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Rheem Mark VII organ

96.48.17.54

Posted on January 22, 2015 at 16:03:43
robmac63
Audiophile

Posts: 35
Location: vancouver bc
Joined: November 13, 2013

I recently purchased a non working Rheem Mark VII.I have Replaced the power supply caps and did a major cleaning.I also replaced the lytics on the vibrato board as well.
Also the back panel main output jack and level adjustment were badly corroded.so I replaced the output jack,haven’t replaced the level pot yet but resoldered it.I have cleaned all the keys and they work fine now.I am running the organ into a Gem el84 tube guitar amp.(I’ve had to keep the level control low to keep from overdriving the amp)
Some issues I’m having.
#1 When I turn on the vibrato I get a loud motorboating sound.
#2 when turning on any voice switches I get some static through the speaker as well.
#3 fuzz bass,solo bass,and brass voice don’t seem to be working and making some weird noises.

I have resoldered lots of the contacts as well
Thank’s for any help.
Rob.

 

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I just looked at the mark7 but not the schematic but, posted on January 22, 2015 at 21:52:00
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
I can tell you right now that you will no doubt need to tweak the coil on the vibrato board..The motorboating is an oscillation and humidity could have caused the coil to drift a bit and you just have to tweak it..Just go a half turn to 3/4 turn one way or the other and see if that cures it..Also,any of the old electrolytics on the boards should be changed..They are small values and they open many times or drift in value..I realized this was a solid state unit so I deleted my original post.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: I just looked at the mark7 but not the schematic but, posted on January 22, 2015 at 21:59:12
robmac63
Audiophile

Posts: 35
Location: vancouver bc
Joined: November 13, 2013
Great info Michael. There still are a few lytics I need to change out.
I will definitely try tweaking the coil.amazing how many parts were crammed into
These organs.
Btw nice goodwill find :)
Rob.

 

RE: I just looked at the mark7 but not the schematic but, posted on January 22, 2015 at 22:12:51
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
Thanks..
I can't get over how good it sounds..It reminds me of my old Nak OMS7II
I'm a vinyl guy all the way but I can tolerate this.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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