[Heathkit] SB 220

[Ernie Piche N1SW]

Does anyone have any experience with the Peter Dahl replacement xfrms 
for the SB 220.  I am afraid that I smoked mine during the Sweepstakes 
contest this weekend.  If you have experience with them, do they 
increase the amplifier output power?  What about duty cycle?  I believe 
the high speed CW with its high duty cycle is what smoked my 
transformer. What is the benefit of using an outboard one verses an 
inboard on.  Any help?

Thanks,
Ernie
N1SW