OK, a local ham kindly gave me a spare glitch resistor as a replacement for
R12, and the Drake has been repaired, tested, and then packed for the trip.
The homebrew 5m amp has been reconnected to its internal HV p/s, tested, and
then packed. I may never find out what caused R12 to blow, because I'm
disinclined to mess with the power supply switch again. Sure would be nice to
get higher voltage on the 6m amp, because I'm sure the 3-500Z would give me
double the current 350w output with a better p/s, but c'est la vie.
Thanks to all who responded, both on the forum and offline.
73, Bill
--- On Mon, 5/31/10, Bill Dzurilla wrote:
> From: Bill Dzurilla
> Subject: Repacement for R12 fuse resistor on L-4B and L-7 power supply?
> To: drakelist@zerobeat.net
> Date: Monday, May 31, 2010, 3:04 PM
> Well, I have determined that the
> cause of my power supply problem is R12, the .82 ohm 2 watt
> resistor on the B+ output of the power supply. It is
> visibly damaged.
>
> I have searched this list and elsewhere and it seems there
> is a split of opinion on whether to replace R12 with a
> similar resistor. Rich Measures and others have
> suggested using instead a 10 ohm 10 watt wirewound
> resistor.
>
> I am leaving for Europe on Wednesday and need to find a
> replacement quickly. Radio Shack has a 10 ohm 10 watt
> wirewound that I can get locally if that will work.
> Don't think I have time for any mail order.
>
> What do you think, will the Radio Shack one work?
>
> 73, Bill NZ5N
>
>
>
>
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