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Solid State Musical Organ just hissing....

tedstruk

Jan 7, 2012
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I was wondering about solid state testing equipment, and scoping boards, when they are out of the circuit...
Most manufacturerers have equipment specifically designed for that.

This is a Gulbransen Equinox 2 musicomputer model 230 that refuses to make any noise other than a hiss that increases and decreases with the volume pedal...
What a grand organ machine this is, it is a rhythm section, full orchestra, vibrato, tremelo, reverb, and a leslie speaker all in a nice two keyboard package !
I don't even know how old it is...
 

Robert_fay

Jun 15, 2017
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Jun 15, 2017
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A hiss like a vacuum line leaking or an electrical hiss out of the speaker?
 

tedstruk

Jan 7, 2012
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The Gulbransen Equinox 2 Model 230 with the top down.. er up in this case.

Can't wait to see if I am any good at this stuff!

Any help with solid state diagnosis would be of invaluable assistance... how about a title for a good book under $20?IMG_20180905_131500388.jpg
 

kellys_eye

Jun 25, 2010
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Plug-in cards by the look of them. You will need the matching 'riser' card in order to access them for servicing.
 

Alec_t

Jul 7, 2015
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Just a controllable hiss level suggests that at least the pre-amplifier and main amplifier sections are working. I'd start by checking any fuses, and the supply voltage(s) to the plug-in cards.
The organ schematic and/or service manual would be handy.
 
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