yamanx1
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Registered: 09-2007
Location: In a world of my own
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Someone to carry out diagnostic
I need some help with my Drake L-4B, I think the power supply needs updating or repairing.
Can anyone help, or recommend someone to me
Many thanks
---
By all means think yourself big, but never think others small.... R.F.Scott
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17/Aug/2018, 3:59 pm
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MrFidget
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Registered: 09-2018
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Re: Someone to carry out diagnostic
Did you ever get it sorted ?
I have a non radio PSU on my bench. I reckon it will cost a gorilla to repalce, given the crappy aussie exchange rate, but I also probably have a 5% chance of fixing it.
All potted in some goop, surface mounted components and no chip numbers. Fuse gone. Bridge Rectifier is OK. not short, but low impedance on the promary V+ to 0V
I'll be calling the overseas supplier tonight
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28/Apr/2020, 7:05 am
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yamanx1
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Registered: 09-2007
Location: In a world of my own
Posts: 4894
Karma: 40 (+41/-1)
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Re: Someone to carry out diagnostic
Yes
I did it myself using the Harbach kit. Amp works perfect now, good for 1200w on 11m and about 1500 on 20m
---
By all means think yourself big, but never think others small.... R.F.Scott
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29/Apr/2020, 6:48 pm
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MrFidget
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Re: Someone to carry out diagnostic
Niiiiice :-)
With my PSU, I hit up the supplier for a replacement. I need to remove a bunch of filter toroids to get the switching FETs and even then I have no guarantees. If you get flashover to the gate, you take out the driver chips and no chance of working out what they are without some extensive research.
But I did find a locally sourced sub $100 25A @12.8-15V PSU when loooking for possible alternatives.
:-)
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29/Apr/2020, 11:51 pm
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