[Heathkit] HP-23(*) differences.

[Kenneth G. Gordon]

On 8 May 2007 at 15:47, yash at aol.com wrote:

> 
> Gorden
> I have never seen any differances in any hp supply. the 23 and the 23a
> had 6 v winding the latter b and c didn't. they were all rated at 820
> vdc no load and 700vdc at 250 ma. load. your supply sounds normal
> .Unless your hi voltage current draw is higher for some reason... then
> the hv might decrease just a bit more under the heavier load. good
> luck dale wt4t

I used the same rig with the two different power supplies: the SB-
102, which has a meter position to read the HV.

With the older PS, that meter reads noticeably UNDER 800 VDC, 
no load, and CONSIDERABLY under 800 VDC at even 1/2 load (50 
watts output).

With the NEWER PS, the meter reads slightly over 800 VDC, no 
load, and very slightly UNDER 800 VDC at full load, of around 100 
watts output.

There IS a difference in the PSs, since everything else is identical: 
same rig, same load, same frequency, same tubes, same etc. The 
only thing being different is the PS.

Both PSs operate at normal temperatures.

Ken Gordon W7EKB