Tone Choke replacement

[Bushbaby]

Hi All
Another one of my many projects is working on an old Shaftesbury 'Ripper' Bass from the early 70s. However, when it was missing the tone choke /inductor coil which i need to replace. I would love to be able to get one like the original (see attached pics) which are small round type coils (I believe 2 attached in series) which have a value of 3 Henrys (yes it is this value). The nearest thing I have at present is an Xicon 42TL025 but that is just like a small square transformer which dosnt fit in well as I have no were to attach the body. Is there anything else I can use or will be a better fit?

Best Regards

Rob

[Ed_Dinning]

Hi Rob, some of the older style Mullard Ferroxcube/ RM cores should do. As there is little current and no DC lots of fine wire should get you what you need


Ed

[Kalee20]

I'd agree with Ed!

Smallest airgap in the range (but not zero gap, else inductance wanders excessively with time, temperature, whether the month has an 'r' in it, etc).

[Diabolical Artificer]

Had a look online -Mouser, Farnell, various vintage suppliers and could find nothing only DC chokes so as mentioned you'll have to wind your own probably. Some of the wah wah pedals used one winding of a small audio tfmr, might be worth looking at audio IP types but they'll be big.

Andy.

[Bushbaby]

I had a look at the Xicon 42TL025 on Mouser but you cant buy 1, the minimum order number is 1000!!

[ppppenguin]

Ed's solution of lots of fine wire on a ferrite pot core is the DIY solution. I've got a box of assorted pot cores but no idea as to which type(s) would best suit. The winding need not be in neat layers.

Or a small audio transformer, possibly recovered from an old transistor radio.

[Bushbaby]

Ed, has wound me a small coil which I am sure will be a great solution (thanks again Ed).
Time to remove the pickguard and rewire for the 3rd time. I am sure it will be correct this time around

Best Regards