Is there an update for my Model 8 amplifier? What is the difference between Model 8 and Model 8T?

Yes, all Model 8 amplifiers are eligible for update. Model 8 amplifiers with "Model 8T" nomenclature on the rear panel, serial numbers B80001 through B80055, are also eligible (See Stage 3 update below).

All update stages require that the amplifier be returned, in the original factory shipping case, to the Jeff Rowland Design Group factory. A return authorization number must be issued by JRDG which will indicate the date on which the unit may be shipped to the factory. Jeff Rowland Design Group will arrange the freight forwarding carrier and instructions for the most efficient, cost effective transit both to and from the JRDG factory. All shipping and related charges will be the responsibility of the end user and/or dealer/distributor.

Stage 1:

Model 8 amplifiers between serial numbers A80001 and A80102 may need additional work involving the replacement of power supply components before the unit can be eligible for the Stage 2 update. These units were originally designed with a single "choke-input" power supply which simultaneously powered both right and left channels. The Stage 1 update provides a "dual mono" power supply which consists of totally isolated right and left channel power supplies which allow completion of the Stage 2 update. Since many of the original Model 8 amplifiers (serial numbers A80001-A80102) have already been modified to this stage, it may be necessary to inspect the internal layout of the amplifier in question. Original, unmodified units can be identified by two large black capacitors placed longitudinally from the front to the rear of the amplifier. All modified units can be identified by four large black capacitors placed transversely and clamped between two gold-colored brackets which span the entire length of the amplifier.

Stage 2:

Update is available to all amplifiers from serial number A80001 through B80055. This update can be performed independently from any other update, i.e. A80234 does not require the rear panel with battery power supply connections to be eligible for the Stage 2 update; however, unless the amplifier has connections for use with the battery power supply, the unit will not be able to be used with the BPS-8 battery power supply at a future date.

This update involves minor modifications to each right and left channel main circuit boards and the replacement of each right and left channel plug-in modules.

This update provides the greatest sonic performance improvement possible without utilizing the BPS-8 option.

This update involves minor modifications to each right and left channel main circuit boards and the replacement of each right and left channel plug-in modules.

This update provides the greatest sonic performance improvement possible without utilizing the BPS-8 option.


Related Articles

Attachments

No attachments were found.

Visitor Comments

Article Details

Last Updated
2nd of August, 2010

Would you like to...

Print this page  Print this page

Email this page  Email this page

Post a comment  Post a comment

 Subscribe me

Subscribe me  Add to favorites

Remove Highlighting Remove Highlighting

Edit this Article

Quick Edit

Export to PDF


User Opinions



How would you rate this answer?




Thank you for rating this answer.

Continue