[AMPS] L7 PS

[Phil T. (VA3UX)]

Those larger capacitors will be fine Jaime...go ahead and use them.

In short order, Rich Measures will also reply (won't you Rich ?!) with
advice about changing the equalizing resistors to 3 watt, 150K metal oxide
film ("MOF") resistors and perhaps upgrading the diodes to 1N5408's.  This
is all good advice, the modifications are cheap and are worthwhile.

Phil

At 05:41 AM 1/5/2000 -0000, you wrote:
>
>
>Hi all,
>I am in the process to renew my old Drake L7 PS, just before I have changed
>the transformer for a Peter Dal, but the elec. caps are a bit old and dry.
>Drake use to surplus Sprague 200MF-450v 85 deg but now they don't have any,
>I have fond Sprague 230MF-450v 85 deg about the same size. Will be any
>problem to use this caps with a bit more the capacity ( 30MF, original are
>200MF ) to substitute all 8 caps? The PS gets the HV with a voltage doubler
>so this caps are the filter capacitors.
>Will be better to change also all the original 14 diodes ( there is not any
>shorted or aparently damaged only old )and shunt resistors of 150 oms 1/2w?.
>I have had before arcs and diode burnt before with this PS, maybe will be a
>good idea to add a step-start circuit.
>
>Wish you all a HNY 2.000.
>73, Jaime.
>
>
>
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