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Calstan 801 info needed
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Return to top of page · Post #: 1 · Written at 2:23:06 PM on 31 August 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Hi, I got a radiogram and there is no brand on it. From the valves line up, I think it is Calstan 801. 6be6 6ba6 6n8 6ba6 6av6 6aq5 6aq5 5y3gt. The choke has a date on it. 29/02/1952 Can anyone help with circuit info please? Thank Kevin

Return to top of page · Post #: 2 · Written at 12:35:16 PM on 1 September 2014.
	Garyoz Location: Perth, WA Member since 19 November 2008 Member #: 381 Postcount: 240
I have emailed you the schematic & parts list. Cheers, Gaz

Return to top of page · Post #: 3 · Written at 12:59:57 PM on 1 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Thanks Gary, much appreciated. Hopefully I can fix it with the help. Regards Kevin

Return to top of page · Post #: 4 · Written at 4:44:14 PM on 2 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Found this on the web Canberra Times 15/01/1953 CALSTAN RADIOGRAMs ,. 8-valvè, air world range. Beautiful cabinet. Price, £113/10/-.

Return to top of page · Post #: 5 · Written at 4:50:29 PM on 2 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
This is a radiogram and is a bit different from 801/C in the AORSM. There are two speaker connectors on the back and there is a big 8 pin valve socket that I don't know what it is for. Can anyone help to work out the speaker resistance? Also upon close look the rectifier is a GZ34. Don't know it is original or replaced later by someone. Maybe a radiogram not listed in the manual.

Return to top of page · Post #: 6 · Written at 5:41:54 PM on 2 September 2014.
	Garyoz Location: Perth, WA Member since 19 November 2008 Member #: 381 Postcount: 240
A photo would help?

Return to top of page · Post #: 7 · Written at 6:11:53 PM on 2 September 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6686
there is a big 8 pin valve socket that I don't know what it is for. Airzone used an octal socket on some radio models for connection to an electric gramophone, with two pins for audio input and two pins for mains power. (I have disconnected the mains power pins on mine for safety). Perhaps your Calstan has a similar setup for another input device?

Return to top of page · Post #: 8 · Written at 8:08:33 PM on 2 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Hi GTC, I think you are right. There are three lines connected, one earth, one to PU input and another to a DC power output.(not mains in this case) So it should be some kind of connector for some other devices. Hi Gary, It is a standard 8 pin socket for valves like 5Y3GT. Just curious to know what kind of devices use such a connector. Not very easy to load photo.

Return to top of page · Post #: 9 · Written at 8:34:43 PM on 2 September 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6686
Not very easy to load photo. Just email them to Brad, as per note #6 above the Quick Reply message posting box.

Return to top of page · Post #: 10 · Written at 9:59:07 PM on 2 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Thanks GTC. Sent a photo of the back of the chassis with the socket.

Return to top of page · Post #: 11 · Written at 10:25:47 PM on 2 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Thanks Brad. The two connector at the right are for speakers I think. They are parallel to each other. The left one connects to the built in gramophone. The socket in the middle is for unknown purposes. The pair of 6AQ5 should have 10,000 ohms according to the circuit. However, there's no values for the speaker. How can I work that out?

Return to top of page · Post #: 12 · Written at 11:23:23 PM on 2 September 2014.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6686
The pair of 6AQ5 should have 10,000 ohms according to the circuit. However, there's no values for the speaker. The impedance of the secondary of the output transformer can be guesstimated if necessary but, first, are there any type number markings on the transformer?

Return to top of page · Post #: 13 · Written at 7:43:41 AM on 3 September 2014.
	Kxdniu Location: Melbourne, VIC Member since 19 May 2014 Member #: 1577 Postcount: 101
Hi GTC, Yes, at the bottom of the transformer is a number like 149 90 I think. It is a sealed black box. Means anything?

Return to top of page · Post #: 14 · Written at 11:55:23 AM on 25 January 2015.
	Bazrex Location: Fassifern, NSW Member since 25 January 2015 Member #: 1687 Postcount: 24
Hi, I have a Calstan 801 chassis similar to yours, but without the octal socket on the rear. The transformer you have pictured is the output transformer and is centre tapped on the primary due to the push-pull arrangement of the two 6AQ5's. The speaker used with these chassis's is usually a 12" with a DC resistance of between 2 & 3 ohms. Wwith mine the speaker socket on the far right of the rear of the chassis is the correct one to use when only one speaker is connected, the other socket is usually reserved for a second 5" speaker of similar impedence to the main speaker, there should be a capacitor coupling the two sockets together rather than a direct parrallel connection. Hope this helps cheers, Baz.

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