Several years ago, WB3EEU modified a QSK 1500.
He called it a QSK 3000 because it was good for 3000 watts
continuous duty.
He replaced D3, D4, and D5 with Macom 4P709-487's
He replaced D2 with a Macom 4P902-985.
He replaced C3 and C4 with 0.1 mfd @ 2000v Sprague's.
He replaced feed-thru caps. (Ft-1,2,3,4) with 1500pf @600v (Tusonix
357000X5U0152M)
Too bad DEO went out of business...this would have been a real winner.
I hope this will help you get back in business.
(((73)))
Phil, K5PC
Phil Clements
410 VZ CR 4903
Ben Wheeler, TX 75754
----- Original Message -----
From: John K4WJ <k4wj@att.net>
To: <amps@contesting.com>
Sent: Tuesday, June 13, 2000 10:39 AM
Subject: [AMPS]
>
> I just tried using a DEO QSK-1500 hundred for the first time since I bought
> it a couple of years ago and it doesn't work. I've done some trouble
> shooting on the unit, which is rather straightforward, and determined that
> D5 is not working.
>
> I determined this because the high voltage is less than 200 volts when I
> key the unit. I then removed the fuse lamp which isolates D5 from D3 and D4
> . I then removed the high voltage, wire going to the feed thru capacitor
> FT4. I extended the high voltage wire and put it on D4 and when I keyed the
> unit the voltage was around 485 volts. When I touched D5 and keyed the unit
> the voltage fell to around 185 volts. Resistance measurements were a lot
> different across D5 than they were across D3 and D4.
>
> According to the QSK 1500 service and technical manual, D3, D4 and D5 are
> all suppose to be KS-1001 units. I have no idea what the parameter are for
> a KS-1001 pin diode.
>
> Does anyone out there know what the parameters are so that I can try to
> find a replacement pin diode for my QSK-1500. Better yet, does anyone know
> which pin diode can be used to replace it?
>
> I want to use the QSK-1500 with an Ameritron ALS-600 solid state amp for
> casual QSO's when 75 watts just won't do the trick.
>
> Thanks in advance..de John/K4WJ
>
>
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>
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