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The Currawong - Silicon Chip's hybrid amplifier
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Return to top of page · Post #: 31 · Written at 1:12:39 AM on 9 December 2014.
	Art Location: Somewhere, USA Member since 22 October 2013 Member #: 1437 Postcount: 896
I have only heard about it, but from multiple sources now. What I'm trying to say is I think it's more the guitarist crowd that would feel the benefit of the way valves break up "musically" over solid state clipping. The typical valve radio or music buff I imagine wouldn't be driving their amps that hard. If you Google image search "valve amp even harmonics" this is your first result: http://www.guitar-list.com/files/u1/harmonic-distortion-graph.jpg. You can tell that 1kHz test tone is the fundamental which is identical level on both amps. A proper demonstration would require a bit more data of course, but some digging would find it.

Return to top of page · Post #: 32 · Written at 1:58:57 PM on 14 February 2015.
	Brad Administrator Location: Naremburn, NSW Member since 15 November 2005 Member #: 1 Postcount: 7300
It's not breaking news, though the Currawong Amplifier kit is now being advertised by Altronics for $650.00. A big portion of the price will be for the eight valves though it is not a stopper for me. In due course I will be looking forward to building this and then making a set of speakers for it. Did AWV make 6L6s and 12AX7s? If so the addition of some NOS Super Radiotrons would be a nice touch. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ A valve a day keeps the transistor away...

Return to top of page · Post #: 33 · Written at 4:22:34 PM on 14 February 2015.
	MonochromeTV Location: Melbourne, VIC Member since 20 September 2011 Member #: 1009 Postcount: 1182
AWV did make locally 12AX7s, but not 6L6's. 6L6's were not made in this country & it is likely AWV would've imported US made RCA 6L6 types.

Return to top of page · Post #: 34 · Written at 1:32:21 PM on 18 March 2015.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6686
Silicon Chip has published notes and errata for the 'Currwong' in the March issue.

Return to top of page · Post #: 35 · Written at 1:29:50 PM on 30 May 2015.
	Garyoz Location: Perth, WA Member since 19 November 2008 Member #: 381 Postcount: 240
Just finished mine and it works great, timber is WA sheoak.

Return to top of page · Post #: 36 · Written at 8:52:23 PM on 9 October 2016.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6686
Nice job Garyoz. Just a note to say that Silicon Chip has published in the October 2016 issue a revised power supply using a single toroidal transformer in place of the two in the original design (one of which has been discontinued). The new transformer is Altronics MA5399: 230V 160VA 2 x 115V 0.5A 2 x 6.3V 1A 1 x 12.6V 2A

Return to top of page · Post #: 37 · Written at 10:28:57 PM on 9 October 2016.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5254
I note that after using one in an 11-20 that Jaycar have discontinued AS-3010 5" speaker which was a drop in fit for 11-20 and others. Transformer ended op inside the pan. If you could salvage the transformer out of one of those old Philips line Amps with 6CM5's & more than two of them, that would save. I have one with two of them & with what it's capable of running, its a savage beast. The 6CM5's can draw 100mA each max 300V plate (class B) Whilst not the wattage there is a 6BM8 data sheet with a circuit with no OP transformer.

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