Quick review on SD P-90 stacks

BlueGuitar

New member
I found a set at the local M&P music store so I figured what the heck... let's give them a shot!

I admit that I was skeptical after my experiences with the Gibson P100's (which are a stacked humcancelling pickup that resemble the P-90's physically but not sonically).

Well, the SD P-90 stacks sound pretty damn close to a real P-90, at least when you are using the bridge and neck pickups separately. When used together, the pickups don't get the sweet sound of a 56 Gold Top. (I even tried splitting the coils thinking that might help but it didn't.) But that's okay... you can get that particular sound with other P-90 guitars.

The P-90 stack comes with several different wiring options. As a humbucker you can wire it in parallel (for a traditional P-90 sound) or in series (for a 6dB boost, with more low to mid emphasis). You can also wire it in the Power Boost mode which is not humcancelling (I've used this option with other SD stacked pickups). And you can split the coils for still another tonality.

The two coils of the bridge stack measured 15.6k and 16.3k, which work out to around 8k in parallel mode. The two coils of the neck stack measured 10.3k and 10.4k, which works out to around 5.7k in parallel mode.

The P-90 stacks sound great but you might have a problem fitting them in your guitar. According to SD the cavity for the neck pickup should be at least 1.25 inches deep and the cavity for the bridge pickup should be at least 0.75 inches. With my 2004 faded cherry LP Jr Special doublecut I was able to temporarily install the pickups to test them out without doing any routing (I left the springs off and screwed the pickups down all the way). I liked the way they sounded so I then proceeded to rout out the cavities a bit; I wanted them to set low enough so that I had plenty of room for adjustments.

BTW I use a Craftsman 315.275120 Industrial Laminate Trimmer for routing out guitars since it is much smaller than a full-sized router.

One last thing... with the P-90 stacks being much deeper than regular P-90's they won't easily fit in a soapbar cover/baseplate. Although if you are industrious you might be able to get something to work...

Rating: One and a half thumbs up!
 
Re: Quick review on SD P-90 stacks

Great review Steve. I've wanted to try some P-90's for some time . . . but, one thing at a time. ;)

BlueGuitar said:
The two coils of the bridge stack measured 15.6k and 16.3k, which work out to around 8k in parallel mode. The two coils of the neck stack measured 10.3k and 10.4k, which works out to around 5.7k in parallel mode.

Just curious, did you measure this, or calculate it? Those parallel numbers should be cut in half. Lets say you have two 8k coils. In series they'ld be 16k, in parallel 4k. :)

Artie
 
Re: Quick review on SD P-90 stacks

ArtieToo said:
Just curious, did you measure this, or calculate it? Those parallel numbers should be cut in half. Lets say you have two 8k coils. In series they'ld be 16k, in parallel 4k. :)

The last time I checked the Federal courts hadn't repealed Ohm's Law... at least not yet! :saeek: I measured the coils individually after stripping the leads to make sure that everything was kosher. It was late at night so my math was off a bit (the two neck coils should add up to ~5.2k ohms in parallel- my bad!)
 
Re: Quick review on SD P-90 stacks

Cool thanks I keep thinking of dropping the stack bridge in my Special, but I love the sound of the Custom and I keep chickening out.
 
Re: Quick review on SD P-90 stacks

OK I am going for it, just ordered the bridge version from Blackrose. I am going to wire it in series for the fatter sound. Evan had suggested that to me a while ago but I got side tracked working on other projects.

Man if this works well I will be so psyched. My favorite guitar, my favorite sound and no noise, it will truly ROCK!!!!
 
Re: Quick review on SD P-90 stacks

Wattage said:
OK I am going for it, just ordered the bridge version from Blackrose. I am going to wire it in series for the fatter sound. Evan had suggested that to me a while ago but I got side tracked working on other projects.

Man if this works well I will be so psyched. My favorite guitar, my favorite sound and no noise, it will truly ROCK!!!!

Hmmm... I just put my Princeton Reverb back together after doing some mods so I was able to test the P-90 stacks going into a clean amp. They grind very nicely with overdrive but in a squeaky clean amp you can tell that they are not real P-90's. :( But still much better than the Gibson P-100's.

I went ahead and tried the series wiring- for the neck it was just too powerful so I switched that back right away. But with the neck in parallel and the bridge in series it's kinda strange because the neck is brighter. :smack:

In any case, I think that everybody should have one quitar with real P-90's in it and another guitar with the P-90 stacks for those times when the P-90 noise is just too much. I do think that the neck P-90 stack is a bit more authentic than the bridge version, both in series and parallel mode. I think the neck P-90 stack might work well as the neck position in a tele.
 
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Re: Quick review on SD P-90 stacks

Well that is kind of a drag, I am still waiting on mine to come in. Looks like a new P-90 guitar is about a week away as well so they'll go together and my Special will stay its cranky noisy old self :rolleyes:
 
Re: Quick review on SD P-90 stacks

Wattage said:
Well that is kind of a drag, I am still waiting on mine to come in. Looks like a new P-90 guitar is about a week away as well so they'll go together and my Special will stay its cranky noisy old self :rolleyes:

Let us know what you think of the P-90 bridge stack when you get it...

I've been swapping back and forth between my Gibson LP Jr Special with the P-90 stacks and my PRS SE Soapbar II with regular P-90's... I like them both!
 
Re: Quick review on SD P-90 stacks

Great write up!

I'm in the middle of a mod'ing a Gibson Flying V from the stock HB/HB set up to just a P-90 in bridge.

I want the P-90 sound but I'm worried about noise.
 
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