Spendor Prelude repair Qs

[Public Image Ltd]

A few questions about repairing/upgrading some Spendor Preludes. The
main problem is that both tweeters (Audax HD12X9D25 domes) have blown,
so the obvious question is whether to repair or replace those? In
theory, all it involves is finding the short in a wire coil. In
practice, the circuit is partially embedded in plastic, and the job
would involve a microscope plus some ultra fine soldering. I can't seem
to find any local replacement prices on the net - anyone got more info
to help the decision?

Secondly, the crossover is begging to lose those electrolytic caps and
iron-core inductors. Problem: I can't see any inductance values. Does
anyone possibly have the Xover design at their fingertips, or
alternatively can someone tell me what is involved in measuring
inductance? I am also slightly mystified that one of the inductors has
three lines out - can anyone explain how that works (could one line
possibly be a shunt from input to output)? Lastly, one cap doesn't
match exactly on each channel, with one side using 4.7 mFD in
comparison to 5 mFD on the other. What are the odds of this being an
intentional design feature rather than corner-cutting?
Ta in advance for any help.

[Trevor Wilson]

----- Original Message -----
From: "Public Image Ltd" <***@yahoo.com.au>
Newsgroups: aus.hi-fi
Sent: Thursday, January 13, 2005 7:47 PM
Subject: Spendor Prelude repair Qs

Post by Public Image Ltd
A few questions about repairing/upgrading some Spendor Preludes. The
main problem is that both tweeters (Audax HD12X9D25 domes) have blown,
so the obvious question is whether to repair or replace those? In
theory, all it involves is finding the short in a wire coil. In
practice, the circuit is partially embedded in plastic, and the job
would involve a microscope plus some ultra fine soldering. I can't seem
to find any local replacement prices on the net - anyone got more info
to help the decision?

**Tough call. I would approach the Spendor distributors, first. Failing
that, you may be able to locate someone who can repair the voice coil.

Post by Public Image Ltd
Secondly, the crossover is begging to lose those electrolytic caps and
iron-core inductors. Problem: I can't see any inductance values. Does
anyone possibly have the Xover design at their fingertips, or
alternatively can someone tell me what is involved in measuring
inductance?

**You need a multimeter which can measure inductance. You MUST also measure
the resistance of the coil and instruct the coil winder to make a coil with
the same inductance and resistance.

I am also slightly mystified that one of the inductors has

Post by Public Image Ltd
three lines out - can anyone explain how that works (could one line
possibly be a shunt from input to output)?

**There are several possible reasons for this. All are slightly unusual, but
certainly not rare.

Lastly, one cap doesn't

Post by Public Image Ltd
match exactly on each channel, with one side using 4.7 mFD in
comparison to 5 mFD on the other. What are the odds of this being an
intentional design feature rather than corner-cutting?

**Neither. In the capacitor world, 4.7uF and 5uF are interchangable. Given
that the tolerances applied to bipolar electorlytic caps is normally around
+/- 20%, you'll see that the difference is utterly insignificant. BTW: 4.7uF
is the preferred value to use.

Trevor Wilson
www.rageaudio.com.au

[Trevor Lees]

I did have some Audax replacement domes (I may still have some,out back)but
sometimes the repair is easier since the wire breaks in the vc gap so
unwinding a turn and resoldering is posible,we can check that...caps are
easy to measure and so are inductors with our meter,

cheers Trevor Lees

Melbourne,

PS hand wound air colis sound best..!

Post by Public Image Ltd
A few questions about repairing/upgrading some Spendor Preludes. The
main problem is that both tweeters (Audax HD12X9D25 domes) have blown,
so the obvious question is whether to repair or replace those? In
theory, all it involves is finding the short in a wire coil. In
practice, the circuit is partially embedded in plastic, and the job
would involve a microscope plus some ultra fine soldering. I can't seem
to find any local replacement prices on the net - anyone got more info
to help the decision?
Secondly, the crossover is begging to lose those electrolytic caps and
iron-core inductors. Problem: I can't see any inductance values. Does
anyone possibly have the Xover design at their fingertips, or
alternatively can someone tell me what is involved in measuring
inductance? I am also slightly mystified that one of the inductors has
three lines out - can anyone explain how that works (could one line
possibly be a shunt from input to output)? Lastly, one cap doesn't
match exactly on each channel, with one side using 4.7 mFD in
comparison to 5 mFD on the other. What are the odds of this being an
intentional design feature rather than corner-cutting?
Ta in advance for any help.

[Phil Allison]

"Public Image Ltd"

Post by Public Image Ltd
A few questions about repairing/upgrading some Spendor Preludes. The
main problem is that both tweeters (Audax HD12X9D25 domes) have blown,
so the obvious question is whether to repair or replace those? In
theory, all it involves is finding the short in a wire coil. In
practice, the circuit is partially embedded in plastic, and the job
would involve a microscope plus some ultra fine soldering. I can't seem
to find any local replacement prices on the net - anyone got more info
to help the decision?

** Go see a speaker repairer - dickhead.

Post by Public Image Ltd
Secondly, the crossover is begging to lose those electrolytic caps and
iron-core inductors. Problem: I can't see any inductance values. Does
anyone possibly have the Xover design at their fingertips, or
alternatively can someone tell me what is involved in measuring
inductance?

** Go see a speaker repairer - dickhead

Post by Public Image Ltd
I am also slightly mystified that one of the inductors has
three lines out - can anyone explain how that works (could one line
possibly be a shunt from input to output)? Lastly, one cap doesn't
match exactly on each channel, with one side using 4.7 mFD in
comparison to 5 mFD on the other. What are the odds of this being an
intentional design feature rather than corner-cutting?
Ta in advance for any help.

** Go see a speaker repairer - dickhead.

Obviously the owners of SMALL Spendors are NOT big spendors !!

More like tight arsed little shits.




........... Phil

[Public Image Ltd]

Post by Phil Allison
** Go see a speaker repairer - dickhead.
Obviously the owners of SMALL Spendors are NOT big spendors !!
More like tight arsed little shits.

A follow-up on my Spendor repair Qs. Audax don't do retail anymore. I
wound up dropping the tweeters into one of the main Melbourne Spendor
retailers, supposedly for a quote. I next got a phone call back saying
the job was done, and they wanted $330- for the repair two voice calls.
At that point, I started mentally computing the cost of two new
Scanspeak or equivalent drivers, and didn't particularly like the
results. The advice was that only the original Audax drivers would do
or the speakers would never be the same again, etc. I have my doubts -
the crossover point isn't particularly low and the driver sensitivity
isn't anything special. Have I been had?

[atec]

Post by Public Image Ltd

Post by Phil Allison
** Go see a speaker repairer - dickhead.
Obviously the owners of SMALL Spendors are NOT big spendors !!
More like tight arsed little shits.

A follow-up on my Spendor repair Qs. Audax don't do retail anymore. I
wound up dropping the tweeters into one of the main Melbourne Spendor
retailers, supposedly for a quote. I next got a phone call back saying
the job was done, and they wanted $330- for the repair two voice calls.
At that point, I started mentally computing the cost of two new
Scanspeak or equivalent drivers, and didn't particularly like the
results. The advice was that only the original Audax drivers would do
or the speakers would never be the same again, etc. I have my doubts -
the crossover point isn't particularly low and the driver sensitivity
isn't anything special. Have I been had?

Not looking good .