Electronics Forum / Repair / July 2010

Need info on the Advent Powered Louspeaker.
I used to have this stuff somewhere...
Thanks,
Mark Z.

Years ago (1980s?) I had a program from Motorola on 1.4" floppy that
would allow me to input a characteristic and the program would reply
with a list of transistors that matched. I have long since lost it...
Has anyone got a copy or know of something similar?  Motorola was

Owner of local high-end hifi store that I do some service work for, bought
these in with the surrounds rotted away on the bass drivers. Apparently,
these things were 8 grand apiece 12 years ago when new. He managed to get
some new cones / surrounds from the States somewhere for a ...

Picked this up a few months back and just hauled it out. The units
power up, and lights come on but the cassette deck stubbornly remains
dead.
This is a 'pseudo-separates' affair, where each box is connected by

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Ticking smps , caused by failing hot side electro on the supply V for the
switching ic driver. Uprated and smps is stable putting out right sorts of
higher DC , according to the schematics.
But the LV 3.3V etc regulators seem to be waiting for a control signal.

Goes into protect mode at switch on.
Useful info and schema on these G class amps
http://www.reptips.dk/Reptips/CAUDIO.pdf
as well as schema only, on e-service

Just in. A combo, the job ticket on which says "Low volume. Sounds like
sh.t."
There's hope for the lads behind the counter, yet. How nice to get one with
a perfect owner's description of the problem, rather than some wild guess

What do you call a Belling-Lee connector?
I know in the US they call them PAL connectors because PAL TVs sold by
grey market importers in the 1980s used them.
As a joke I have referred to the ones on US TVs as NTSC connectors. Just about

I'm trying to fix my '73 Zenith 25CC25. The problem is that the
horizontal sweep is not wide enough, so my picture is compressed
horizontally. I've lost about 10% of the width on each side. Other
than that, it's fine. I have both the Zenith service manual and the

I am having some problems with this 36" tv. Sometimes it will turn on
and sometimes it won`t. I had it on all day last Sunday and shut it
off
and the next day it would not turn on. It will make the usual

I have perhaps foolishly tackled the repair of my freeview box -
Tvonics MDR-250 - for which no service information appears to be
available.  I'm an amateur, btw. (Fault is it's powering on and
immediately shutting down repeatedly.)

I noticed the lithium battery for my nikon camera was acting as it it had
a bad cell. It would charge, but just not last very long. The battery is
"smart" with a third terminal that the camera talks to. It shows perfect
"health" which is total nonsense after 2 years of use and ...

I have a small stereo amplifier which came with two tiny 4ohm 3watt speakers.
I'd like to combine the two channels of the amp in order to drive one, slightly
larger, 8ohm 4watt speaker.
The amp is of the non-bridgeable type, so I assume parallel wiring would be

Bad splitter-driver  plate/anode 100K resistor, what goes bad with them?
Causing rustle noise in output. Partial crack? or something chemical. I may
as well replace the 82K while I'm at it , but is there any point to
pre-emptively replacing all the HV droppers ?