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Old 10th January 2007, 11:31 AM   #1
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Question Rose RV23 preamp

Hello Everybody
I have a Rose RV23 preamp that I'm trying to find a circuit of, it has an open circuit mains transformer and I need some output voltages to rewind it .
Any help,infomation or knowledge of this product would be greatly appreciated.
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Old 1st May 2012, 12:29 PM   #2
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Join Date: Feb 2010
I have repaired one just now for a fellow. The secondary output voltages from the tramsformer (I presume yours is external to the Rose like this one here?) ought to be (and I don't know, I'm going from how the thing looks inside the main amp case) 250v for the ECC82 valves and about 13v for the heaters, which are wired in series (that is, from valve pin 4 to pin 9, and only then to pin 5. There is also a voltage stabiliser chip and a NE555, which would require about 12-15 volts. But it must be 13 as the two series heater sections in the valves are 6.3v and 6.3v.
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