Hallicrafters SX25 Receiver. - UK Vintage Radio Repair and Restoration Discussion Forum

vintageray · 2nd Dec 2009, 4:37 pm

I am trying to restore this comms set. It has no mains transformer. I need to know the HT voltage and current. I think it should be about 300V, at about 120mA, but I'm only guessing.

HamishBoxer · 2nd Dec 2009, 5:35 pm

Do you have the circuit for this?

David

vintageray · 2nd Dec 2009, 5:44 pm

HI yes i have the circuit diagram but there is no reference to the ht voltage anywhere on the circuit or in the article, i got this from VINTAGE AMATEUR AND MILITARY RADIO.

Station X · 2nd Dec 2009, 5:47 pm

Download the manual here. A quick glance (don't quote me on this) shows 300V AC and 280V DC at the rectifier. Work out the current by adding up the anode and screen currents of all the valves.

http://bama.edebris.com/manuals/hallicra/sx25/

vintageray · 4th Dec 2009, 11:52 am

many thanks for your help i have now got everything i need

2nd Dec 2009, 4:37 pm	#1
vintageray Retired Dormant Member Join Date: Feb 2009 Location: Wimborne, Dorset, UK. Posts: 24	Hallicrafters SX25 Receiver. I am trying to restore this comms set. It has no mains transformer. I need to know the HT voltage and current. I think it should be about 300V, at about 120mA, but I'm only guessing. Last edited by Station X; 2nd Dec 2009 at 5:07 pm. Reason: SKP.

2nd Dec 2009, 5:35 pm	#2
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: Hallicrafters SX25 Receiver. Do you have the circuit for this? David

2nd Dec 2009, 5:44 pm	#3
vintageray Retired Dormant Member Join Date: Feb 2009 Location: Wimborne, Dorset, UK. Posts: 24	Re: Hallicrafters SX25 Receiver. HI yes i have the circuit diagram but there is no reference to the ht voltage anywhere on the circuit or in the article, i got this from VINTAGE AMATEUR AND MILITARY RADIO.

2nd Dec 2009, 5:47 pm	#4
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Hallicrafters SX25 Receiver. Download the manual here. A quick glance (don't quote me on this) shows 300V AC and 280V DC at the rectifier. Work out the current by adding up the anode and screen currents of all the valves. http://bama.edebris.com/manuals/hallicra/sx25/ __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

4th Dec 2009, 11:52 am	#5
vintageray Retired Dormant Member Join Date: Feb 2009 Location: Wimborne, Dorset, UK. Posts: 24	Re: Hallicrafters SX25 Receiver. many thanks for your help i have now got everything i need Last edited by Darren-UK; 4th Dec 2009 at 12:21 pm. Reason: Unnecessary quote removed.