Re: Dummy load , high power audio, add ons ?

N_Cook wrote:
50V , low wattage lamp (or seriesed lower V ones) (assuming normal testing
is 10 to 20W range) to visually show if the volume is set too high, also if
high level high f oscillation on the output; sacrificial, fusewise, if
overdriven.
AC voltmeter , preferably autoranging for possible overload situation, to
measure/long term monitor the RMS power.
High power speaker pot (plus droppers) leading to a low quality ,
sacrificial ( for intitial maybe problematic testing) small speaker, for
basic possible intermittant sound, on/off, indication. Can be switched out
by plugging in a good quality speaker for audio monitoring of quality of
sound issues in otherwise known good amp.
Provision for coupling in a scope for distortion monitoring, when necessary.
Any other add-ons that others know of ?

Mine is made from several lengths of electric fire bar 'tuned' to 8 ohms each bar. there`s a tap off via a three way speaker selector switch well resistored down to provide some monitoring using an external speaker. A couple of capacitors provides DC isolation.

I have one of those Velleman electronic VU meters hooked in which gives me a rough guide to the input power - the firebars can handle over a kilowatt, tho they do get pretty hot, the elements glow quite brightly at those sort of powers.

The front of the case has Speakon,jacks and binding posts.

Originally, I was going to install some kind of cooling fan driven from DC rectified from the input signal, but never got round to it.

Ron(UK)
.

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