11-04-2017, 07:59 PM
Hi Sam, Kalee has summaries it correctly.
There was a design for side by side bobbins in PW in the 60's but it was complex and probably didn't work too well.
Sectionalising is a good technique, but is expensive to do commercially. If you are going for a UL connection then you can wind A1 (Sec1) Sc1 - (Sec2) Sc2 (Sec3) A2. Join the ends of the 2 screen sections for the CT. This technique can be used for different speaker impedance tappings, but all windings should be in circuit at all times by series/ parallel connection.
There is lots on the web about this, but generally there should be N sec windings and N+1 pri windings. The famous Williamson amp had about 14 pri windings alone.
Ed
There was a design for side by side bobbins in PW in the 60's but it was complex and probably didn't work too well.
Sectionalising is a good technique, but is expensive to do commercially. If you are going for a UL connection then you can wind A1 (Sec1) Sc1 - (Sec2) Sc2 (Sec3) A2. Join the ends of the 2 screen sections for the CT. This technique can be used for different speaker impedance tappings, but all windings should be in circuit at all times by series/ parallel connection.
There is lots on the web about this, but generally there should be N sec windings and N+1 pri windings. The famous Williamson amp had about 14 pri windings alone.
Ed
