DynaSonic turn count

[Peter Naglitsch]

Sorry to hear 'bout your father-in-law.

I really like this design. It reminds me of the Gibson Staple p'up, which I LOVE the sound of.

Good luck with it, it looks like a wholelotta work to do!

Thanks Pepe. Iäm starting to get back to normal life now.

I *think* that Seth Lover was inspired by the DynaSonics when he did the Staple pickups. Or the other way around. Anyway, they are very similar in construction.

[madzub]

probably not what you're going for, but i just thought i'd throw this out there: If you want a very similar but much simpler pickup to the Dynasonic, take a P90 bobbin and use alnico slugs. You can simply push the slugs up or down to adjust the height, so you needn't bother with all the crazy mechanics of the Dynasonic. Ya, I know you're going for the Dynasonic look, and yes the p90 with alnico slugs is going to sound a bit different, but it's an idea that'll get you in the same realm much more easily.

[soundmasterg]

Yah I've got a vintage set of those Possum....got them off ebay a couple years ago. I'll see if I can find the specs that I wrote down and post them, and if not, I'll test the pickups again and post the specs. Sometime this weekend.

Greg

[Peter Naglitsch]

If you want a very similar but much simpler pickup to the Dynasonic, take a P90 bobbin and use alnico slugs.

Yeah I know, I have done that. I had a customer that had a set of these installed in an old European archtop. I ripped out the steel poles and the bar magnets and installed 6mm alnico rods + did a rewind to get them into the tele meets P90 realm. A sound that worked really good for that guitar.

I have all the parts made now, including the mechanism (a bit of cheating here and there, but hey, I call it a prototype... Will publish pics later on.

Edit: Pics are here

[Peter Naglitsch]

OK, with the 44 wire I did 8250 turns for the bridge pickup and ended up with 11.45K. so I think that I'm getting pretty close to what I will end up using in the end. The sound is still a bit on the thin side compared to the full and fat sound of the neck (and surprisingly a bit weaker in terms of output, that part makes me a bit confused...) so I will probably try to add a few hundred turns.

EDIT (OK, lots of edits, sorry for that) I toot the bridge up to a full 9000 turns until it banlanced the neck pickup in sound and output. The DCR is now 12.24K so anyonme shooting for vintage accuracy might try 8-9000 turns for a start as long as no one else chip in with the real numbers

[David Schwab]

...cannibalizing a set of GFS for the frames

I see GFS has a version in regular humbucker frames.

GFS Surf 90 Alnico II Rockabilly Pickups

You can the DeArmond/Rickenbacker style frames from here:

http://www.gnbpickup.com/

In fact they make one that looks like this:

[Peter Naglitsch]

I used a set of these to get the right look. I just gutted them totally and user the rims. Pretty expensive covers

The GFS Surf 90 are probably exactly like these G & P pickups I got from an European source

when getting the order for this guitar (thinking naah, I won't go through the trouble trying to make DynaSonics myself). If so they are nothing like DynaSonics. I examined the once I got and they are standard single coils, wound directly around the magnets. The screws are placed outside of the coil and are only there for the looks. And in the text he refers to the screws as being there to adjust the magnetic field... OK, to be honest the screws probably helps the magnetic field a bit on its way "back to the strings" as the gauss is much higher above the screw head than at the corresponding place on the other side of the coil. But however you slice it they are more or less a fake. And they don't sound too good either

I checked out the G&P website but couldn't find anything about parts. Have you bought parts from them? If so, what about minimum orders?

[David Schwab]

I checked out the G&P website but couldn't find anything about parts. Have you bought parts from them? If so, what about minimum orders?

G&B. I'm in the process or ordering a couple of hundred bass pickup covers with my logo on them. So far they have been very pleasant to work with, and they accept PayPal! The person to ask for is Rey. That's probably the person who would get to you anyway in English.

I don't know if they have a minimum order requirement. They didn't mention it, but very small orders will kill you on the freight charge. Same with SensMag... 100 ceramic magnets will cost $60, but then the freight is also $60!

The larger orders the freight charge increases at a much slower pace.

[soundmasterg]

Sorry it took me so long to post on these. Had a busy weekend and forgot to check the pickups!

Greg

PICKUP 1

DCR =11.6k
Inductance @ 120Hz = 3.554 H
ACR @ 120Hz = 11.65k
Q @ 120Hz = .2337
Capacitance @ 120Hz = 475.5 nf
Inductance @ 1k = 3.372 H
ACR @ 1k = 15.31k
Q @ 1k = 1.39
Capacitance @ 1k = 7.46 nf

PICKUP 2

DCR = 11.73k
Inductance @ 120Hz = 3.589 H
ACR @ 120Hz = 11.76k
Q @ 129Hz = .2343
Capacitance @ 120Hz = 470.5 nf
Inductance @ !k = 3.343 H
ACR @ 1k = 15.19k
Q @ 1k = 1.388
Capacitance @ 1k = 7.522 H

[Joe Gwinn]

Sorry it took me so long to post on these. Had a busy weekend and forgot to check the pickups!

Greg

PICKUP 1

DCR =11.6k
Inductance @ 120Hz = 3.554 H
ACR @ 120Hz = 11.65k
Q @ 120Hz = .2337
Capacitance @ 120Hz = 475.5 nf
Inductance @ 1k = 3.372 H
ACR @ 1k = 15.31k
Q @ 1k = 1.39
Capacitance @ 1k = 7.46 nf

PICKUP 2

DCR = 11.73k
Inductance @ 120Hz = 3.589 H
ACR @ 120Hz = 11.76k
Q @ 129Hz = .2343
Capacitance @ 120Hz = 470.5 nf
Inductance @ !k = 3.343 H
ACR @ 1k = 15.19k
Q @ 1k = 1.388
Capacitance @ 1k = 7.522 H

Be aware that the two "capacitance" readings are meaningless, resulting from misleading the LCR meter.

LCR meters measure the complex impedance at the test frequency, and compute L-and-R or C-and-R or R-alone according to which circuit diagram the user selects with the PAR/SER and L or C or R buttons.

[RedHouse]

...you can the DeArmond/Rickenbacker style frames from here:Áö¾ØºñÇȾ÷(ÁÖ)

Two months and 6 emails they (G & B) still wont answer my emails, not a great source IMHO.

[David Schwab]

Two months and 6 emails they (G & B) still wont answer my emails, not a great source IMHO.

Really? I'm still waiting for my parts, but I did get emails from them. The last email was exactly a week ago.

They were in Germany for the show.

[RedHouse]

Really? I'm still waiting for my parts, but I did get emails from them. The last email was exactly a week ago.

They were in Germany for the show.

Ill send another today, but I'm not holding my breath.

___________________________________________________
{Edit} well this would explain things:

The original message was received at Fri, 23 Apr 2010 00:24:43 +0900 from [210.205.11.119]

----- The following addresses had permanent fatal errors ----- <gnbpickup@gnbpickup.com>
(reason: 550 5.2.2 'gnbpickup#gnbpickup.com' quota full)

----- Transcript of session follows ----- ... while talking to local:
>>> DATA
<<< 550 5.2.2 'gnbpickup#gnbpickup.com' quota full
554 5.0.0 Service unavailable ('gnbpickup#gnbpickup.com' quota full)

Any other email address for them David?

[soundmasterg]

So does that mean that all measurements with the Extech for capacitance are meaningless, or just that you need to know the conditions of the test to qualify the capacitance measurement?

Greg

[David Schwab]

Any other email address for them David?

No, thats the only one I have. I haven't heard back from him yet, but my email also didn't bounce.

I notice he usually responds to email at like 5:30 am!

A luthier that I make pickups for ordered a bunch of covers from them and got them with no problems, but he did say the amount of communication he got from them was on the light side.

By contrast, Marilyn at Sensmag always gets back to me right away.