For the Rev 2:

Upgrade the EPROMS & power supply-- transfer the operating system to 2716 EPROMS, eliminating the need for -5 and +12 supplies. Improved heatsinking of regulators.  This results in a more reliable power supply with less chance of lockup.

$60 parts and labor.

RAM Replacement for Rev 2 & Rev 3.0 -- the Rev 2 & 3.0 use eight 6508 RAM ICs for patch memory.  These are increasingly hard to find, and expensive ($15 each). This new board replaces the 6508s with two 6514s.  On the 3.0, it's plug and play;  Rev 2 installation requires one cut and one jumper on the CPU board.

 $50

Cassette Interface -- upgrades the operating system & adds IN and OUT jacks for loading & saving programs.

$75 parts and labor

For the Rev 3:

Rev 3.0 -- Upgrade the EPROMS & power supply-- transfer the operating system to 2716 EPROMS, eliminating the need for -5 and +12 supplies. Improved heatsinking of regulators.  This results in a more reliable power supply with less chance of lockup.

$60 parts and labor.

Memory Upgrade for 3.2-- upgrade to version 3.3, which adds memory for two more 40-program banks (120 programs total)

$75 parts and labor.

MIDI Interface for revs 3.2 and 3.3-- The original Sequential Circuits board, with simplified mounting.  Send & receive in Poly or Omni mode on your choice of 16 channels;  program change;  pitch wheel receive;  sysex load & save of patch data.

$175 parts and labor.

____

MIDI Firmware Upgrade for P5 rev 3.3

New features include activity monitor, tuning progress display, unison modes & unison detune, sysex save of one or all 120 patches now compatible with standard MIDI patch librarians, and more.  Details at http://www.tauntek.com/V10pt6instrs.pdf

$100

MIDI Firmware Upgrade for Prophet 10

Makes sysex patch saving compatible with standard patch librarians, eliminating need for the unreliable onboard cassette unit.

$50

Transformer Replacement-- for any revision.

Older transformers can have an annoying hum;  they can be replaced with a new torroidal hum-free transformer.

$100 parts and labor.

Keyboard bushing replacement

For any j-wire keyboard;  improved key feel & quieter action.

$100 parts and labor for 61 note keyboard.

$60 parts and labor for 37 note keyboard.

Detatchable Power Cord

Add standard 3-conductor socket & 8 foot cord to older synths like the Pro-One,        P5 rev 2, etc.   

$25

I also install Kenton and Encore MIDI kits.  Average cost of installation is $100, depending on the time required and complexity of the install.  Contact me for details.