Maestro - PS-1A Phase Shifter (197x)
- theehman
- Diode Debunker
Information
I have one of these on my bench right now and it has a bad 2N4302 on the output. Got some coming in tomorrow so hopefully that'll fix it.
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
- Bernardduur
- Transistor Tuner
Same problem as mine? LOLtheehman wrote:I have one of these on my bench right now and it has a bad 2N4302 on the output. Got some coming in tomorrow so hopefully that'll fix it.
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- pinkjimiphoton
- Transistor Tuner
Information
- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
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courtesy of fleabay!! i love it when they do this
dunno if they're good enough to work from, if anyone is interested (these things were kinda like "baby" mutron phasers)...hope it helps somebody out!!
dunno if they're good enough to work from, if anyone is interested (these things were kinda like "baby" mutron phasers)...hope it helps somebody out!!
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
Slava Ukraini!
- KindaFuzzy
- Degoop Doctor
that poor fish cap on the right looks a little rough.
- Dirk_Hendrik
- Old Solderhand
Information
To work for what? Tracing? Laziness is the first step in making life easier
I don't know this one but I did know the Shin-Ei clone variant which is rather close. I used above Maestro schem to get it running again. That was a phaser that did not exactly excite me.- Max Cohen
- Breadboard Brother
Information
I see if I can work out the replica board of this - shouldn't be a problem from the picts - time is indeedpinkjimiphoton wrote:courtesy of fleabay!! i love it when they do this
dunno if they're good enough to work from, if anyone is interested (these things were kinda like "baby" mutron phasers)...hope it helps somebody out!!
thanks for this
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- Dirk_Hendrik
- Old Solderhand
Information
I knew I had these somewhere but "hid" them in the wrong directory. These are the Shin-Ei version
- pinkjimiphoton
- Transistor Tuner
Information
- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks - Location: new world order land (formerly la-la land)
- Has thanked: 358 times
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- Contact:
dirk,
this is the resley tone? or are the pics mislabled?
the resley tone is definitely not one of these, this has only 3 preset switches and a bypass switch, i had one of these...jesus...when the hell was 91?
or am i confused ? (probable)
was, for what it was, a nice simple phaser. if memory serves, you could combine preset switches, too.
this is the resley tone? or are the pics mislabled?
the resley tone is definitely not one of these, this has only 3 preset switches and a bypass switch, i had one of these...jesus...when the hell was 91?
or am i confused ? (probable)
was, for what it was, a nice simple phaser. if memory serves, you could combine preset switches, too.
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
Slava Ukraini!
- Dirk_Hendrik
- Old Solderhand
Information
Resleymachine. Not tone.
This one:
If I remember correct, a little different in how the LFO was built and exactly the same in the phasing audiopath.
This one:
If I remember correct, a little different in how the LFO was built and exactly the same in the phasing audiopath.
- pinkjimiphoton
- Transistor Tuner
Information
- Posts: 1242
- Joined: 12 Sep 2010, 19:03
- my favorite amplifier: my own, a redesigned princeton
- Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks - Location: new world order land (formerly la-la land)
- Has thanked: 358 times
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- Contact:
sure looks about the same, indeed...thanks dirk!
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
Slava Ukraini!
I've made a clone of a Maestro PS-1A Phase Shifter. The board was fabbed by Haberdasher from the Madbean forum based on a layout found on the interweb, no idea who did it. The 2n5087 on the input is backwards on the layout, as are all 6 of the 2n5485s. The HA17458 opamps we got from Tayda work, which is good as others we tried didn't. Also I added the RF suppressing caps on the back of the board as it was picking up radio most impressively beforehand. Finally I wired as true bypass by jumpering the slow switch connections using Josh's (1776 Effects) Optotron. There's a little bit of a vol drop when engaged, but it doesn't mess with the signal when not in use now.
It needs a 12v feed currently, that then gets reversed by a Madbean Road Rage board to give the required -12v / +12v. I tried charge pumps and just couldn't get as good a result as with a proper 12V feed.
Links to the project:
Layout - http://juansolo.demon.co.uk/stompage/sc ... layout.png
Transfer - http://juansolo.demon.co.uk/stompage/sc ... ansfer.png
Maestro Schematic - http://juansolo.demon.co.uk/stompage/sc ... ematic.gif
Oberheim Schematic - http://juansolo.demon.co.uk/stompage/sc ... ematic.pdf
Oberheim designed the effect and their schematic is easier to read. Also it runs at +/-15v which will increase headroom.
Sound clip:
It needs a 12v feed currently, that then gets reversed by a Madbean Road Rage board to give the required -12v / +12v. I tried charge pumps and just couldn't get as good a result as with a proper 12V feed.
Links to the project:
Layout - http://juansolo.demon.co.uk/stompage/sc ... layout.png
Transfer - http://juansolo.demon.co.uk/stompage/sc ... ansfer.png
Maestro Schematic - http://juansolo.demon.co.uk/stompage/sc ... ematic.gif
Oberheim Schematic - http://juansolo.demon.co.uk/stompage/sc ... ematic.pdf
Oberheim designed the effect and their schematic is easier to read. Also it runs at +/-15v which will increase headroom.
Sound clip:
Found the fella who did the layout over on DIYSB. He's got an updated version of the layout here with the correct orientations:
http://www.aronnelson.com/gallery/main. ... alNumber=2
http://www.aronnelson.com/gallery/main. ... alNumber=1
http://www.aronnelson.com/gallery/main. ... alNumber=2
http://www.aronnelson.com/gallery/main. ... alNumber=1
Hi,
I recently bought a Maestro PS1A and although it is working it is not without some issues.
I noticed that in bypass when using humbucking pickups (Gibson SG) that it distorts, but when in effect mode, this does not happen, or at least it is not as drastic.
I also noticed that when switching in and out of the effect there is a noticeable “ffump” sound, almost like the signal ramping up.
Tapping on the box sometimes produces a popping sound. I am guessing a loose solder joint somewhere.
This pedal is almost 50 years old and all parts look to be original so I don’t expect it to be noise free or without its quirks. I just wanted to know if the “issues” that I have come across are indeed actual problems or they are just part of an old design.
That aside, this thing sounds great. I have several phasers and this brings something new to the table.
Thanks,
Robert
I recently bought a Maestro PS1A and although it is working it is not without some issues.
I noticed that in bypass when using humbucking pickups (Gibson SG) that it distorts, but when in effect mode, this does not happen, or at least it is not as drastic.
I also noticed that when switching in and out of the effect there is a noticeable “ffump” sound, almost like the signal ramping up.
Tapping on the box sometimes produces a popping sound. I am guessing a loose solder joint somewhere.
This pedal is almost 50 years old and all parts look to be original so I don’t expect it to be noise free or without its quirks. I just wanted to know if the “issues” that I have come across are indeed actual problems or they are just part of an old design.
That aside, this thing sounds great. I have several phasers and this brings something new to the table.
Thanks,
Robert
- TWSpedals
- Breadboard Brother
You may need to replace all the electrolytics. They are getting to the age were they start to fail.rsado wrote: ↑13 Feb 2021, 17:24 Hi,
I recently bought a Maestro PS1A and although it is working it is not without some issues.
I noticed that in bypass when using humbucking pickups (Gibson SG) that it distorts, but when in effect mode, this does not happen, or at least it is not as drastic.
I also noticed that when switching in and out of the effect there is a noticeable “ffump” sound, almost like the signal ramping up.
Tapping on the box sometimes produces a popping sound. I am guessing a loose solder joint somewhere.
This pedal is almost 50 years old and all parts look to be original so I don’t expect it to be noise free or without its quirks. I just wanted to know if the “issues” that I have come across are indeed actual problems or they are just part of an old design.
That aside, this thing sounds great. I have several phasers and this brings something new to the table.
Thanks,
Robert
There is a trimmer that sets a bias point near the output, this may need to be adjusted to remove any DC offset causing that "thump".
Have a nice day!