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D & A Amp

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Blue Ox2
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D & A Amp

Post by Blue Ox2 » Monday, 09 July 2018, 13:37 PM

Hi Gentlemen,

I just got a D & A Raider from the '70's.
Any good suggestions on tests, tuning it and setting the band knobs for 11 meter?
I need to set the Load knob with a tiny screwdriver.
All good ideas, suggestions, recollections of uses in prior lives are appreciated.

73,

Mike

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Re: D & A Amp

Post by MDYoungblood » Monday, 09 July 2018, 18:26 PM

Hmm, the little potentiometer on the back is the grid tune, hopefully no one has played with that, tuning is done using the "Tune and Load" on the front (the switch in the back if not marked should be in the down position).
If it hasn't been used in a while I'd turn it on and not key it up, let the caps make some temperature to liquefy the oil again.
I would make my first adjustments into a dummy load, set the load and tune to center, switch on back to 10/15m, key with just 2 to 4 watts, adjust the load to max on a watt meter then tune, unkey and let it cool down, be quick about it. Keep repeating these steps until the amp shows max output then back off the load a touch to give it some breathing room. When you hook it to a antenna you will have to adjust it again but it will be close.

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User avatar
Blue Ox2
Donor
Donor
Posts: 278
Joined: Monday, 27 March 2017, 16:17 PM
Radio: McKinley&Wash&142GTL
Antenna: Patriot 12& DR-Dipol
Name: Mike KPA-223on the IMax2000
Home Phone: Galaxy DX 2517
Cell Phone: 7175724729
Location: Lititz, PA (Heart of Lancaster County)
Contact:

Re: D & A Amp

Post by Blue Ox2 » Tuesday, 10 July 2018, 3:19 AM

Great information Greg, thanks.

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How do you do from Blue Ox2
KPA223
American Eagle SSB Group * AE1582
The World Radio Club * 2WR1582
Lititz, PA (2013 "Coolest Small Town in America")


**************




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