Tech Talk

Forum home - Go back to Tech talk

A little confused?
« Back · 1 · 2 · Next »
Return to top of page · Post #: 16 · Written at 12:02:39 PM on 31 August 2020.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 563
Sorry double post.

Return to top of page · Post #: 17 · Written at 12:05:17 PM on 31 August 2020.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 563
Circuit diagram shows first filter cap orientation wrong. As wired image is correct. JJ

Return to top of page · Post #: 18 · Written at 3:23:36 PM on 31 August 2020.
	Destino Location: Bells Beach, VIC Member since 20 July 2020 Member #: 2428 Postcount: 39
Marcc: Again thanks. The thing in the clamp looks like a coil of some sort. It is connected at one end to the plate of the 6SK7GT. I have uploaded a picture of this coil to http://www.miramar.com.au/valve/Calstan529_1.jpg There is no parts list that I have been able to find. If your reference to a 528 is the Calstan 528 schematic on Kevin Chants site then there are quite a few differences between the 529, 529X and 528 versions. The 528 has different valves, the choke is a different value just to name a few. Tinkera123: The two 4μF capacitors appear to have been replaced with one 8μF capacitor. This capacitor appears to be much younger than the rest of the components and may be a later modification. Cheers Peter

Return to top of page · Post #: 19 · Written at 3:27:30 PM on 31 August 2020.
	Destino Location: Bells Beach, VIC Member since 20 July 2020 Member #: 2428 Postcount: 39
Johnny: Which circuit are you referring to and can you point me to the exact capacitor you are talking about. In replacing the capacitors I have replaced them exactly as they were when I received the radio. Cheers Peter

Return to top of page · Post #: 20 · Written at 4:19:10 PM on 31 August 2020.
	MonochromeTV Location: Melbourne, VIC Member since 20 September 2011 Member #: 1009 Postcount: 1208
Just be aware that the Calstan/Zenith schematics have been drawn by the AORSM, not the manufacturer, & often contain errors. Hence your filter caps showing the wrong polarity. For those who have come in late, the AORSM is a 14 volume set of schematics for Australian radios made between 1937 & 1955. A dreadful publication, but unfortunately it’s all we have for brands like Calstan.

Return to top of page · Post #: 21 · Written at 4:47:41 PM on 31 August 2020.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 563
Peter, reference is the circuit as shown in this post. First filter cap. 2X4mfd in parallel are drawn wrong.

« Back · 1 · 2 · Next »
You need to be a member to post comments on this forum.

Tech Talk

Sign In