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 Kriesler Portable TV - anyone know where I can get a schematic? (Miniscope PT1 Chassis = 49-1)
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 Return to top of page · Post #: 1 · Written at 5:15:13 PM on 14 March 2019.
Gelogan's Gravatar
 Location: Mt Evelyn, VIC
 Member since 12 March 2019
 Member #: 2336
 Postcount: 2

Hi all,

After many years of restoring and aligning AM radio I though I'd have a go at bringing this little TV back to life. It looks to be in great physical condition and very much unmolested internally and would pretty cool running with my radio collection.

I think this dates back to the late 60's but really cant find much technical data for it and I'm loather to power it up until I can.

It's described as "This 28 cm B&W television receiver tuned the 13 standard Australian VHF channels. Tuner type Philips NT3017. Many of the transistors and diodes occur more than once - yes other than the CRT no valves so must be a really early all transistor (germanium I guess) set.

Thanks for any pointers where I might get access to some data for this thing?

regards

Glenn


 
 Return to top of page · Post #: 2 · Written at 5:22:25 AM on 15 March 2019.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 317

Hi Glen, welcome to the forum.
From memory the 49-1 was a very popular and reliable set.
First produced in around 1967, and apart from the CRT was entirely solid state using discreet silicon transistors.
They were so popular I think production lasted nearly two decades.
When I get a chance will dig around in my manuals and see if I can find a circuit for you.
JJ


 
 Return to top of page · Post #: 3 · Written at 12:03:13 PM on 15 March 2019.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1269

I have that schematic at home. I'll copy it out of the PDF tonight or tomorrow and mail it to you if your email address is unhidden.

I used to repair them under warranty. They were, as JJ said, very popular and reliable. Least reliable part? The lime green Shizuki yoke coupling caps. One of the few imported parts in those sets.

I wouldn't be at all concerned about powering it up. I bet it works too.

Early versions used Philips silicon metal can transistors like BC107, BC177 etc. Some later production used Anodeon (Astor) transistors for a while. Little black rectangular devices. These were less reliable.

The only germanium transistor was the horizontal output, AU103 or equivalent.


 
 Return to top of page · Post #: 4 · Written at 2:02:37 PM on 15 March 2019.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 317

Yes, I forgot about the germanium horizontal output transistor.
Also a reliable component, unless there were dry joints on the horizontal drive transformer.
Another Kriesler factory problem, caused by women assemblers sweaty fingers during a certain time in the month touching the pretinned drive transformer pins before being effectively soldered.
Then again that may have been another model, it’s a long time ago!
JJ


 
 Return to top of page · Post #: 5 · Written at 3:15:41 PM on 15 March 2019.
Gelogan's Gravatar
 Location: Mt Evelyn, VIC
 Member since 12 March 2019
 Member #: 2336
 Postcount: 2

Hi Ian & Johnny,

Thanks for welcome,

Any data would be greatly appreciated - I've jut un-hidden my email address so hopefully you can see it.

Looking inside it's definitely full of little tin can transistors. So that's good news.

There us one very crusty looking main filter cap (ends are all cracked but not physically leaking) so I'll plug it into the 12V and see how it goes and report back - luckily I still have a VCR to act as a video source.

Regards

Glenn

ps. My wife wasn't convinced about the sweaty hands!! Smile


 
 Return to top of page · Post #: 6 · Written at 4:10:11 PM on 15 March 2019.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1269

Circuit sent.

I heard that too, from Bruce Pinkerton. It's apocryphal.

Power supply problems in PT1s are rare. Just plug it into the mains in the normal way.


 
 Return to top of page · Post #: 7 · Written at 8:43:23 AM on 16 March 2019.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1269

Be aware that the PCB with its frame hinges down / out for easy access to both sides. It's not obvious that it does.

If your set has the little DY51 EHT rectifier valve it's an early one and the circuit I sent you will match. If it has a diode or selenium rectifier it's later production.

This little set was a big surprise coming as early as it did from a very conservative engineering team. It appeared at a time when everyone else except Pye were still using valves in their portable TVs.


 
 Return to top of page · Post #: 8 · Written at 7:42:47 AM on 18 March 2019.
Irext's avatar
 Location: Werribee South, VIC
 Member since 30 September 2016
 Member #: 1981
 Postcount: 179

I remember at around the same time both HMV and Astor did a solid state portable TV. Both of which were quite unreliable.
I remember repairing a HMV little Nipper portable which used to frequently take out the Germanium line output transistor (40440) if my memory serves.
The little Kriesler was a much better set.


 
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