[Jukebox-list] AMI TI-1 amp rebuild

[bakerrj2 at valornet.com]

Thanks Jay and Ron for your quick and helpful responses.  In my case, the neg. leads from the transformer secondary attach to the twisted mounting terminals on the exterior of the cans.  One can has a single cap, the other can has three caps but they are all of equal value. I have located all the pos. leads that come out of the center part of the cans.  I will attach the neg leads of the new caps to these twisted terminals and attach a new terminal strip to sort out all the postive leads and resistors.  The other twisted mounting terminals with leads attached must be grounding terminals??
I assume these are OK to leave as is.

Thanks again

Jack

> 
> From: Jay Hennigan <jay at west.net>
> Date: 2007/01/26 Fri PM 02:06:29 CST
> To: Jukebox mailing list <jukebox-list at lists.netlojix.com>
> Subject: Re: [Jukebox-list] AMI TI-1 amp rebuild
> 
> bakerrj2 wrote:
> > I am in the process of rebuilding the amp of my TI-1.  All bad resistors and diodes have been replaced and am currently replacing the caps from a kit that I got from Vern Tisdale.  (Thanks Vern for lableing each cap per the schematic.)  Replacing the caps is pretty straight forward except when it comes to the "can" type filter caps.  I would like to leave the old "cans" in place for appearance purposes and install the new caps below the chassis.  The problem is that there are other terminals besides the caps pos. and neg. leads attached to the existing caps that I am unsure what to do with.  They don't seem to appear on the schematic.
> >   
> > Can I attach the new caps to the existing terminals or should I install new terminal strips and move the pos. and neg. leads to these strips?  If so will the other attachment points have to be moved as well?
> > 
> > As you can tell from the above question,  I am a rank rookie in this endeavor.  Any help offered will be greatly appreciated.
> 
> The can style capacitors often contain several capacitors within the one 
>   can assembly.  The negative for all the caps is the can itself, 
> connected to the four (three for the smaller cans) twisted lugs around 
> the outer diameter that hold the can in place.  This is *USUALLY* 
> chassis ground, unless the can is mounted on a fiber insulating baseplate.
> 
> The positive terminal(s) are in the center.  The capacitors within the 
> can may have different values, so it is important to match the 
> replacement caps to the correct section.  You can do this by tracing the 
> wires and matching to the schematic, and also by carefully examining the 
> base of the can and the markings on the can itself.
> 
> The positive terminals protrude from a fiber insulator at the bottom of 
> the can.  There will be a shape punched out of the insulator for some of 
> the terminals, either no punch, a triangle, a square, or a "D" shape. 
> The printed markings on the can will indicate the value associated with 
> each symbol.
> 
> On a multi-section capacitor, the schematic will use a letter suffix to 
> denote the sections.  So a single can may have four capacitor symbols on 
> the schematic, like C401A, C401B, C401C, C401D.  This means that you may 
> use up to four individual replacement capacitors to replace one can. 
> Vern's parts are probably labeled with the complete schematic designator 
> including the suffix letter.
> 
> You will need to remove all of the wiring from each non-grounded 
> terminal on the existing can and relocate it to a terminal strip. 
> Leaving the old capacitor connected to the circuit is asking for 
> trouble.  It's certainly OK to leave it in place physically for cosmetics.
> 
> --
> Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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