image
Screws-Nuts-Washers Lamps-Diodes-Channel Switching Screws-Nuts-Washers Transformers
Switches Wire-Cable-Heat shrink Tube Sockets Jacks-Plugs-Connectors
Wire-Cable-Heat shrink Tube Sockets Jacks-Plugs-Connectors Handles-Amp Trim Parts
Reverb tanks and Bags Pots-Knobs Jacks-Plugs-Connectors Tube Sockets
Switches Transformers Circuit Board Building parts Jacks-Plugs-Connectors
Pots-Knobs Resistors Fuse Holders-Cords-AC Items Wire-Cable-Heat shrink
Lamps-Diodes-Channel Switching Jacks-Plugs-Connectors Fuse Holders-Cords-AC Items Pots-Knobs
Pots-Knobs Screws-Nuts-Washers Tubes-Valves Chassis-Boxes
Pots-Knobs Foot Pedals Pots-Knobs Handles-Amp Trim Parts
Foot Pedals Tube Sockets Pots-Knobs Circuit Board Building parts
Misc Hardware-Grommets-Feet-Ring terminals Pots-Knobs Tubes-Valves Pots-Knobs
Fuse Holders-Cords-AC Items Jacks-Plugs-Connectors Lamps-Diodes-Channel Switching Switches
Misc Hardware-Grommets-Feet-Ring terminals Books Jacks-Plugs-Connectors Switches
Lamps-Diodes-Channel Switching Tools and Batteries Transformers Switches
Chassis-Boxes Pots-Knobs Tools and Batteries Capacitors
Tube Sockets Transformers Lamps-Diodes-Channel Switching Fuse Holders-Cords-AC Items
Fuse Holders-Cords-AC Items Capacitors Circuit Board Building parts Capacitors
Screws-Nuts-Washers Switches Foot Pedals Bike Light Parts
Tools and Batteries Handles-Amp Trim Parts Tubes-Valves Jacks-Plugs-Connectors
Fuse Holders-Cords-AC Items Tube Sockets Handles-Amp Trim Parts Tubes-Valves
Transformers Lamps-Diodes-Channel Switching Jacks-Plugs-Connectors Jacks-Plugs-Connectors
Wire-Cable-Heat shrink Screws-Nuts-Washers Tools and Batteries Resistors
Handles-Amp Trim Parts Circuit Board Building parts Lamps-Diodes-Channel Switching Tubes-Valves
Tube Sockets Tools and Batteries Resistors Tubes-Valves
Guitar Strings Misc Hardware-Grommets-Feet-Ring terminals Capacitors Transformers
Pots-Knobs Tube Sockets Capacitors Tube Sockets
Jacks-Plugs-Connectors Lamps-Diodes-Channel Switching Wire-Cable-Heat shrink Circuit Board Building parts
Resistors Bike Light Parts Jacks-Plugs-Connectors Misc Hardware-Grommets-Feet-Ring terminals
Pots-Knobs
You can scroll through the images above using the Image scroll controls or you can use the Left and Right arrow keys on your keyboard.

Hello, you are a guest in the Hoffman Amplifiers forum May 25, 2013, 10:43:01 pm
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Search Media Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: High Resistance Reading P90 pickups  (Read 347 times)
0 Members and 1 Guest are viewing this topic.
dynosoar1
Level 1
*
Offline Offline

Posts: 66


« on: January 02, 2010, 11:43:26 am »

I'm getting a reading of 20K and 18k respectively on my P90s.  Guitar is 1961 Gibby.  I'm measuring them from the guitar cable and not the leads directly, but I checked every other guitar i have and the method works fine.  Does this indicate broken pickups??
Logged
tubesornothing
SMG
Level 4
***
Offline Offline

Posts: 2666


A strong spark ought to bear calamities...


« Reply #1 on: January 02, 2010, 12:35:43 pm »

Somethings odd.  I measured my 56 goldtop the way you described and I see 9k and 8k.  4.5k with both on.
Logged
stingray_65
SMG
Level 3
***
Offline Offline

Posts: 932



« Reply #2 on: January 02, 2010, 01:35:55 pm »

Have you checked to see your volume setting?

how is the sound otherwise?

do you have a treble bleed cap? and does it have a shunt resistor?

what is the switch position? and does it run your pickups in series?

Just a few things off the top of my head that could give you an odd reading on an otherwise normal pickup.

however if it sounds different than you remember, you may have issues
Logged

My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention (H. Lamarr)
dynosoar1
Level 1
*
Offline Offline

Posts: 66


« Reply #3 on: January 02, 2010, 03:54:19 pm »

When volume pot is dropped to 1 or 0 it reads about 22 ohms.......reading is 75 kohms at half volume (5) and about 20k ohms at full volume (10).  Could it be a bad pot??  The pickup is functional and sounds ok, but I'm wondering if it would sound different if the possible issue was resolved?  I have only known what the pickup sounds like as it is now as its a recent acquisition.
Logged
jjasilli
Level 4
****
Offline Offline

Posts: 4154


Took the power supply test. . . got a B+


« Reply #4 on: January 07, 2010, 07:16:09 am »

Somethings odd.  I measured my 56 goldtop the way you described and I see 9k and 8k.  4.5k with both on.

Ditto for my '69 Goldtop (7.8K 8K & 4K) with controls dimed.  Readings drop to near zero with controkls at 0.
Logged
Geo
Level 3
***
Offline Offline

Posts: 1258


I'm actually caucasian.


« Reply #5 on: January 07, 2010, 03:34:25 pm »

When volume pot is dropped to 1 or 0 it reads about 22 ohms.......reading is 75 kohms at half volume (5) and about 20k ohms at full volume (10).  Could it be a bad pot??  The pickup is functional and sounds ok, but I'm wondering if it would sound different if the possible issue was resolved?  I have only known what the pickup sounds like as it is now as its a recent acquisition.

Could be a bad pot. Note how at half volume you get 75k ohms. At full volume you should get ~8k ohms, the coil's DCR. 20k is somewhere in between these. It looks like your pot is not quite rotating all the way. It may be stuck at say 80%.

If the guitar sounds fine, don't worry about it. ;)
Logged

When I was a kid we played cowpersons and native americans.......
Pages: [1]   Go Up
  Print  

 
Jump to:  


Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
This is the Hoffman amplifiers tube amp parts catalog, please choose a link below.
Amp trim/Handles Bike Lighting parts Board Building Parts Guitar Strings/Books
Capacitors Chassis/Boxes Foot Pedals Fuses/Cords/AC
Jacks/Plugs/connectors Pots/Knobs Lamps/Diodes/Channel Switching Misc. Hardware
Resistors Reverb Items Screws/Nuts/Washers Switches
Tools-Batteries Transformers Tubes/Valves Tube Sockets
Wire/Cable Public Parts list Page Search the Hoffman Amps parts catalog Non Stocked Parts
The Tube amp Library of information
Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photos, Sound clips.
There are hundreds of pages of Tube amp information on my library page.
Check out our huge library of schematics here

click here for more info