WTD Mission cambridge amplifier
 

L.S.
I am looking for a mission Cambridge schematic or service doc.
The problem is every few seconds a huge TICK sound in the speakers.
I thought it was a malfunctioning ELCO but all are ok.
So i am in the blind now, any one with a sugestion please do mail me.

remove -no-spam- from the e-mail address.
TnX in advance

--
# A brain storm to one person could be a slight draft to the other one.
# Cees Keyer, Amsterdam school of technology (change -at- in @ in E)
# dept. Electronic Engineering, Weesperzijde 190, 1097DZ Amsterdam, NL
# pe1jmj-at-amsat.org Voice: (+31)20-5951639, Fax: (+31)20-5951420

"Cees Keyer" bravely wrote to "All" (17 Aug 05 09:41:56)
--- on the heady topic of "WTD Mission cambridge amplifier"

A periodic click may be an intermittant oscillation whenever the
output stage clips or reaches some threshold value but perhaps it may
be a speaker problem, have you tried testing them?

An oscillation is often due to a marginal bypassing or poor supply
regulation. Sometimes the feedback loop is involved in combination
with an highly capacitive speaker load. For instance some fat
specially speaker cables are known to introduce enough capacitance to
make some amplifier outputs unstable.

Alternately, a driver stage with weak gain may be saturating and
cutting off the feedback signal which might make the outputs hit the
rails and the click you hear.

Does the click happen at low listening levels or only at normal to
loud playing?

A*s*i*m*o*v


CK From: Cees Keyer
CK Xref: core-easynews sci.electronics.repair:339896

CK L.S.
CK I am looking for a mission Cambridge schematic or service doc.
CK The problem is every few seconds a huge TICK sound in the speakers.
CK I thought it was a malfunctioning ELCO but all are ok.
CK So i am in the blind now, any one with a sugestion please do mail me.

CK remove -no-spam- from the e-mail address.
CK TnX in advance

.... A stereo system is the altar to the god of music.