by EWBrown » Wed Jan 02, 2008 1:21 pm
The DS-025 or FS-030 would be serious "overkill", I'd also suggest the TFA-204, or do what I did and use the "Robin Hood" RH-60.
It's a 5K primary, so the output power will be a bit lower (around 2.5W) and the THD will decrease quite significantly, and for $100 apiece MQ OPTs, these sound fantastic! I had always been a bit skeptical about "pricey" iron, but this definitely shows that there is indeed a difference. Even with the humble 13EM7, the BCP-15 and EXO-45 from MQ work sonic wonders...
The RH-60s are open frame construction, with a brass channel frame, and exposed solder tabs, so they do need some insulation - I used heat shrink tubing "condoms" over them after getting a rather nasty surprise of a 412VDC "bite" during tube-out initial testing.
/ed B in NH
Real Radios Glow in the Dark