Acquired a Gulbransen Premiere Theatre Organ

After an arduous pickup operation on friday night, I am now the owner of a broken Gulbransen Premiere Theater Organ.

David came over Sunday and pulled the parts that he wanted from the
organ. Leaving me with a hulk containing 2 61 note keyboards, a bunch of transistorized electronics and a Leslie speaker.

David was a super nice guy. We both graduated from Cary High in 1978. He
has grandchildren. I have an 8 year old and a 13 year old. Different life paths.

The keyboards on the organ may be too complicated for my purposes, but
I'll hang on to them for now. Hoping to get rid of as much of the rest
as possible. The mechanics inside the organ are pretty amazing....like
"I would never want to fix this" amazing. There is a huge speaker in
there, hidden behind a bunch of filter boards. Will check the
condition as soon as I get in there. The amp is transistorized, with
paper capacitors which are probably shot.

What is most interesting is the stuff that David brought me in exchange for the parts he wanted :

Two 61 note keyboards with replacement tone generators from a Schoeber
Recital Organ :

http://www.users.cloud9.net/~pastark/sorecita.htm

Schoeber Organs were built from kits. The original tone generators
were transistorized and kind of unreliable. Along with these keyboards
I got are the original tone generators PLUS replacement tone
generators built by Devtronix (Model 243-3).

Mentioned here :

http://www.users.cloud9.net/~pastark/sotnot7.htm

They both use top octave chip technology like the Paia OZ Organ :

http://www.synthmuseum.com/paia/paioz01.html

These replacement tone generator boards were also built from kits.

So, assuming they work (David said they did), I have the guts of two
61 note organs. They boards are not that big. I could build a super
compact, standalone organ. I was thinking of something that I could
mount to the wall in Aidan's room, and he could fold up out of the
way.

He also brought in a bunch of filter boards for the original stops.
And full documentation for everything, including an article on how to
design your own organ stops. I have all those stop buttons from the
Baldwin. Perhaps they would work with this.

Perhaps you can scan these docs for me...they are double sided and I'm
not sure how I would reassemble them after scanning on the Epson you
gave me.

I believe there is also another tone generator for the pedalboard,
which may work well with the Baldwin pedals.

Interesting stuff.

Recycling the Baldwin 172 - the keyboards

Got a non-working Baldwin 172 from Craigslist for free. Took it home, it made some sounds, but could never quite get it to behave. The next day, all I could get was a single droning note. So on to the parting. What is the value in a 1983 vintage organ with cheesy built in sound effects? Even with non-functioning tone generation, it is loaded with useful parts.

- Two 3.5 octave keyboards
- A 1 octave bass pedal assembly
- Lots of control switches
- Spring reverb
- Volume pedal
- amplifier w speaker
- Furniture grade sides and top

Primarily, I'm looking for piano keyboard assemblies, the rest is bonus.

I've been taking photos. I'll get those pictures up shortly.

The keyboards, unfortunately, do not have a separate switch/key, they are wired in a matrix. The C-64/Cynthcart project requires a different matrix encoding, so the existing switches are not usable.

Fortunately, the switch mechanism is not recessed like in the gutted Oxygen 8 keyboard I started with, so replacing the switches should not be too difficult.

Another lucky break...these keyboards were designed to be easily adapted to different lengths, so creating a mechanically sound 2 octave keyboard should be pretty easy.

Music keyboards for the C-64 and Cynthcart

I've been playing with Paul Slocum's Cynthcart software for the C-64 :

http://www.qotile.net/cynthcart.html

The software is fun, but the interface leaves much to be desired. I would prefer a labeled control panel and a real piano keyboard. Of course, there are some complicating factors.

First, the switches on commercial music keyboards are matrixed completely differently than the C-64 keyboard.

See this diagram :

http://www.doepfer.de/DIY/Matrix_25.gif

This requires a complete rewiring of the keyboard. I tried to rewire one of these by hand, and it was a disaster. Consumer grade circuit boards were not designed to be modified. They fall apart. PC traces come off the board, etc.

The plan now is to build a panel to hold 25 micro switches, and I will wire the switches by hand. If I wanted to build just one of these, I would hack it out, but this may be more universally useful, so I'm considering designing a panel that would be cut on a laser cutter, with holes for the switches. I can then wire the switches however I wish.