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... __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report

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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