[R-390] SP-600 Recap

[Al Parker]

Hi all,
	I held my tongue on Tisha's initial post, I didn't think she was 
talking about removing the rotating turret, but figured I'd wait and 
see.  Chuck, we've never met, but I hope we will sometime, now that 
you're back in "circulation".  And, I've never seen your video, tho' 
have heard lots of good about it.
	Bill says it right, for me.
	I have done dozens of SP-600's, but not to the full tear down 
everything-polish-"restoration" level, I'd rather call my work 
"refurbishment".  Front panels may be stripped & repainted, side plates, 
chassis, IF cans, etc. cleaned and maybe buffed, whatever I or the owner 
wants.  I have never removed the rotating turret, because I could find 
no reason to do so.  Curved hemostats help on the clips on the removable 
modules.
	The RF deck is the one thing that requires care and attention, as Bill 
stated, particularly setting the band-change to mid-way between bands. 
Some of the 27 BBOD's are tough to remove without collateral damage. 
Hakko is my friend there.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 12/20/2012 1:28 PM, kirklandb at sympatico.ca wrote:
>
> The turret assembly is quite easy. Drop the bottom plate and you can pull off the individual segments.
>   the spring clips are a little tricky though.
>
> The RF deck, i.e. the side of the RF assembly with the tubes in it is another matter.
>
> A 45 watt iron really helps, as does the hakko desoldering gun + dental picks.
>
> When putting the RF deck back in place, as I recall you want the turret section about 1/2 way
>   between bands so that the fingers do NOT engage the pins.
>
> Yes I have broken a finger.
>
> The caps in the RF section are all 0.01uf.
>
> IF cans have 0.022 and some of the bottom.
> If they are BBODs keep the 0.022 and sell them to the Audio folks for $15 or more (assuming they are decent).
>
> nate.html
>   		 	   		
> ______________________________________________________________
On 12/20/2012 12:59 PM, chuck.rippel at cox.net wrote:> Watch the Video 
before attempting,  Watch the Video before attempting,
> Watch the Video before attempting, Watch the Video before attempting,
> Watch the Video before attempting, Watch the Video before attempting !!!!
>
> Tisha is >absolutely right<, removing the rotating turret from an SP-600
> has almost zero room for error.  Add to that, replacing the capacitors
> has zero room for error.  You'll be doing something like.... 27 or so
> total.  You can't do 5, put the turret back, reconnect the 455 KC IF
> wires on the side, test your work and keep repeating till the caps are
> done.  Every time you remove the turret, the chances of something
> breaking increase by an order of magnitude.  Break off one of the
> "fingers," the entire band is done.
>
> The capacitor replacements must be accomplished in a single, proper
> removal of the turrett.   You'll want to use all 1KV ceramic disc
> capacitors in the turrett.  As I recall, they are all .01ufd.
>
>
> ---
> No  trees were killed to deliver this message.  However, a large number
> of electrons were terribly inconvenienced.
>
> Chuck Rippel