D&A Phantom Linear Amplifier 12 tube

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musicbizzy
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D&A Phantom Linear Amplifier 12 tube

Post by musicbizzy » Friday 3rd Apr 2009, 15:40

Does anyone know the value of the SSB capacitor across the 6AQ5 small keying tube?
I would suspect possibly a 10-47 uf but not sure.

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

Re: D&A Phantom Linear Amplifier 12 tube

Post by musicbizzy » Sunday 5th Apr 2009, 2:25

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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