ARP 2500 upgrades and service


		Upgrades / Modifications for the ARP2500


	ARP 2500 AUDIO CLIPS Since the ARP 2500/2000 is so rare, here are some sound samples to illustrate this great sounding synthesizer. #1 - 2500 Duet in stereo - 2/10/06 This is a live cut - no overdubs. The thick bass sound is a 2515 main cabinet with 7 vco's. The surprisingly realistic piano sound is a 2508 wing cabinet with 3 vco's and 3 multimode filters. The controller was a Rhodes/ARP Chroma via a Kenton Pro-2. Ennio Morricone's - Once Upon a Time in the West This was quickly arranged on a PC using sonar. This uses the same 2500 patch as above. I added some 2600 percussive rhythms and a Roland 808. More sound clips to come ©2006 Phil Cirocco


	ARP 2500 RESOURCES This early version of the ARP 2500 was made in 1970 2500 Matrix Switch Color Code Running a ARP 2500 / 2000 from a MIDI converter

ARP 2500 UPGRADES AND MODIFICATIONS

2500 / 2000 SERIES CABINET UPGRADES

POWER SUPPLY UPGRADE -------------------------------------349.00

Much of the crosstalk in a stock 2500 is due to the age and configuration of the power supply, not due to the matrix switches! The power supply in your 2500 is about 27 to 33 years old. Linear power supplies have an average shelf / operating life of about 20 years. Chances are that your power supply is not up to spec. This can result in excessive noise, ripple, and instability rendering the instrument useless in a modern midi studio. To remedy this, we recommend the power supply upgrade. This mod replaces your unit with a high power, highly stable, military spec power unit with remote sense regulation. The overall sound quality, oscillator purity, stability and keyboard tracking are noticeably improved.

1000 SERIES MODULE UPGRADES

1005 MOD-AMP UPGRADE -----------------------------------------375.00

The balanced modulator of the 1005 only operates in the dc mode. This mod includes upgrading the audio path in the 1005, increasing slew rate and reducing noise, adding miniature AC/DC toggle switches for each audio input to the balanced modulator for a wider range of output waveforms. Adding a separate output for the balanced modulator and adding an additional audio input to the VCA section. Vastly improves the 1005 module functionality. Includes cap replacement and calibration. Now includes installation of a 1/8" auxiliary output jack on the back of the module for a low noise, direct connection to your mixer.

1006 FILT-AMP UPGRADE ------------------------------------------225.00

This upgrade includes increasing the filter headroom by a factor of 2. Improved noise and slew rate for the VCA section. Includes cap replacement and calibration. Now includes installation of a 1/8" auxiliary output jack on the back of the module for a low noise, direct connection to your mixer.

1047 MULTIMODE FILTER UPGRADE---------------------------479.00

The 1047 is a wonderful processor. However stock units are noisy, have quite a bit of control voltage feed-through (thump) and have limited headroom causing the unit to be easily overloaded. This extensive mod does 3 major things: We increase audio headroom by a factor of 2. We install shielded lines and reroute the input node structure to reduce input noise. We replace 2 of the 4005 OEM VCAs with custom made CMS 4005cx VCAs to eliminate any trace of thump in the audio chain. If the hiss and that damn overload light have been bugging you for years, this mod is for you. Includes cap replacement and calibration.

e-mail: filter@discretesynthesizers.com

phone: 610-694-8886