Results 1 to 8 of 8

Thread: Guyatone pickups

  1. #1
    Senior Member
    Join Date
    May 2006
    Posts
    3,839
    Thumbs Up/Down
    Received: 185/2
    Given: 19/0
    Rep Power
    18

    Guyatone pickups

    The other day, I was working on what I gather is a Guyatone guitar I picked up a few years ago. I'm assuming it's a Guyatone, based on the very distinctive pickups found on a great many Guyatone guitars, including a lap steel I have that I know is a Guyatone by the nameplate on the headstock.

    I had added a couple hundred extra turns on the bridge pickup to "heat it up", but the extra turns were a tad on the microphonic side so I needed to pot it. While it was apart, I snapped a pic, seen below. It has an interesting structure. You can see that it has a soft iron baseplate, whose "sides" bring the bottom pole of the bar magnet up at the sides. Tghe bent sides do not extend up as far as the top of the coil, the way they do on a classic gold foil. But, unlike some of the "economy" Strat pickups I have with a ceramic bar magnet on the bottom (and a Kent Armstrong I have as well), this magnet isn't simply glued to the bottom flatwork of the pickup. The bottom plate is used to extend the field outwards. The result is that, even though the stock unit has a DCR of around 2.7k, it's still pretty meaty-sounding. I should note that the shiny pickup cover is not ferromagnetic in the least.

    I'm becoming more and more convinced that ferro-magnetic baseplates are where it's at.
    Click image for larger version. 

Name:	5DBMJFt.jpg 
Views:	198 
Size:	422.9 KB 
ID:	53170

    1 Not allowed! Not allowed!

  2. #2
    Member
    Join Date
    Jun 2015
    Posts
    273
    Thumbs Up/Down
    Received: 23/0
    Given: 3/0
    Rep Power
    5
    Do you have a way to measure the inductance?

    0 Not allowed! Not allowed!

  3. #3
    Senior Member
    Join Date
    May 2006
    Posts
    3,839
    Thumbs Up/Down
    Received: 185/2
    Given: 19/0
    Rep Power
    18
    I have an inductance range on my meter, but I wouldn't bet the farm on it.

    0 Not allowed! Not allowed!

  4. #4
    Member
    Join Date
    Jun 2015
    Posts
    273
    Thumbs Up/Down
    Received: 23/0
    Given: 3/0
    Rep Power
    5
    The walled, ferrous base plate probably increases the inductance by a good fraction. But I would bet that the eddy current attenuation caused by both the cover and the metal base probably have a lot to do with giving it a beefy tone. I felt the same way about the Burns TriSonics, and they too have a low inductance, very low Q.

    0 Not allowed! Not allowed!

  5. #5
    Member
    Join Date
    May 2017
    Posts
    40
    Thumbs Up/Down
    Received: 7/0
    Given: 0/0
    Rep Power
    0
    Thanks for the picture, it's always nice to see the guts of those old pickups. I assume that magnet is ceramic? Those designs seem to need a strong-ish magnetic field to balance out nicely.

    0 Not allowed! Not allowed!

  6. #6
    Member
    Join Date
    Dec 2015
    Location
    Ventura County
    Posts
    48
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Rep Power
    0
    My thanks to you for posting this as well. Seeing these old designs is really inspiring.

    0 Not allowed! Not allowed!

  7. #7
    Member
    Join Date
    Mar 2011
    Posts
    162
    Thumbs Up/Down
    Received: 1/0
    Given: 4/0
    Rep Power
    9
    Another thank you for this topic!

    Albeit the coil is not bobbinless, I also understand that like an attempt to copy the Tri-sonic structure and I'd be grateful as well to know its measured DCR / inductance (some regular Tri-Sonic's that I've here read 6.7k /1.9H for three of them and 6.5H / 2.43H for one of them, for the record. It matches @ +/- 10% the values published online here and there, except for mini-Trisonics which are obviously different beasts).

    Finally, as an hommage to the work done by someone else, I'd like to share this link: https://drowninginguitars.com/2012/0...-encyclopedia/

    1 Not allowed! Not allowed!
    Last edited by freefrog; 04-12-2019 at 06:48 AM.

  8. #8
    Senior Member
    Join Date
    May 2006
    Posts
    3,839
    Thumbs Up/Down
    Received: 185/2
    Given: 19/0
    Rep Power
    18
    Wow! Thanks a batch for that. I probably have a number of those (well, a few....it's a LONG list at that site) in my to-repair-and-try-out bin. I have a copy of Dave Hunter's Guitar Pickup Handbook, but the vast majority of what's on the linked-to page is not included in his book.

    The pickup I disassembled looks like the Crestwood pickup, but is half the listed DC resistance. I have a pickup that appears to be the same (at least cosmetically) to this one: https://drowninginguitars.files.word...heit-6-11k.jpg The coil was damages and I had no idea what sort of DCR I should aim for in rewinding it. Now I know, so thanks!

    1 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Guyatone Bass Man ??? output impedance
    By drlowlow in forum Vintage Amps
    Replies: 3
    Last Post: 09-08-2009, 03:02 PM
  2. Guyatone pre-amp micro pedal request
    By KHKWORKS in forum Guitar Effects
    Replies: 0
    Last Post: 03-04-2009, 04:09 AM
  3. Guyatone VT3 schematic
    By wyovly in forum Guitar Effects
    Replies: 4
    Last Post: 02-25-2009, 11:53 PM
  4. Guyatone amp issues
    By CarlZ in forum Maintenance, Troubleshooting & Repair
    Replies: 9
    Last Post: 01-16-2008, 08:00 PM
  5. Guyatone GA-630
    By DinosaursoupMan in forum Other Amps
    Replies: 2
    Last Post: 06-12-2006, 03:02 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •