[ICOM] Heathkit SB 220

[Eric]

Hello,

Sorry for the off topic post but I am not sure where else to go to for 
help.  Here's the situation. I have an old Heathkit SB 220 that needs 
repair and probably some upgrading.   I was using it one time and 
something blew out, I think it was a choke under the tube socket..   I 
was going to sell it but have reconsidered and now I am going to try and 
fix it.   Does anyone know where I should start ?

Thank you,

Eric