Metal Rectifier No38 - UK Vintage Radio Repair and Restoration Discussion Forum

Neil Purling · 6th Jul 2009, 7:30 am

I hoiked one of these out of one of those 4 valve kit superhets.
It still had a legible catalogue number ZA 15406.
I Googled that and it came up with a reference to the No4 Power Unit for the #22 set using four of the Metal Rectifier No38 in a bridge formation.
I am interested in finding the specification of a single rectifier.
There was a painted number/set of numbers at the other end of the rectifier, but that is mostly missing due to the paint flaking off.

Station X · 6th Jul 2009, 10:28 am

I assume this is a stacked disc arrangement?

I've looked at the diagram for the PSU No, 4. It's a vibrator type with the bridge rectifier connected across the secondary of the step up transformer. It then supplies the HT via an LCLC smoothing arrangement. Output is 325V at 80mA.

6th Jul 2009, 7:30 am	#1
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Metal Rectifier No38 I hoiked one of these out of one of those 4 valve kit superhets. It still had a legible catalogue number ZA 15406. I Googled that and it came up with a reference to the No4 Power Unit for the #22 set using four of the Metal Rectifier No38 in a bridge formation. I am interested in finding the specification of a single rectifier. There was a painted number/set of numbers at the other end of the rectifier, but that is mostly missing due to the paint flaking off.

6th Jul 2009, 10:28 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Metal Rectifier No38 I assume this is a stacked disc arrangement? I've looked at the diagram for the PSU No, 4. It's a vibrator type with the bridge rectifier connected across the secondary of the step up transformer. It then supplies the HT via an LCLC smoothing arrangement. Output is 325V at 80mA. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.