Mesa-Boogie speakersim.?

[Johan]

has anyone tried the speakersim that sits in the old MesaBoogie studio preamp?
I've heard good things about it but havnt tried it yet. its a passive design with only a couple of resistors and caps but what appearantly sets it appart from others is an inductor ( wich is why i didnt just put one together and tried it yet..)
this inductor supposedly makes it much more convincing and I guess it makes sence in a way..LRC-filters are much more complex than simple RC-filters...
I see no reason this wouldnt be a very simple, effective and usefull project, so as soon as the hollidays are over, I'll chase down that inductor..

Johan

[Arno van der Heijden]

Maybe you can substitute the inductor for an opamp based gyrator?

[Eb7+9]

... you may wanna check out the MESA rec-out circuit found in the DC-3 - it's very stand-alone friendly - and will give a deep notch ...

... the input is taken off the output of the preamp and the circuit itself has little gain  ... just replace the gnd, -15v, -30v lines by +15, gnd, -15 ... adjust gain levels or stick a 10kLOG volume pot at the output accordingly ...



... compare to Triaxis and V-Twin rec-out versions on this page : http://www.tubefreak.com/mesa.htm

... jc

[Johan]

thanks
I kind of like the passive designes thou. has had better luck with them than with the active designes. I've been using huges&kettners "red box" for years and allways thought it sounded better that all the active designes I've seen ( marshall, dod, and so on..) and a someone said the mesa one sounded even better..
http://www.tubefreak.com/studio2.gif  "recording out"
http://www.tubefreak.com/mk4-4.gif  above the phace inverter...

real simple...and a 0,22H coil is probably much easier to find than a 1H that sits in their active design..

Johan

[william]

You can actually purchase the 1H inductor from mesa.  I've spoken to their parts people a few times about doing it.