Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubenit on November 26, 2010, 09:32:57 am

Title: Parallele FX loop
Post by: tubenit on November 26, 2010, 09:32:57 am

Guys, I need some help. I'm within a few hrs of finishing my FX-Reverb outboard unit.

All 3 of these schematics have been posted and claim to be a paralleled FX loop. Anyone know which of these is actually correct ........OR can provide another one that shows how to do it?

Thanks, Tubenit

Title: Re: Parallele FX loop
Post by: Fresh_Start on November 26, 2010, 02:04:37 pm

#1 & #3 sure look like series loops to my eye based on the switch arrangement.  #2 might be a parallel loop but there's some odd local feedback going on.  Frankly, I think #2 is a mistake but could be wrong.

If you visit Loosechange's site, the FYD1 includes an effects loop which is switchable from parallel to series:
http://www.loosechange.freeservers.com/photo_1.html
Link to schematic is there.  This is close to O'Connor's "best tube loop" from TUT1 IIRC.

Hope that helps,

Chip

Title: Re: Parallele FX loop
Post by: topbrent on November 26, 2010, 02:05:19 pm

http://ampgarage.com/forum/viewtopic.php?t=10477

Not sure if you saw this thread over at AG.

Title: Re: Parallele FX loop
Post by: TIMBO on November 26, 2010, 02:07:18 pm

Here are two from Messa Boogie.I suppose they work!