I used a 5 volt regulator on my MFJ 4225 to slow down the fan. This allows
the fan to start reliably at any voltage. I have run mine and my K2-100 this
way for at least 5 years with no problem on SSB, CW and DIGITAL.
73
Ken W0CZ
Bill NZ0T Wrote
<As I'm not a very technical person I just used a couple of resistors in
<parallel to slow the fan down in my 4225. I can't remember the values this
<early in the morning but it seems to be working just fine. The supply does
<run a little warmer but not hot and the fan is no longer heard.
<
<Bill NZ0T
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