The Amp Garage

Id go Reactive instead. Much more accurate representation of how a speaker reacts than just using a resistive load. Pete Thorn did a great comparison vid of a handful of popular resistive and reactive loads. Pretty clear differences even via youtube... Hope it helps! https://www.youtube.com/watch?v=...

Thanks!

Hello all,

Does anyone have recommendations on a 6 position rotary switch to switch between coupling caps ala Matchless etc? Would an Alpha type work?

Thank you!

-Michael

Thanks Martin, That makes sense. I'll implement your design when my Mouser order arrives and see how it goes!

-Michael

Martin,

Do you have the VVR installed after R2 for a particular reason? it looks like our schematics are pretty similar (adding the dropping resistor into mine) except for that point. Thanks!

not yet. it will be before R2 after C1 as in my original schem. thinking outloud... maybe i'm off by a decimel... going off of voltages in the original SEL schematic i'd find the current across R3: (356-346)/1000 = .01A if i leave the VVR before R2 the V is 366 which is then sent to the preamp. So i...

Thanks guys. Looks like a 20k should do the trick.

Thanks Colossal. That was an incredibly fast reply!

For my own knowledge, where did you come up with the 18-22kOhm resistor value for R3a? Thanks!

-Michael

Hi Everyone, I've been lurking and learning for a while with this being my first post. I recently completed an Ax84 SEL build with the entire amp being scaled which has been working fine. I'd like to try scaling just the power amp. The original SEL schematics have the screens and part of the preamp ...