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Attempting to restore a Pioneer 202 spring reverb
Attempting to restore a Pioneer 202 spring reverb
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Old 30th October 2012, 03:07 AM   #1
Hallu is offline Hallu
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Join Date: Oct 2012
Default Attempting to restore a Pioneer 202 spring reverb

I'm looking to restore a Pioneer SR202 spring reverb unit. They were funky little boxes mainly used for 70s hifi equipment, but I'm wanting to use it as a noisy, sproingy effect for making music. It looks like this:

Click the image to open in full size.

However, I have a few things going on with it. When I run audio through it, without even using the spring effect, I'm getting overall tone drain with a lot of low end removed. When I turn up the reverb effect I lose more and more tone, and at full reverb I start to actually create lowly building feedback. NOT the noisy sounds I was wanting!

To start I was looking to replace the fuses, then test the power supply. Where should I go from there? I know its a discrete transistor design... I know enough electrical engineering to feel confident in being able to physically do all the repairs, and I know the general things that wear out over time (i.e. electrolytic caps and fuses) but since my EE skills have mostly developed around BUILDING things (mainly synthesizers and effects) I don't really have the mind of a repair tech. Any help or insight would be appreciated!
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Old 30th October 2012, 05:34 AM   #2
Moondog55 is offline Moondog55  Australia
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Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
Those are great sounding units.
Don't know why but I haven't used mine in a long while so I will be watching this thread just in case.
Oh that's right we haven't thrown a party at the new house so not yet taken out of the shipping boxes. LOL
QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"
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