thanks Tom, i just received a cap kit from you for my r-4a 13 tube. worked like a champ. now i am going to do the ac-3 but i am going to try and repack the original paper caps with small axial caps. it was a mint supply but the guy shipped it to me in a box with a couple sheets of news paper around it. the chassis looked like a banana when i pull it from the box. i straightened it out but not mint anymore. i want to try and somewhat keep the original appearance.
Carey,kc5gtt On Sat, Feb 14, 2009 at 10:01 PM, Tom NØJMY <[email protected]>wrote: > Hi, Carey. First, as an aside, I stock new 125 uF @ 450V twist-lock cans > if that's the type you're interested in. > > As far as the differences in values they are generally not of concern. The > reason is that back when the can-caps were used in production, a typical > tolerance specified might be 20 uF plus 80% or minus 20%. So in this > instance you could have a cap with as high as 36 uF or as low as 16 uF and > it would still be within spec. > > Today, the tolerances are much tighter. A garden variety 22 uF cap will be > plus or minus 20% so that it's highest could be 26.4 uF or its lowest at > 17.6 uF. > > The rule of thumb for the industry is 10 replaces 10, 22 replaces 20, 33 > replaces 30, 47 replaces 50, etc. > > As far the decisions on substitutions made within re-cap kits, I can only > speak for myself. I have a simple rule of thumb. I ask Garey Barrell! :) > > There are certain applications where the replacement cap should be as close > to the original spec as possible. In other situations, the factory may have > been considering cost instead optimization, so it might be advantageous to > increase the capacitance. > > And, of course, sometimes we go back to using Tarot cards. > > I hope this is of help to you. I'd be interested in hearing what the other > fellows have to add. > > 73, > Tom NØJMY. . > > www.hayseedhamfest.com > Multi-section Can Capacitors > for Heathkit, Drake, Halli, Hammy, more... > > Carey Lockhart wrote: > >> i have been re-capping my gear. but it seem that the correct values are >> getting harder to find. lets say i need a 450volt 125uf electrolytic. but >> the only one i can find is a 100uf would that work? also lets say the >> difference between the need for a 20uf and a available 22uf. i have bought >> kits that had substitutions but never really thought about how they made >> their replacement decision. >> >> -- >> Carey Lockhart, KC5GTT >> Boerne, Tx. 78006 >> www.kc5gtt.com <http://www.kc5gtt.com> >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Drakelist mailing list >> [email protected] >> http://mailman.zerobeat.net/mailman/listinfo/drakelist >> > -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com
_______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
