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Return to top of page · Post #: 1 · Written at 6:47:05 PM on 6 December 2015.
	Redxm Location: Tamworth, NSW Member since 6 April 2012 Member #: 1126 Postcount: 471
I'm looking for a power transformer to suit a sig gen I'm repairing. Needs to be 240v primary with a 120v and 6.3v secondaries. The smaller the better size wise as there isn't a lot of room, but I'm sure I can make something fit. Thanks Ben

Return to top of page · Post #: 2 · Written at 11:22:16 PM on 6 December 2015.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5605
That sounds like a Tech TED-20 or an LSG-11. If it has a cap on the primary to cabinet? Get rid if it & earth the metal cabinet. Fitting that cap makes them intrinsically unsafe. Don't know how they got into the country like that? I after selling one LSG-11 , ended up with another LSG-11 ...New tubes (refurbished) all the same bad habits as the TED-20 & the other one (virtually same circuit). I don't need 3 Sig Gens.

Return to top of page · Post #: 3 · Written at 7:19:58 AM on 7 December 2015.
	Redxm Location: Tamworth, NSW Member since 6 April 2012 Member #: 1126 Postcount: 471
Marc Its an Advance B2, and the cap was the first to go. Ben

Return to top of page · Post #: 4 · Written at 9:41:51 PM on 7 December 2015.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5605
According to the circuit diagram the rectifier is a 6X5 fed by a 250 - 0 - 250 V secondary transformer Is this it? http://www.kevinchant.com/uploads/7/1/0/8/7108231/advance_signal_generator_type_b4.pdf What's wrong with the one in it? Circuit shows two dangerous line caps, better chance of it getting the operator. Marc

Return to top of page · Post #: 5 · Written at 7:40:37 AM on 8 December 2015.
	Redxm Location: Tamworth, NSW Member since 6 April 2012 Member #: 1126 Postcount: 471
Marc, that circuit is not the one I have. Its half wave rectified 120volts. (1 Diode) The transformer is open on both secondary windings. I have a circuit on paper but I cant find an electronic copy on my PC Ben

Return to top of page · Post #: 6 · Written at 9:16:39 AM on 8 December 2015.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5605
What valves 6AR5, 12BH7 ? I find it very odd that both windings are open, the heater windings tend to be fairly robust, unless it has melted down. If ithas a single valve I wonder if it is not a 62 Marc

Return to top of page · Post #: 7 · Written at 2:24:54 PM on 9 December 2015.
	Redxm Location: Tamworth, NSW Member since 6 April 2012 Member #: 1126 Postcount: 471
Marc Yes its a 62, typo on my behalf. It uses 12AT7. And yes, both windings are open, it doesnt look like its been overheated but who knows what its past is. Ben

Return to top of page · Post #: 8 · Written at 11:33:10 AM on 8 January 2016.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2642
Could you fit 2 small readily-available transformers? http://www.altronics.com.au/transformers/ei-core-transformers/ 240v to 12.6v CT 500mA (CT gives 6.3v) - Altronics M2853L 240v to 30v 150mA - Altronics M2855L. Use a full-wave voltage doubler (2 diodes, 2 caps) to get about 90 v. DC from the M2855L. This may well be not much less than the half-wave rectifier originally gave. If that's not enough (it should be) then use a voltage tripler for 135v. If you need a schematic, let me know. Ian

Return to top of page · Post #: 9 · Written at 5:25:23 PM on 8 January 2016.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6887
Hammond should have something suitable, but the dollar isn't favourable. Alternatively, a rewind may be economical: http://www.transformerrewind.com.au/

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