Re: LF: Re: 8.97kc - fuse for TV transformer

[Gary - G4WGT <g4wgt@tiscali.co.uk>]

Horst, LF,

I used TV line output transformer & scan coil yoke cores in my early days of LF 136 kHz operation. Of course the existing winding was removed & rewound to suit. Results were quite good at low to medium power.

73

Gary - G4WGT.

On 30 May 2010 12:36, Horst Stöcker <horst.stoecker@web.de> wrote:

The problem is the secondary winding, of course. My primary is just wound and will surely have survived when the seconary is "a molten blob".
Horst DO1KHS/DI2AN

-----Ursprüngliche Nachricht-----
Von: Dave Sergeant <dave@davesergeant.com>
Gesendet: 30.05.2010 13:21:34
An: rsgb_lf_group@blacksheep.org
Betreff: LF: Re: 8.97kc - fuse for TV transformer

>On 30 May 2010 at 12:28, Horst Stöcker wrote:
>
>> some minutes before it did a weak click. Shock: Have I blowen the TV
>> transformer. Good luck, it was just the fuse of my PA. No problem. But I
>> possibly should add a fuse to my TV transformer. Does anybody know how
>> many A the transformer will take? Horst DO1KHS/DI2AN
>
>It should be borne in mind that all these types of LOPT's are now
>antiques. Split Diode type line output transformers have been universal
>in TVs and monitors for the last 25-30 years. So you are really on your
>own as far as data or reliability are concerned.
>
>A normal TV LOPT will be working with a peak feed current to the
>primary of around 400mA. Anything more than that and you will soon have
>a molten blob. In the age when these kinds of transformers were used,
>usually with an external tripler, they were very much the weak link in
>sets and were failing all the time.
>
>73 Dave G3YMC
>
>http://www.davesergeant.com
>
>
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