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Old 8th January 2012, 10:10 AM   #1
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Default RCA Manual Typo?

I was looking through an old RCA manual trying to find an integrated amplifer to build and found this one shown below. The specs call for a 1200V ct. transformer,but the filter caps would be way below specs,or am I just missing something here?
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Old 8th January 2012, 10:21 AM   #2
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The power supply uses a choke-input filter.
Eg, first you have the rectifier, wich is immediately followed by a choke and only then comes the first capacitor.
This type of power supply typically has a lower voltage than when the rectifier is immediately followed by a capacitor.
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Old 8th January 2012, 10:52 AM   #3
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This amp has 450 V on plates and 400 on screen grids ...
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Old 8th January 2012, 10:52 AM   #4
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1200vct is 600v per side, less rectifier losses, less choke losses, means the caps, while marginal, will be ok, e&oe...
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Old 8th January 2012, 12:13 PM   #5
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The rating for the caps on the primary is 600V - that's not the secondary voltage.
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Old 8th January 2012, 12:17 PM   #6
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Quote:
Originally Posted by hidnplayr View Post
The power supply uses a choke-input filter.
Eg, first you have the rectifier, wich is immediately followed by a choke and only then comes the first capacitor.
This type of power supply typically has a lower voltage than when the rectifier is immediately followed by a capacitor.
Thanks, I should have caught that.
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Old 8th January 2012, 12:18 PM   #7
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Quote:
Originally Posted by aardvarkash10 View Post
1200vct is 600v per side, less rectifier losses, less choke losses, means the caps, while marginal, will be ok, e&oe...
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Old 8th January 2012, 12:19 PM   #8
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Has anyone ever constructed this one,I like the use of a regulated power supply,I have several 6CB6A,and OA2 VR tubes.
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Old 8th January 2012, 01:24 PM   #9
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Quote:
Originally Posted by denny9167 View Post
Has anyone ever constructed this one,I like the use of a regulated power supply,I have several 6CB6A,and OA2 VR tubes.
Take a look at the engineers amp of Pete Millett. A more modern version of this amp you could say and a lot of experiences of builders on this forum
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Old 8th January 2012, 01:28 PM   #10
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The reference to 600 volts / 600 volts shown next to the primary winding of the power transformer is the rating on the noise suppressors caps.....not the output voltage of the PT.
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