E.I.S. (Trek II) Solid State Relay

[ATYFP]

After listening to/viewing this video over the past few years (http://www.youtube.com/watch?v=JzFdhfiDBRw), I have decided to add the EIS relay to my 147 amp. The Leslie "click" has become so pronounced in my recordings that I had to make this decision. Of course, the amp will no longer be stock; however, I get to have nice smooth transitions from chorale to tremelo.

Are there any issues I should consider when adding the EIS unit? Any stories about the longevity of these relays?

Thanks!

[torea]

We've had one in our modified 21H amp for about half a year now, played frequently to occasionally (depends on how much amp work I've got on my plate). Haven't had a single problem with it. I don't think ours is set up for anything but the standard tremolo/chorale.

Unfortunately the relay I put in my output box to switch both 147 and 122 types clicks 3 times as loud as the old Leslie relays :'( I need to get around to building a back to that box, maybe that'll shut it up.

[tonewheel1966]

They're bomb proof and were designed originally for stage and studio and have been selling for years. I had one in the past and will be getting another one when I return my 122 back to 122 from its current 147 config.

[kdm]

Installed one on my 147 several years ago, just recently converted to 3 speed by swapping out guts of the half-moon (adding a diode as per instructions). Went in easily. No problems, love it.

As for the amp not being stock, AFAIK it will look and act stock to a stock 147 kit and coexist with other 2 speed 147s. I think the only catch is that you can't mix a 3 speed switched leslie with one that doesn't have the EIS relay. Also, if you use a Leslie combo-preamp the stomp switch may need to be replaced or there may be switching issues. All this is explained in the instructions.

Ken

[ATYFP]

So, I now have the unit installed. Two things have been proven:

1) The unit works FLAWLESSLY, as there is no more relay click. SWEEEETTTTT!!!
2) I now need to clean my motors and tighten the lower rotor belt. (LOL) There's a slight "THUD" or "THUNK" type sound when I switch speeds.

The EIS relay is a good investment.

[torea]

So, I now have the unit installed. Two things have been proven:

1) The unit works FLAWLESSLY, as there is no more relay click. SWEEEETTTTT!!!
2) I now need to clean my motors and tighten the lower rotor belt. (LOL) There's a slight "THUD" or "THUNK" type sound when I switch speeds.

The EIS relay is a good investment.

Amen to that. I've said it before, if I had the cash (and the internal amp space) I'd have em in all our amps.

[kdm]

I get that same "thud" when switching from slow to fast, or slow to stop. In my case it's the slow motors returning to their "resting" position. Top stack is louder than the bottom. Time to check the springs on the armatures.

Never noticed it until I implemented three speed operation.

Ken

[tonewheel1966]

Try stretching the spring a bit for starters, or you can get a spring kit from tonewheel general. It is the upper slow motor that will be worst. I had this on my 760 and found there was a little buffer missing.

Cheers

Dave