Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on November 30, 2025, 10:23:11 am

Title: Testing an inductor coil
Post by: pbman1953 on November 30, 2025, 10:23:11 am

Is it enough to use a multimeter continuity test to test an inductor?

I have this Fender amp with 6 coils-


#1- no continuity
#2- 130 ohms
#3- 55 ohms
#4-32 ohms,
#5 -16   "
#6- 9     "
I have a feeling #1 is bad

Title: Re: Testing an inductor coil
Post by: kagliostro on November 30, 2025, 10:47:26 am

Usually NOT

Obviously if It results open it is a bad thing

You require a specific item

Someting like this

www.ebay.com/itm/176909809975?_skw=esr+meter (http://www.ebay.com/itm/176909809975?_skw=esr+meter)

Those items measures also impedency

Franco

Title: Re: Testing an inductor coil
Post by: pbman1953 on November 30, 2025, 10:52:45 am

Thanks!


 A question on the rebuild.


Should the v1B pin 3 resistor stay as is with the 1.5k or be replaced with a 680 ohm? I think on my last rebuild one of the forum members told me to do that


Thanks!

Title: Re: Testing an inductor coil
Post by: pbman1953 on December 01, 2025, 10:19:58 am

Any thoughts on my resistor question?


Thanks

Title: Re: Testing an inductor coil
Post by: Merlin on December 01, 2025, 11:12:59 am

Quote from: pbman1953 on November 30, 2025, 10:52:45 am

Should the v1B pin 3 resistor stay as is with the 1.5k or be replaced with a 680 ohm? I think on my last rebuild one of the forum members told me to do that

I don't see why it should be changed but you could use whatever value sounds good to you.