Hallicrafters SX-28 rectifier. - UK Vintage Radio Repair and Restoration Discussion Forum

deliverance · 9th Feb 2023, 8:07 pm

Hi all I recently acquired SX-28 which after changing a fair few capacitors and resistors' is working well but in place of the 5Z3 rectifier is a 5U4G the mains transformer is the original one running on 115v as is the choke . Will the 5U4G be okay to leave as is or should I fit the original 5Z3 with a new base . Thoughts gentleman cheers Chris.

Ed_Dinning · 9th Feb 2023, 8:15 pm

Hi Chris, they look pretty similar electrically , both big beasts.
Main difference is the base heater ratings (main worry ) are both 5V @ 3A

Ed

deliverance · 9th Feb 2023, 8:25 pm

Hi Ed . Thanks for your reply based on that I may as well leave it there the set has been on most of the day the mains transformer doesn't run hot .

Ed_Dinning · 9th Feb 2023, 8:30 pm

Hi Chris, that's fine.
It would pay you to get something like the Wireless World valve data listings, not much and has all the relevant data to help making subs for hard to get valves

Ed

turretslug · 9th Feb 2023, 10:55 pm

A trawl around valve data suggests that a 5U4G is essentially a 5Z3 on an International Octal as opposed to a UX4 base, so it should be fine.

Kevin Hoyland · 11th Feb 2023, 10:52 am

Morning Chris.
Will you please put some photos of the SX28 on i would love to see them
Kev.
Ps we will have to have a talk on the phone its been a long time.

deliverance · 11th Feb 2023, 4:01 pm

Hi Kev . Yes I will do give me a call .

9th Feb 2023, 8:07 pm	#1
deliverance Heptode Join Date: Apr 2015 Location: Manchester, UK. Posts: 710	Hallicrafters SX-28 rectifier. Hi all I recently acquired SX-28 which after changing a fair few capacitors and resistors' is working well but in place of the 5Z3 rectifier is a 5U4G the mains transformer is the original one running on 115v as is the choke . Will the 5U4G be okay to leave as is or should I fit the original 5Z3 with a new base . Thoughts gentleman cheers Chris.

9th Feb 2023, 8:15 pm	#2
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Hallicrafters SX-28 rectifier. Hi Chris, they look pretty similar electrically , both big beasts. Main difference is the base heater ratings (main worry ) are both 5V @ 3A Ed

9th Feb 2023, 8:25 pm	#3
deliverance Heptode Join Date: Apr 2015 Location: Manchester, UK. Posts: 710	Re: Hallicrafters SX-28 rectifier. Hi Ed . Thanks for your reply based on that I may as well leave it there the set has been on most of the day the mains transformer doesn't run hot .

9th Feb 2023, 8:30 pm	#4
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Hallicrafters SX-28 rectifier. Hi Chris, that's fine. It would pay you to get something like the Wireless World valve data listings, not much and has all the relevant data to help making subs for hard to get valves Ed

9th Feb 2023, 10:55 pm	#5
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,396	Re: Hallicrafters SX-28 rectifier. A trawl around valve data suggests that a 5U4G is essentially a 5Z3 on an International Octal as opposed to a UX4 base, so it should be fine.

11th Feb 2023, 10:52 am	#6
Kevin Hoyland Heptode Join Date: Feb 2009 Location: Rotherham, South Yorkshire, UK. Posts: 559	Re: Hallicrafters SX-28 rectifier. Morning Chris. Will you please put some photos of the SX28 on i would love to see them Kev. Ps we will have to have a talk on the phone its been a long time.

11th Feb 2023, 4:01 pm	#7
deliverance Heptode Join Date: Apr 2015 Location: Manchester, UK. Posts: 710	Re: Hallicrafters SX-28 rectifier. Hi Kev . Yes I will do give me a call .