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 PSU advice 

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After 20years off the air, back in April this year my Watson 30A PSU just gave up.

Looking around the web for a new 30A linear PSU but a lot of brands I don't recognise. Are there any decent ones in the £100 to £200 bracket?


Sun Sep 20, 2020 8:35 am
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 PSU advice 
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Post Re: PSU advice
https://www.nevadaradio.co.uk/product/nevada-ps-40m/

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Sun Sep 20, 2020 10:52 am
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Or you could just repair the old one, but who does that anymore? :)

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Been there and got the T shirt, sadly like the T shirt the memory of it has long since faded, gone rather tatty, and finally been consigned to the bin!


Sun Sep 20, 2020 10:54 am
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Beware the PS-40M.
The fan sounds like a jet taking off.
Mods available on the web to silence the thing. Couple of resistors, have it running all the time
nice and quiet, only heard it kick in once for a few seconds then back to peace and quiet.
Other than that it does what it should.

Phil - G7BZD


Sun Sep 20, 2020 11:18 am
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I run one of these with no problems or noise, one sold recently on ebay for £100 so this priced at £75 is probably about right.

https://www.radioworld.co.uk/second-han ... wer-supply

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Sun Sep 20, 2020 11:30 am
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I'm with Dave on that one, either repair or rebuild it. I say rebuild because most linear PSU's don't have over-voltage protection fitted and I don't feel comfortable putting my £2000 radio on a PSU with no protection when a pass transistor pops, that's why I've completely rebuilt my Manson PSU with a much simpler current regulation circuit, much beefier pass transistors and more importantly, over-voltage protection using a big fat industrial Thyristor.

Having said that, I use a Diamond GZV4000 SMPSU I bought years ago and there's no noise from that at all as far as I can hear and it used to sit above the ATU when I had the open wire feeders coming right back to the shack.

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Sun Sep 20, 2020 11:57 am
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I too would be up for repairing it first too.

Try down your local club if you don't think your able to repair it.
Even remaking it with new circuitry is an option as long as the transformer is OK.


Sun Sep 20, 2020 6:28 pm
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 PSU advice 

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I am in the process of fault finding the PSU. Transformer is OK. Looking like the rectifiers as it keeps blowing the 5A fuse on the front.

I have removed the pos from the rectifiers in order to measure the voltages but blew the fuse.
So currently got the transformer only on line, i get 20V across the main and 8V across the other 2 outputs.

Need to reattach the 8V first and test once the kids are in bed.


Sun Sep 20, 2020 6:45 pm
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You need to add your location to your profile.


Sun Sep 20, 2020 7:02 pm
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Is it the Watson W-30A?

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Sun Sep 20, 2020 8:56 pm
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Yes it is.

Bit more testing tonight and its looking like the rectifiers have gone. So will have to order some and have a crack at fixing it.


Sun Sep 20, 2020 10:54 pm
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Have you got the circuit diagram?
Googling shows it on transmision1's forums.


Tue Sep 22, 2020 10:02 pm
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Yes I found the circuit diagrams online.


Wed Sep 23, 2020 11:52 am
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Picked this up over the weekend as all the parts arrvied. Changed the bridge rectifiers and its up and running again.


Mon Sep 28, 2020 12:15 pm
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M0CGF wrote:
Picked this up over the weekend as all the parts arrived. Changed the bridge rectifiers and its up and running again.

Sorted! :good:

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Been there and got the T shirt, sadly like the T shirt the memory of it has long since faded, gone rather tatty, and finally been consigned to the bin!


Mon Sep 28, 2020 12:16 pm
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