Page 1 of 1
ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 12:04 pm
by wdelaney72
Which of the primary is the CT....Blue or white? I'd normally guess the white, but the dot by the blue is throwing me off.
http://www.classictone.net/40-18026.pdf
Re: ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 2:48 pm
by neikeel
Going by the schem on the link the white is the primary CT.
The black dot is probably referring to the 'start' of the wind being blue.
Re: ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 3:52 pm
by wdelaney72
Thanks, Neil.
So...does start of winding go to v4/5 or v6/7?
Re: ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 4:40 pm
by wdelaney72
I did get confirmation back from ClassicTone.
White is CT
The dot indicates polarity matches between blue on primary and black on Secondary.
Still not 100% clear in which goes to V4/5 with the 82K resistor out of PI and which goes to V6/7 with the 100K resistor.
From past experience I know having these backwards will screw up the NFB and cause power tube damage.
Re: ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 5:07 pm
by neikeel
Safest is build with over length wires to pin 3 make sure the polarity is correct and then dress wires to neat correct route. Heyboer seem to get it wrong quite often
Re: ClassicTone 40-18026 Primary CT
Posted: Thu May 22, 2014 11:44 pm
by wdelaney72
ClassicTone confirmed Red goes to V4/5 and Blue to V6/7.
We'll see if it's correct.