Need help finding a phono schematic for a conversion for a friend

Gunny · 7th January 2007, 01:21 AM

Got a friend who wants to convert a RCA Phono amp into a tube amp like I am with my Zenith. The chassis number is RS-171 and is a RCA the model number of the phono is SHP-7 The tube layout tag he took a pic of and sent to me and it has 2 6V6's and a 5Y3 Rectifier and 3 6CG7's. He said it has 3 transformers on it one large and two small? also the turntable had a switch that said mono or stereo yet the 2 12's and the two tweeters were all hooked together not separate like a stereo amp would be so that has me confused unless they had some simulated stereo function? Any one know where we can download a free copy of the schematic for this chassis? The amp does have all the volume tone controls so it is just not a power amp as it has the preamp section built in. Could the other tranformer be some sort of coupling transformer for a additional tuner that the tag said you could add on?

Gunny · 7th January 2007, 01:26 AM

Also the 6CG7 tubes were labeled first second and third A- F amps? Guess I never seen that before is that another way of saying preamp stages?

Gunny · 8th January 2007, 02:59 AM

Found a schematic at least on that is very close.

7th January 2007, 01:21 AM	#1
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Need help finding a phono schematic for a conversion for a friend Got a friend who wants to convert a RCA Phono amp into a tube amp like I am with my Zenith. The chassis number is RS-171 and is a RCA the model number of the phono is SHP-7 The tube layout tag he took a pic of and sent to me and it has 2 6V6's and a 5Y3 Rectifier and 3 6CG7's. He said it has 3 transformers on it one large and two small? also the turntable had a switch that said mono or stereo yet the 2 12's and the two tweeters were all hooked together not separate like a stereo amp would be so that has me confused unless they had some simulated stereo function? Any one know where we can download a free copy of the schematic for this chassis? The amp does have all the volume tone controls so it is just not a power amp as it has the preamp section built in. Could the other tranformer be some sort of coupling transformer for a additional tuner that the tag said you could add on?

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7th January 2007, 01:26 AM	#2
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Also the 6CG7 tubes were labeled first second and third A- F amps? Guess I never seen that before is that another way of saying preamp stages?

8th January 2007, 02:59 AM	#3
Gunny diyAudio Member Join Date: Jan 2006 Location: WI	Found a schematic at least on that is very close.