I'm attempting a repair on a HP 3582A audio spectrum analyser. The power supply is not giving the right voltages and showing a red LED on one of the boards. I have removed all seven of the power boards and noted the capacitors and having desoldered one end of a few of them found that they are well out of spec. The caps are as follows:
1 – A 2xB
2 – C 2xD 2xE
3 – G F
4 – G H
5 – G H
6 – G H
7 – G H
A = 1 x 1700uF/30 axial 59x21
B = 2 x 300uF/40 axial 44x18
C = 1 x 45uF/250 axial 56x17
D = 2 x 350MF/16 axial 29x10
E = 2 x 50uF/50 axial 24x10
F = 1 x 1000MFD/12 axial
G = 4 x 470uF/25V DUAL axial 43 x 12.5
H = 5 x 47uF /100V DUAL axial 43 x 12.5
OK so this should not be difficult (except on the wallet). All the caps are axial type with G & H being DUAL axial and it is these caps that I just cannot find ANYWHERE. I only know of one supplier for any type of dual axial caps and they only sell the type that are normally used on valve amplifiers.
Unfortunately there isn't really enough space to fit two single axial caps into the space even with modern smaller caps. If I have no choice I would have to but it will not be as tidy as it should be.
Yes I dislike that you can't get dual axial caps either, that is quite a interesting design decision you used to be able to make.
Absolutely. The piece of equipment I am repairing deserves to be repaired using top quality components as per the original design. I really don’t want to have to cobble in a bodge using two caps where one should go. It’s probably possible but each of the seven power boards slides in and there isn’t even much space.
the repair forum had the same problem a while back with a old HP power supply that had a oil filled tapped capacitor. The modern solution is downright ugly in comparison