not too many toroid output transformers out there for power amps,
why? probably a lot of reasons, cost, need for a toroid winder and somebody to run it, large size, fab work needed for can and mounting,
but the main reason is the lack of a sufficient air gap to prevent any DC imbalance current from saturating the core,
however there are some good things about these cores that make an effort of this kind well worth it, low excitation current? that is certainly a plus but not something to worry about in a power OPT,
what about very low leakage inductance? these cores allow the wire to surround them very well, with an E-I lam, there is quite a bit of core (the legs) which has no wire around it, you can fake a toroid by using a U-I lam so that the two coils surround the alloy more completely, but there is no wire wrapped around the top and bottom of the core,
so a toroid core should make a great bass amp OPT as you get better coupling and thus more Henries for an incredible low frequency response,
somebody came into the shop the other day with an Eggnater Tourmaster guitar amp that had a blown pwr trans due to improper winding, this is a known factory defect for these amps, so we get a replacement at cost, boy, this transformer has about 30 leads coming out of it for the triple pwr range and international pri voltage options, plus low voltage winds for the solid state and logic, plus tube heaters, sheesh, what a pain to do the leads, but an OPT will only need 5,
so now we have a junk xfmr that came off the amp that we can use for our experiment,
do we want to unwind all those turns off by hand, hell no, that would take forever,
hack saw? getting too old,
so, we call up Uncle Dewalt and put on some ear goggles,
looks like a pumpkin, or Moe's hairdo,
grind til you see a few sparks, that would be the core,
why? probably a lot of reasons, cost, need for a toroid winder and somebody to run it, large size, fab work needed for can and mounting,
but the main reason is the lack of a sufficient air gap to prevent any DC imbalance current from saturating the core,
however there are some good things about these cores that make an effort of this kind well worth it, low excitation current? that is certainly a plus but not something to worry about in a power OPT,
what about very low leakage inductance? these cores allow the wire to surround them very well, with an E-I lam, there is quite a bit of core (the legs) which has no wire around it, you can fake a toroid by using a U-I lam so that the two coils surround the alloy more completely, but there is no wire wrapped around the top and bottom of the core,
so a toroid core should make a great bass amp OPT as you get better coupling and thus more Henries for an incredible low frequency response,
somebody came into the shop the other day with an Eggnater Tourmaster guitar amp that had a blown pwr trans due to improper winding, this is a known factory defect for these amps, so we get a replacement at cost, boy, this transformer has about 30 leads coming out of it for the triple pwr range and international pri voltage options, plus low voltage winds for the solid state and logic, plus tube heaters, sheesh, what a pain to do the leads, but an OPT will only need 5,
so now we have a junk xfmr that came off the amp that we can use for our experiment,
do we want to unwind all those turns off by hand, hell no, that would take forever,
hack saw? getting too old,
so, we call up Uncle Dewalt and put on some ear goggles,
looks like a pumpkin, or Moe's hairdo,
grind til you see a few sparks, that would be the core,