tubes age 84
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Date: Mon, 07 Jan 2002 20:29:53 -0500
Subject: [R-390] sp-600-jx-17
Recently purchased this unit and seems to be drifting. I do not leave it on 24/7.
How long should it take to stabilize from off? Any particular tubes that may need
looking at?
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Date: Mon, 7 Jan 2002 21:27:38 EST
Subject: Re: [R-390] sp-600-jx-17
Try replacing the OA2 voltage regulator tube, a weak one will cause drift. Also,
look at the bottom of the power supply transformer, if your voltage is over 117
volts, I would suggest moving it to the 139 volt tap. Les Locklear
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Date: Mon, 7 Jan 2002 21:46:31 -0500
Subject: Re: [R-390] sp-600-jx-17
>................... OA2 voltage regulator tube, a weak one will cause drift.
Add to that regulator issue...make sure the dropping resistor is within spec.
They often drift high and cause poor regulation. You should have little to no drift
on that rig, however it is not unusual for the BFO to move around a bit making
SSB a little tough on a long term basis. But the rest should be solid.
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Subject: Re: [R-390] 26Z5W - 12BW4 replacements
Date: Mon, 7 Jan 2002 21:22:50 -0700
Barry and All: I have done this conversion and it works just fine. The B+ voltages
are within three volts of the published values. Kurt Holbrook
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Date: Mon, 7 Jan 2002 21:14:15 -0800 (PST)
Subject: Re: [R-390] 6802 - standby
Harry, I knew that you shouldn't do it, but never really knew why. This is the best
explanation of the phenomenon I have ever heard. Fills in a gap in my
knowledge that I have had since
(14 pages)
(10 pages)
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