Topics

Telequipment scopes


Red Tomato <feolfo@...>
 

Hi there,

This might be a bit offtopic since I'm bringing
Telequipment scopes to
discussion. But then again Telequipment was bought by
Tektronix in the late
60's I think, so I hope all is well :-)

As I said I own two Telequipment scopes (bought them
for 30 pounds), models
D43 and DM53A with the following problems:

a)D43: Although I have both beams on the crt and the
timebase seems to be
working ok, I have neither focus nor any signal at all
(ie just two thick
straight beams);

b)Lots of trigger misfires. The signal "wanders"
across the crt window. Trigger level looks ok though.
Timebase looks ok;

Can you guys advise me on what to do or where to
start? Both crt's look ok
(no burnt spots, etc) - I'm sure we're talking about
minor stuff here.

Both scopes seem to be built like a tank - the quality
of wiring is superb -
and there's life in them - it would be a shame to
scrap them just like that.

Thanks in advance for all your
comments/suggestions/tips

Best Regards

Fernando Fonseca
Portsmouth, UK.
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John Lennon's dead. Phil Collins alive?!
----------------------------------------




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Don Black <jeans@...>
 

Hi Fernando,
Check the power supplies in the D43. It sounds like
something common to both the deflection circuits and beam voltages. It seems
the horizontal circuits are working (assuming you're seeing straight
horizontal lines). It could also be a vertical amplifier problem, not passing
a signal but either having hum signal or oscillation causing the line to
thicken. Try different sweep speeds to see if it's some signal causing the
line to thicken.
The DM53A must have a problem in the trigger circuit. Have you tried an
external trigger to see if it's lack of internal trigger signal? It must be
getting lost somewhere there.
Don Black.

Red Tomato wrote:

Hi there,

This might be a bit offtopic since I'm bringing
Telequipment scopes to
discussion. But then again Telequipment was bought by
Tektronix in the late
60's I think, so I hope all is well :-)

As I said I own two Telequipment scopes (bought them
for 30 pounds), models
D43 and DM53A with the following problems:

a)D43: Although I have both beams on the crt and the
timebase seems to be
working ok, I have neither focus nor any signal at all
(ie just two thick
straight beams);

b)Lots of trigger misfires. The signal "wanders"
across the crt window. Trigger level looks ok though.
Timebase looks ok;

Can you guys advise me on what to do or where to
start? Both crt's look ok
(no burnt spots, etc) - I'm sure we're talking about
minor stuff here.

Both scopes seem to be built like a tank - the quality
of wiring is superb -
and there's life in them - it would be a shame to
scrap them just like that.

Thanks in advance for all your
comments/suggestions/tips

Best Regards

Fernando Fonseca
Portsmouth, UK.
----------------------------------------
John Lennon's dead. Phil Collins alive?!
----------------------------------------

____________________________________________________________
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Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk
or your free @yahoo.ie address at http://mail.yahoo.ie

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