[Hammarlund] Capacitor replacement

[Joe Connor]

 I'm with Wes and Loren on the clipping. 
1. With the bathtubs, I didn't use a heat gun. I cut off the back of the cans with a Dremel cutting wheel, and the innards came out pretty easily. It looked good because the back of the cans are hidden by the chassis when the cans are reinstalled.
2. The most difficult part of the job is removing and reinstalling the RF deck. Both the SP-600 Anthology and the Radio Boulevard site give detailed instructions, but that might be something you'd want to ask about on here because I'll bet some of the guys in here have figured out some useful short-cuts.
3. The biggest pain was one isolated cap located in a pod by the RF deck. That one cap took an awful lot of work to get to.


                             Joe Connor
    On Tuesday, March 1, 2022, 11:24:30 AM EST, Loren Burkett <lcbur at sbcglobal.net> wrote:  
 
 I think Chuck Ripple (sp) did not like clipping out the old caps.  I do like it as it does less damage and makes a cleaner job.  The anti fungus coating is a factor also.  The heat gun on the bathtub caps was a mess for me.  Even though it changed the look I removed them in my last one and added terminal strips. 

> On Mar 1, 2022, at 9:23 AM, wes Bolin <k5apl41 at gmail.com> wrote:
> 
> I recapped my SP600JX21 back in 2013.  I think I replaced over 55
> capacitors.  The big electrolytics came from Hayseed Hamfest.
> 
> I used the technique of cutting out the stock capacitors, leaving short
> leads from the soldered connections.  The replacement capacitors had their
> leads wound in a coil and trimmed.....the coil slipped over the short lead
> stubs and then were soldered.  A good mechanical and electrical connection
> resulted.
> 
> My shack is an out building that is not environmentally controlled.  Very
> hot in the Summer and very cold in the Winter.  The SP600 sat during months
> of inactivity due to other projects, timing, etc.  Today it works as it did
> 8 years ago. No failures due to the recap process. In fact, the only
> problem is that the Signal Meter has decided to stick half-scale sometimes,
> depending on temperature.
> 
> IMO this technique is far less invasive and prone to damage as opposed to
> desoldering all capacitor connections.  BTW I used a heat gun to remove the
> back plate of the bathtub caps, soldered replacements in the tub shell, and
> then reattached them to the chassis to keep the original "look".
> 
> It is quite a project, but worth the time and expense to do it, IMO.  Have
> fun.
> Wes
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