Comments on: Maestro PS-1B Teardown

By: Antoine

Antoine — Thu, 02 Dec 2010 05:56:46 +0000

Hello my friend,

I'm going to ask what you might find a stupid question, but does your pedal really work ??? According to the first picture that you provide, it seems that your circuit is missing one trim pot and a total of six resistors, when comparing with pictures of the interior of PS-1As that I collected from eBay listings. I also have the original schematic of the PS-1A/1B, and it really looks like your pedal is incomplete. Did you make modifications to the pedal ?

I have a defective PS-1B, and it is missing the exact same components as yours. I don't know if I should add the missing components...

Any clues ?

Thanks !

By: Team Roster

Team Roster — Sat, 30 Oct 2010 01:51:37 +0000

You you should edit the webpage name Maestro PS-1B Teardown | Grant Muller to more generic for your subject you make. I loved the blog post nevertheless.

By: Jimmy

Jimmy — Sun, 18 Apr 2010 16:14:20 +0000

Hello Grant, I have a Sunn 1200S 100 watt tube amp. The amp is quiet. The volume level at max seems about 1/2 or less of what it should be. Does this sound like a transformer? The components look very clean. Thanks, Jimmy

By: Grant Muller

Grant Muller — Tue, 26 Jan 2010 20:06:57 +0000

Great News Jimmy! I’m glad it turned out to be something simple.

By: Jimmy

Jimmy — Tue, 26 Jan 2010 18:17:20 +0000

Hello Again, Problem Solved ! Radio Shack had the 4001,4003 and 4004 but not the 4002. I found some NOS 4002′s, on eBay. Works like a charm. Thank you for your help. I owe you one ! Thanks, Jimmy

By: Jimmy

Jimmy — Mon, 18 Jan 2010 16:54:53 +0000

Hello Grant, Thanks for the information and quick reply. Yes, that is it. I looked up a photo and you are 100% correct. The part looks as if it has dried out and shattered with age. It does not look burnt. I will keep you updated on this. Thanks ! Jimmy

By: Grant Muller

Grant Muller — Mon, 18 Jan 2010 03:41:50 +0000

The 1N4002 is a ubiquitous diode actually, not a capacitor. I think you can even get these at Radio Shack for like $0.15, but Mouser and any of the online bad boys carry them too. To make sure you're looking at a diode, peek at it again and make sure that you see a solid bar on one side, this is an indicator of polarity. You might take a picture and send it to me so I can be sure we're talking about the same thing...

While this is an easy thing to replace it's usually an indicator of a different problem. I wouldn't be surprised if I put a new one in just to see it blow out again. It's worth the money though to at least give it a try, if it blows again you're only out the 15 cents or so, and you know that the problem is "upstream" of that (which I might be able to help you with.

Let me know,

By: Jimmy

Jimmy — Sun, 17 Jan 2010 20:30:42 +0000

Hello… Just above the 470 cap… there are 4 small caps?…. I have a ps-1a with one broken… it has 1N4 002 and GI on it…. Would you please tell me what it is, and how I might get one? Thanks, Jimmy

By: Inside The Korg DW-8000: Don’t Put Solder on a Battery | Grant Muller

Inside The Korg DW-8000: Don’t Put Solder on a Battery | Grant Muller — Wed, 18 Nov 2009 16:40:41 +0000

[...] 5 minute job”. I failed to take into account early 80s circuit construction. Sure, its no Maestro PS-1B, but I certainly discovered some “opportunities” upon cracking open the [...]