[sdiy] PAiA 2720/R rebuild

Tom Wiltshire tom at electricdruid.net
Mon Oct 27 20:03:37 CET 2014


Absolutely agree. Looking at my old stomp boxes with the back off is like a soldering horror show, but you've gotta learn somehow, and getting stuck in is one of the best ways.
great to
I doubt many PAIA synths ever looked so good. Nice work indeed.

Tom

On 27 Oct 2014, at 17:45, John Speth <jspeth at avnera.com> wrote:

> I too drooled over the affordable PAIA goods as a teenager.  My paper
> route was not enough to fund my desire.  But I'm sure you can forgive the
> poor build quality.  Whoever built it was learning what we've all
> developed passion for.  I still have some of my first-built stuff from 40
> years ago (the ones that actually worked).  They're far from high build
> quality too. :)
> 
> My hat's off to your for tackling that project!  Nice work.
> 
> JJS
> 
>> Yeah, poor soldering on DIY kit. I was restoring Formant once (well, I
> still
>> am) and literally every solder joint on every board had to be sucked and
>> resoldered. All panel wiring removed and redone from scratch as it was
> sooo
>> wrong it hurts.
>> 
>> Anyway, great job on your PAiA! I can imagine how tough that was.
>> But I miss "before/after" photos, they make any restoration report
> great.
>> 
>> Roman
>> 
>> W dniu 2014-10-27 00:30, Dave Brown pisze:
>>> 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-----
>>> 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-----
>>>> 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
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