Tech_Notes_-_Reverb_Pan_Mounting.pdf

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TECH NOTES

Fender Musical Instruments Corp.

7975 North Hayden Road Scottsdale, Arizona 85258

TECH NOTE #

TN 98-2

ISSUE DATE:

ISSUED BY:

PAGE:

May, 1998

J. Benson

1 of 2

PRODUCT(S) AFFECTED:

ALL AMPLIFIERS WITH SPRING REVERB

GENERAL GUIDELINES FOR REVERB PAN PLACEMENT / MOUNTING:

CONDITION:

The placement of the reverb pan in Fender amplifiers has already been optimized in

each product, but on occasion someone has moved the pan, forgot to take note of it's

orientation prior to removing, or is having complaints about a low-level hum that goes

up and down with the turning of the

Reverb Control.

GENERAL MOUNTING PHILOSOPHY:

Low-level hum can be picked up by the output section of the reverb pan - by it's

proximity to the power transformer. The ideal mounting for the pan is to position it as

far as possible from the power transformer, with the output jack (of the pan) farthest

from the transformer. In most amps, this translates to the bottom of the cabinet, with

the open side down, and jacks facing the front of the amp. There are a few exceptions

to this rule - they will be addressed later.

Some pans are placed in bags, and the bags are then mounted with screws to the

bottom of the cabinet (this is to avoid a firm mounting, which can sometimes produce

strange oscillations). Other pans are screwed directly to the cabinet (loosely) - a rule of

thumb is to tighten the screws to the point where the play in the mounting just

disappears, then back off to create the smallest amount of play (actual dimension is not

critical, but is approximately .010").

Hint: "howling" can sometimes be fixed by

loosening the pan mounting.

TECH NOTE # TN98-2

PAGE:

2 OF 2

GENERAL MOUNTING PHILOSOPHY (CONT)

In order to optimize the mounting of pans, the mounting springs for the internal floating

platform are chosen to provide the correct platform floatation for the actual orientation

of the pan mounting, i.e. open side down, open side up, mounted vertically with jacks

up, mounted vertically with jacks down, mounted with input end up, mounted with output

end up, etc. (Please see mounting plane chart).

When the pan is mounted in such a way as to cause the jacks to be near a cabinet

surface or member, it is important to leave room enough to allow plugging-in and

unplugging the leads

EXCEPTIONS:

The following list indicates reverb pans which

do not

mount horizontal open side down:

PART NO.

031669

040403

028592

033542

047604

051730

041397

MOUNTING PLANE

VERTICAL - CONNECTORS DOWN

HORIZONTAL - OPEN SIDE UP

VERTICAL - CONNECTORS DOWN

VERTICAL - CONNECTORS UP

HORIZONTAL - OPEN SIDE UP

Tech_Notes_-_Reverb_Pan_Mounting.pdf

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