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Help needed sourcing U.H.F. mixer diode
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Return to top of page · Post #: 1 · Written at 11:03:14 AM on 29 November 2022.
	Labrat Location: Penrith, NSW Member since 7 April 2012 Member #: 1128 Postcount: 403
Hi Folks. I have finally found out, what else, is wrong with the U.H.F rotary tuner in the Kriesler 59-01 television I'm working on. From the damage I've found so far, it looks as though this set has had a close encounter with lightning. Probably a proximity strike. Anyway I found the mixer diode to measure five ohms in each direction. Another tuner I have here, its mixer diode measures a bit better.. Akin to a leaky diode. My last tuner, its diode measures good, although there is a short in the rotor/stator to be fixed. What I need. A source of SD82A or 1S750 diodes. Equivalents, haven't been able to find any. Research seems to indicate that Schottky diodes are now the go. Surface mount diodes are not suitable as there are no radial leads to act as the input and output coils. If you know a source of these diodes or an equivalent, please advise. Wayne. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ I love the smell of ozone in the morning.

Return to top of page · Post #: 2 · Written at 3:46:52 PM on 29 November 2022.
	Labrat Location: Penrith, NSW Member since 7 April 2012 Member #: 1128 Postcount: 403
More research . A, 1SS -16 will do and probably a Phillips BA481, although its leads will need to be lengthened. Wayne. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ I love the smell of ozone in the morning.

Return to top of page · Post #: 3 · Written at 10:12:26 AM on 30 November 2022.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2667
Did you try WES? A 59-01 with a rotary UHF tuner? Now THAT'S a rare bird! Don't recall ever seeing one, and I did warranty service on them....

Return to top of page · Post #: 4 · Written at 11:07:45 AM on 3 December 2022.
	Labrat Location: Penrith, NSW Member since 7 April 2012 Member #: 1128 Postcount: 403
Hello All. I have managed to find some 1SS86 diodes in China. Have ordered them and they ought to be here sometime in the next four to five weeks. Being so small there can be no markings on the diodes, I will not know whether or not they are the genuine article until fitted in the tuner. Wish me luck.. Wayne. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ I love the smell of ozone in the morning.

Return to top of page · Post #: 5 · Written at 3:56:23 PM on 28 December 2022.
	Morren Location: Killarney Vale, NSW Member since 19 March 2012 Member #: 1112 Postcount: 25
Thanks Wayne! It looks like the UHF is being a bugger. Glad you found some from O/S

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