[sdiy] PAiA 2720/R rebuild

[Dave Brown]

He didn't on this one.  I've never seen so much flux all over everything.
Leads extended through quite far, were bent over, and about 3X too much
solder was used.  I don't think it was acid core solder but it had about
that much flux on it.  I ended up sucking every pad and resoldering and
fixing the pads that had lifted.  I think the sheer weight of the solder on
the underside was enough to lift the pads!

Dave

-----Original Message-----
From: David G Dixon [mailto:dixon at mail.ubc.ca] 
Sent: Sunday, October 26, 2014 3:59 PM
To: 'Dave Brown'; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] PAiA 2720/R rebuild

Wow!  Looks great!  That was on my Christmas wish list from the age of 12 (I
turn 50 on Wednesday).  Santa never brought it.  I did try to build a Gnome
with a friend in 1976, and failed utterly (he actually bought it, and was
too impatient to use flux with the solder - every solder joint was stone
cold).  I didn't attempt Synth DIY again until 2008.  Now, of course, I look
at the PAiA stuff, and can't believe how cheap it looks and how simple it
is.



> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dave Brown
> Sent: Sunday, October 26, 2014 2:00 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] PAiA 2720/R rebuild
> 
> In case anyone is interested, I just was given a PAiA 2720/R synth 
> that I decided to restore.  A lot of the work was improving the 
> construction techniques of the original builder and dealing with the 
> general degradation of the electro-mechanical parts over time.  There 
> is a list on the site but the biggest issue was rebuilding the Pratt 
> and Read keyboard which meant everything had to be disassembled.  The 
> wood cabinet needed some TLC but the only improvements that I made 
> were the increase in PS filter caps and the replacement of just a 
> handful of parts.  Most all the wiring and soldering though had to be 
> redone and it required a lot of cleaning.  The keyboard S&H could 
> benefit from a modern op-amp but I decided to keep it original.
> 
> Photos and information at
> http://modularsynthesis.com/paia/2700/2700.htm
> 
> David J. Brown
> Email davebr at earthlink.net
> Website http://modularsynthesis.com
> 
> 
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