BTMB Maggie

[thesmokingman]

Because Magnatone

 

[ProfMagpie]

Miss my 260...Please do this.

 

[Robert]

A Magnavibe-style circuit would be easy enough but I don't know what's going on different in the Maggie.

I'd need an original to compare, I haven't seen any available for a while.

 

[jubal81]

I believe it uses JFETs as voltage controlled resistors, which could be tricky. Don't think they set up as differential stages, either.

I had one for a short time and didn't really like it. Audio quality was OK. Not much distortion. Problem was it didn't sound like the LFO was balanced and perhaps the range of variable resistance was too high. It more resembled the seasick, out-of-tune sound like a BBD vibrato rather than a Magnatone vibrato to my ears.
To me, the Magnatone sound is closer to a harmonic tremolo, but heavier on the phase shifting and lighter on the amplitude change. Possible my unit needed better adjusting. I didn't tinker with It other than taking a look inside.

 

[jubal81]

Looking at the gut shot some more, my best guess is it's probably close to being a pair of Phase 90s without the clean blend.

Lined up to be an opamp stage for each JFET. Center quad LM324 is the LFO. The two DIP8 opamps probably in/out buffers.

 

[Feral Feline]

I was just looking at the Maggie again today, thinking "wouldn't it be nice to..." — and lo, behold, a thread on the very topic.

Interesting.