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yamanx1 Profile
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Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-1)
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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
17/Aug/2018, 3:59 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
MrFidget Profile
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Freebander

Registered: 09-2018
Posts: 30
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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
28/Apr/2020, 7:05 am Link to this post Send Email to MrFidget   Send PM to MrFidget Blog
 
yamanx1 Profile
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Head Honcho

Registered: 09-2007
Location: In a world of my own
Posts: 4849
Karma: 32 (+33/-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
29/Apr/2020, 6:48 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
MrFidget Profile
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Freebander

Registered: 09-2018
Posts: 30
Karma: 0 (+0/-0)
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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.

:-)
29/Apr/2020, 11:51 pm Link to this post Send Email to MrFidget   Send PM to MrFidget Blog
 


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