DIY Rega arm conversion kits
| SERVICE NOTES - maintenence and setup | ARM IDENTIFICATION - serial numbers, used arms, arm series |
| DOWNLOADS - dimensions, templates, manuals |

Service notes

Cleaning
Finger marks can be cleaned using liquid lighter fluid (note: inflammable).
Brass and stainless steel counterweights can be polished using commercial metal polish. Don’t use abrasives on gold plated counterweights.

Counterweights
The counterweights before 2014 are secured by the inset nylon screw. Use a small flat-blade screwdriver to tighten it. Only tighten the screw very gently. Very little pressure is needed to hold the counterweight in place.

Later and current versions (after s/n 700) use a nylon-tipped screw with 2mm allen head. The key from the antiskate quadrant fits this.

We can modify early counterweights to use the current lock screw.

Counterweight won’t fit onto shaft.
NEVER force the counterweight if it is not free on the shaft.
NEVER twist the counterweight on the shaft.
1 Check that the locking screw is loosened.
2 The counterweight is made up of several layers. If the weight has been dropped or knocked they may be out of alignment.
To rectify, loosen the three cap head screws holding the counterweight together by 2-3 turns (2.5mm allen key), then slide the counterweight onto the shaft to align the elements and tighten the screws.

Arm lift
The height of the arm lift can be adjusted by loosening the grub screw inset into the black plastic lift platform. (1.3mm allen key). Check the vta setting carefully before adjusting the arm lift, it is set correctly when the vta is right.

Series Five arm after 2015 with the alloy arm lift platform use an m1.5mm allen key.

Alloy arm lift platforms aren't compatible with earlier arms.

Wiring
NEVER twist the signal wires together at the headshell.
Only add/remove the tags from the cartridge by holding the tags, never pull the wires.
NEVER pull the interconnect cable, only the plugs. If the plug moves on the cable, the loom will fail.
NEVER attempt to disturb or change the RCA plugs of silver looms. The signal wires are in one run from the cartridge tags and the wire dressing is critical to within 1-2mm. Any attempt to disturb the plugs will result in a failed loom inside the arm.

Arm mounting
Tightness of the securing nut is not critical. It is generally only necessary to tighten it enough to stop the am fom turning.
Threaded arm mountings
Some mountings (usually built-in vtas) have a threaded base. Take extreme care with aluminium or anodised bases. You MUST lubricate the threads before screwing the arm into one or the two may lock solidly together. Test-assemble and if the thread appears tight, stop immediately.

VTA locks
Stainless steel vta locks
before 2014 have a small acrylic piston inside. This can drop out if the arm is removed from the base, or can be crushed if the lock is tightened too much. There is a spare in the “spare parts” kit included with the arm. On current arms the lock uses a copper piston.
To remove a crushed vta lock piston:
Standard arms: slide the arm out of the base and push the lock out using a pin 3mm or smaller. This can be done with the arm in place on the arm board.
Micrometer arms: Remove the arm from the arm board. Remove the screw from the tip of the micrometer (2mm allen key). The base can now be slid out of the base and the piston removed as above.
Nylon (screw type) vta locks.
If the screw does not hold securely, change it for one from the “spare parts” pack. Don’t overtighten the screw.
Nylon finger locks
Don’t overtighten. Very light pressure will secure the arm.

Early (nylon screw) vta locks can be updated to the current stainless steel version.

Antiskate weight
The weight is secured by a small, split lead disc inside. Slide the disc up or down the thread to adjust the height of the weight. If the sisc slips on the thread, squeeze it gently with small pliers to tighten it. There are extra discs in the “spare parts” pack.
Don’t cut the thread short. Having it touch the arm board will stop it swinging.

Very early weights may be of brass or stainless steel and too heavy. The current aluminium one can be fitted.

Headshell shims
To test the effect of a headshell shim, attach it temporarily to the top of the headsehll with a spot of “Blu-Tak” (reset the tracking force) to do A/B comparisons. When the correct shim is found, fit it permanently between headshell and cartridge.

Thread sizes
Metric sizes are used throughout. Arms and kits after Serial 250 have a "spare parts" pack containing spares of the fixings likely to be lost.
Sizes: Arm yoke cap screw: M2, stainless vta lock and counterweight stub: M4, all others M3. Counterweight lock screw up to s/n 700: M3, after 700, M4.
Counterweight body screws, M3 (2.5mm allen key).

 

 

 


Arm identification

Arm serial numbers
Download this csv file to identify an arm by serial number.
The file can be opened into any spreadsheet/database application
Contents: Serial number-date-type-finish

NOTE: Buying a use kit arm.  The arm may give perfectly good service but check carefully the standard of finish and wiring. The price should reflect a tonearm arm built from an Audiomods kit, rather than an Audiomods arm. Most kits will have 3rd party or DIY wiring installed.

Early arms
Up to June 2009, s/n before 53
Special exchange upgrades are available for original owners of arms before s/n 53

Series III arms
After June 2009 s/n above 53. Revised micrometer base, wooden box, 251 arm tube, silver wiring loom
Series III specifications
Update: Can be updated to Series IV specification. Small micrometer kit and alloy arm rest available for diy fit.

Series IV arms
After July 2010 s/n above 140. New bearings, stainless steel vta lock, alloy arm rest, small micrometer, dual counterweights, headshell shim set. Matt finish to special order.
Series IV specifications
Update: Service overhaul and update with Series Five horizontal bearing.

Series Five arms
Current model from February 2012, after s/n 375. New bridged arm yoke and bearings, new generation 303 arm tube, matt or polished finish.
Series Five specification

Series Five Evolution
Summer 2014: Variable mass counterweight with copper fill discs. Copper vta piston replaces acrylic.
Spring 2015: Alloy arm lift platform replaces Rega original.
Autumn 2015: Headshell damping for 303 arm tube.
Spring 2016: New extra-low-friction bearings in base.
Autumn 2016: Viscous damping for micrometer base, KLE bullet RCAs standard fit.

Downloads

Downloads
Mounting template
Standard arm dimensions
Micrometer arm dimensions
Cartridge choice


Series Five owner manual
Classic owner manual

Kit assembly instructions

 

 


August 2016 contact: jeff@audiomods.co.uk

5 Tormore Mews, Rectory Road, Deal, Kent CT14 9SX United Kingdom
Tel: +44(0)1304 379698
.