RCA Manual Typo?

denny9167 · 8th January 2012, 10:10 AM

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?

hidnplayr · 8th January 2012, 10:21 AM

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.

radiostar · 8th January 2012, 10:52 AM

This amp has 450 V on plates and 400 on screen grids ...

aardvarkash10 · 8th January 2012, 10:52 AM

1200vct is 600v per side, less rectifier losses, less choke losses, means the caps, while marginal, will be ok, e&oe...

CharleyW · 8th January 2012, 12:13 PM

The rating for the caps on the primary is 600V - that's not the secondary voltage.

denny9167 · 8th January 2012, 12:17 PM

Quote:

Originally Posted by hidnplayr

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.

denny9167 · 8th January 2012, 12:18 PM

Quote:

Originally Posted by aardvarkash10

1200vct is 600v per side, less rectifier losses, less choke losses, means the caps, while marginal, will be ok, e&oe...

denny9167 · 8th January 2012, 12:19 PM

Has anyone ever constructed this one,I like the use of a regulated power supply,I have several 6CB6A,and OA2 VR tubes.

Jaap · 8th January 2012, 01:24 PM

Quote:

Originally Posted by denny9167

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

brucetassin · 8th January 2012, 01:28 PM

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.

8th January 2012, 10:21 AM	#2
hidnplayr diyAudio Member Join Date: Sep 2008	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. __________________ Real tubes have top-caps

8th January 2012, 10:52 AM	#3
radiostar diyAudio Member Join Date: Apr 2009	This amp has 450 V on plates and 400 on screen grids ... __________________ tubes.rs facebook.com/tubes.rs

8th January 2012, 10:52 AM	#4
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	1200vct is 600v per side, less rectifier losses, less choke losses, means the caps, while marginal, will be ok, e&oe... __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

8th January 2012, 12:13 PM	#5
CharleyW diyAudio Member Join Date: Aug 2002 Location: Arlington, TX	The rating for the caps on the primary is 600V - that's not the secondary voltage. __________________ Hey is for horses.

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8th January 2012, 12:19 PM	#8
denny9167 diyAudio Member Join Date: Nov 2007	Has anyone ever constructed this one,I like the use of a regulated power supply,I have several 6CB6A,and OA2 VR tubes.

8th January 2012, 01:28 PM	#10
brucetassin diyAudio Member Join Date: Dec 2005 Location: Loganville, GA	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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