again and that would bias all the tubes correctly, but if this is indeed true your idea would be easlier and faster to do anyway and keep me from haveing to take the amp apart to do the DC balance everytime I wanted to check the Bias or change tubes and reset the bias. If you have any pictures of what it would look like (on the 299B) post them so I can see what you are talking about, I might want to send you my amp sometime for such a Mod. Randy Quote Link to comment Share on other sites More sharing options...
NOSValves Posted April 20, 2003 Share Posted April 20, 2003 Randy, It works and does a okey job but not perfect and not from above the chassis dealling with non leathel voltages ! Its just not best way to do it or the easiest. Craig Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.