CJ

7591a OPT Push-Pull
« on: June 03, 2020, 06:58:45 PM »
this is from a Roland Bolt 60 guitar amp,

has a fet preamp and a tube output

did not dissect, used PRR method to get turns, plenty of room in the window for passing wire,

If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


CJ

Re: 7591a OPT Push-Pull
« Reply #1 on: June 03, 2020, 06:59:21 PM »
and another shot,
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: 7591a OPT Push-Pull
« Reply #2 on: June 03, 2020, 07:01:09 PM »
do not know who made it, lams seem to be metric but close to 100 EI,

running lots of Gauss to make 60 watts

probably closer to a 40 watt amp,

here is the print>
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: 7591a OPT Push-Pull
« Reply #3 on: June 03, 2020, 07:04:52 PM »
schematic since this is hard to find>

If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: 7591a OPT Push-Pull
« Reply #4 on: June 03, 2020, 07:21:47 PM »
sq wave on unloaded secondary>
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


 

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