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Need circuit for Tecnico 1050
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Return to top of page · Post #: 1 · Written at 7:27:44 PM on 12 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Got a Tecnico 1050 radio. Like this one http://www.radiomuseum.org/r/tecnico_aristocrat_1050.html. If anyone have the circuits for it and could email it to me, it would be greatly appreciated.

Return to top of page · Post #: 2 · Written at 9:29:00 PM on 12 July 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
Use Control Panel to unhide your email address and I'll send it to you.

Return to top of page · Post #: 3 · Written at 10:21:47 PM on 12 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Thanks GTC, UNHIDE NOW.

Return to top of page · Post #: 4 · Written at 2:28:24 PM on 13 July 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
Okay, sent.

Return to top of page · Post #: 5 · Written at 3:18:43 PM on 13 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Thanks GTC, appreciate it.

Return to top of page · Post #: 6 · Written at 9:56:23 PM on 14 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Got the schematics from GTC, thanks. However, I have another related question. There are no voltages for plate and grid, how can I figure out the correct ones?

Return to top of page · Post #: 7 · Written at 10:13:48 PM on 14 July 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
I don't have the voltage table for that model. As a guide, I'd look up the characteristics for each valve. One source is Frank's pages: http://frank.pocnet.net/.

Return to top of page · Post #: 8 · Written at 10:12:52 AM on 15 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
I suppose when working with older radios, it is normal to have less info available. Just need more investigation.

Return to top of page · Post #: 9 · Written at 10:42:10 PM on 15 July 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
Depends on what the various manufacturers made available for their models. Some schematics and associated service notes are very detailed. Others less so.

Return to top of page · Post #: 10 · Written at 3:19:52 PM on 16 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
The choke is rated as 14H 60mA, does this means the total HT current draw should be less than 60mA?

Return to top of page · Post #: 11 · Written at 5:18:04 PM on 16 July 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
The specs for a choke coil normally include the max DC current permissible. In your case it's 60mA.

Return to top of page · Post #: 12 · Written at 8:19:41 PM on 16 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Check the valves data sheet, the total current draw of the first three valves is about 25mA, so that's only 35mA left for the 6V6. According to its data sheet, it need to work at 180V to use 35mA. So I guess the HT should be about 180v. Sounds a bit low, what am I missing here?

Return to top of page · Post #: 13 · Written at 8:23:27 PM on 16 July 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
The R9 is 15 ohm and I think it is the back bias resistor for the first three valves. 60mA will only give about 0.9v bias, also a bit low?

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