Discussion in '"Boat Anchor" & Classic Equipment' started by AF6LJ, Jul 11, 2014.
That power supply looks like a beast!
I saw that and thought it would be an interesting idea, its implementation would be different in the 350 due to the slightly strange configuration of the VFO. In the VFO the tank circuit components are inclosed in a shielded box, however the PCB that has the active parts on it is mounted under the chassis, more on that later........
It is not really that large, the transformer is a little larger than the one in my HP-23, the way it is put together servicing was not at the top of the list of priorities. I took 27 color 8" X 10" photographs with circles, arrows and a paragraph on the back of each one in order to aid me in putting it back together in a speedy manner.
The Cambria X Lock implementation of Huff n Puff is just elegant. I've spent hours reading through the website and related links. I do intend to give this method a try when I select a suitable candidate radio!
I cant find on the website how much taht Cambria X costs. But from UK it won't be cheap!
Finally got the pictures to show up.
Looks like what you got is still all-original (!). 40+ year old electrolytics....should clean up nicely.
That PS is actually pretty small for what it does. Its layout is rather odd, but that's because Swan wanted it to fit a certain size cabinet, to match the rigs it powered.
Yes, the drift may not be bad at all on 75/40/20. Particularly after some warmup. Will be interesting to see just how "bad" it is.
You're not looking. It's right there at the bottom of this page:
Why do you say that?
The price given is in British pounds - 33.30 with VAT, 27.75 without. I think export sales don't pay VAT.
27.75 British pounds converts to US $47.51. That's pretty cheap for what it does and what's included in the kit. Particularly if it makes a drifty old rig stable. Plus it's cheaper than any DDS VFO kit I've seen.
Based on what looks like date codes. I'm thinking 1973 on the power supply.
We know the radio is older
It doesn't look there has been any rework, although the workmanship isn't mil-spec in terms of soldering and such, thatis to be expected. The workmanship on the actual radio looks to be a lot better......
I rebuilt the Swan 700CX PS, all I did was replace the electrolytics with new Tubulars. It is harder to find the Electrolytics in an AXIAL Package than Radial. They are much more expensive too. It is probably best to just adapt the Radials for use in PS's like this. Physically they are about the same size.
Mouser Wouser has them.
I just finished the wired circuit board thatleaves two caps in the chassis, reassembly and testing.
Pictures tomorrow before a marry the PWB to the power supply.
I didn't want to leave the original diodes in there and replacing the resistors isn't much more effort.