Heathkit HP23A PSU - UK Vintage Radio Repair and Restoration Discussion Forum

David Simpson · 8th Aug 2014, 8:57 pm

Does anyone have any info or experience of this HV PSU, please ? It can supply 900V, 300V, Heaters, and -130V.

Regards, David

Station X · 8th Aug 2014, 9:53 pm

You can download the circuit here:-

http://www.vintage-radio.info/heathkit

AdamAnt316 · 13th Aug 2014, 7:52 am

I have one. It's meant to be used with the SB/HW series of tube-based ham radio transceivers put out by Heathkit in the 1960s and 1970s. There were several variations made of the HP23 series, with the A probably being the most versatile (offering adjustable bias voltage, switchable secondary B+, and a center-tapped 12.6V winding). Later versions generally lacked one or all of these features. More info can be found here:

http://www.w6ze.org/Heathkit/Heathkit_026_HP23C.pdf

Attached are some pictures of my HP23A, along with the SB-600 speaker cabinet it's installed within, and the SB-102 transceiver it powers.
-Adam

David Simpson · 13th Aug 2014, 5:52 pm

Thanks Graham & Adam for your replies. I've managed to download the circuit diagram. Plus found a site with the 20 page construction Manual pdf. Now need to find an 11 pin connection plug. Regards, David

AdamAnt316 · 13th Aug 2014, 9:19 pm

You might want to try places which sell parts for Leslie organ speakers, as the later models used a plug like that. Good luck!
-Adam

AC/HL · 14th Aug 2014, 1:59 am

It looks similar to an 11 pin relay base.
I've never noticed plugs, but an old relay may be "adjustable" if so.

David Simpson · 14th Aug 2014, 10:03 am

Thanks Bill for jogging my memory. I think I've an old relay lying in a gash box somewhere. Just hope it didn't get cleared out a year or two back.

Regards, David

8th Aug 2014, 8:57 pm	#1
David Simpson Nonode Join Date: Mar 2008 Location: Aberdeen, UK. Posts: 2,853	Heathkit HP23A PSU Does anyone have any info or experience of this HV PSU, please ? It can supply 900V, 300V, Heaters, and -130V. Regards, David

8th Aug 2014, 9:53 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Heathkit HP23A PSU You can download the circuit here:- http://www.vintage-radio.info/heathkit __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

13th Aug 2014, 7:52 am	#3
AdamAnt316 Retired Dormant Member Join Date: Jul 2014 Location: Westford, Massachusetts, USA Posts: 9	Re: Heathkit HP23A PSU I have one. It's meant to be used with the SB/HW series of tube-based ham radio transceivers put out by Heathkit in the 1960s and 1970s. There were several variations made of the HP23 series, with the A probably being the most versatile (offering adjustable bias voltage, switchable secondary B+, and a center-tapped 12.6V winding). Later versions generally lacked one or all of these features. More info can be found here: http://www.w6ze.org/Heathkit/Heathkit_026_HP23C.pdf Attached are some pictures of my HP23A, along with the SB-600 speaker cabinet it's installed within, and the SB-102 transceiver it powers. -Adam Attached Thumbnails

13th Aug 2014, 5:52 pm	#4
David Simpson Nonode Join Date: Mar 2008 Location: Aberdeen, UK. Posts: 2,853	Re: Heathkit HP23A PSU Thanks Graham & Adam for your replies. I've managed to download the circuit diagram. Plus found a site with the 20 page construction Manual pdf. Now need to find an 11 pin connection plug. Regards, David

13th Aug 2014, 9:19 pm	#5
AdamAnt316 Retired Dormant Member Join Date: Jul 2014 Location: Westford, Massachusetts, USA Posts: 9	Re: Heathkit HP23A PSU You might want to try places which sell parts for Leslie organ speakers, as the later models used a plug like that. Good luck! -Adam

14th Aug 2014, 1:59 am	#6
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Heathkit HP23A PSU It looks similar to an 11 pin relay base. I've never noticed plugs, but an old relay may be "adjustable" if so.

14th Aug 2014, 10:03 am	#7
David Simpson Nonode Join Date: Mar 2008 Location: Aberdeen, UK. Posts: 2,853	Re: Heathkit HP23A PSU Thanks Bill for jogging my memory. I think I've an old relay lying in a gash box somewhere. Just hope it didn't get cleared out a year or two back. Regards, David