Yamaha Leslie Amp - effects out

[tubesornothing]

A buddy wants to have an effects out installed in his Yamaha leslie RA200 amp.  In looking at the preamp, I see it has a typical SS preamp, then goes to an 3 stage active filter, before being passed to the power amps.  I am thinking to have the effects out after the coupling cap of the preamp, but before it goes to the 3 stage active filter.

Should this be a buffered effects loop?  Anything special I should consider since its solid state?

thanks
ToN



Here are some pics with an arrow indicating where I want it to go:

Lo-res:  http://tubesornothing.myphotoalbum.com/view_photo.php?set_albumName=album01&id=yamaha_leslie_preamp_001

Hi res: http://tubesornothing.myphotoalbum.com/view_photo.php?set_albumName=album01&id=yamaha_leslie_preamp_001&full=true

[PRR]

""The owner of this MyPhotoAlbum does not allow visitors to download their photos.""

? ? ?

> Anything special I should consider since its solid state?

Unlike tube grids, transistor Bases are, in general, NOT at zero volts DC.

That blocking cap assumes TR4 emitter biases around +8V, and TR6 TR7 bases are biased to about +16V. Your effects jack(s) must be at zero V DC. To build a full send-return, you must turn-around the first cap and add a second cap. For just a Send, there is another way to do it, but it comes to the same number of parts, so do it this way except the "return" is just fed from the Send.

[tubesornothing]

PRR - thanks very much.  SOrry about the photos, I thought they were publicly viewable.  I appreciate you digging one up. 

Thanks for the tip on the cap - that I would have never figured out.

Should I have any consideration for buffered/unbuffered?

thanks
ToN

[PRR]

> I thought they were publicly viewable.

Viewable, yes. But to mark-up the plan, it would be convenient to download the image so I could load it into an image editor. Instead it seems to want to sell me prints?

My work-around was "screen grab", but that's awkward.

http://tinypic.com/ is a good no-frill image host.