D&A Phantom 500

Forum for technicians, to bounce ideas off each other.
musicbizzy
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Posts: 9
Joined: Monday 30th Mar 2009, 9:58
First Name: Bobby
Location: Kansas City, MO 64151

D&A Phantom 500

Postby musicbizzy » Saturday 4th Apr 2009, 11:39

Does anyone know where I can get a schematic and or owners manual of the older D&A
phantom 500 12 tube version that used a 6AQ5 keying tube. I need to know the value of the SSB delay capacitor across the 6AQ5. I would be willing to purchase a manual and a schematic and pay postage for them.

musicbizzy
Newbie
Newbie
Posts: 9
Joined: Monday 30th Mar 2009, 9:58
First Name: Bobby
Location: Kansas City, MO 64151

Re: D&A Phantom 500

Postby musicbizzy » Sunday 5th Apr 2009, 2:29

OK, got a schematic and the SSB cap was a 10uf at 150vdc.
This amp has been moded for 4 17JG6's as the four drivers and 8 17JM6's as the output
finals. After replacing a couple of caps, the plates are at 850 vdc. The best I can get her up to is 100 watts. All the stages show a definte increase in power out as they are engaged.
I would suspect a problem in the driver first since when engaged as the LOW side I only get 25 watts out. Anybody got any ideas as to which circuit I should look at to get this beast up and running close to it's designed specs. I have seen these do around 850 watts out with 3 watts drive.


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