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LoL! I was looking at the supplied bobbin holder and thinking "that won't make a Christmas tree choke". Do you have a photo of the setup for such? Nothing like hand power for rapid response to a

Pi chokes use a universal wdg to minimize shunt C and need "shoes" or sheaves to hold pi in place till varnished. In 1950s a mechancal winder was made for such use, no motor, hand crank. Those still

The eBay coil winder arrived today and I'm really pleased. I'm sure there will be issues learning to set it up properly as the "manual" is 1/2 page of text, but for the price I'm quite delighted. A

ROFL! I forgot to mention that dead CD/DVD drives are perfect for moving the wire feed. So the choice is: Spend money on COTS or Acquire Arduino embedded system skills at 5th grade level Which

Thank you Reg, Jon and others, Apologies, have not come to any conclusions yet: There seems to be all sorts of coil winders on eBay at an affordable price range of $30 to $100, which is the ballpark

We bought the excellait Adams-Maxwell machines, for $300..850 in USA. Look for used machines in EU from Micafil, Switzerland Jon

Just?so?we?are?all?clear?on?this.??If?anyone?sends?me?a?technical?query?related?to?a?list?topic?to?which?I?reply,?I?will

Rick, Replying to the list as I want to capture this in the archive. First thought is build a coil winder. https://www.ebay.com/itm/382128211265 I just ordered a copy. It's one of the few Gingery

Jon, I am not interested in debating the merits of whether to use twisted or not. The sole purpose of this thread is to demonstrate the mechanism I built for making custom parallel

Reginald here is the bifilar wire in our stock, 2X#29 solderable magnet wire twisted pair, and 2X #30 Kynar. These are used in many bifilar chokes, toroid's, etc. Twists minimize CM emission.

That is the photo on the cover of the 5th ed. I already have a complete stock of single filament magnet wire. For a hobby user buying rolls of multifilar wire doesn't make sense given the ease of

Interesting. That appears to be exactly the same photo as is on the cover of Jerry Sevick's book on baluns and ununs. DaveD

you want parallel multifilar wire, made in various numbers of conductors https://mwswire.com/specialty-wire/multifilar-magnet-wire/ Jon

This is the cover photo which prompted developing a way of making flat multifilar windings. There is not a single example or any discussion of twisted windings in the book. If you have citations

Hello again Bunched or twisted wires are used in magnetics as a low cost more practical alternative to Litz wire. Depend on the frequency and current density, the difference between bunched and litz

Someone should have told Raymond Mack and Jerry Sevick. One or the other went to a lot of trouble to keep the windings parallel instead of twisting them as shown in the cover photo of the 5th ed. I

Bravo, we used to just use a vise and electric or hand drill. no need for any coating if done properly in production we bought multifilar wire in 2..4 colors for ID of wdgs. MWS makes it. Jon

I took a break from organizing my shop to make this. I finally have a place to put things, so progress has been rapid. In 1/2 of the mess ;-( I made something similar out of a very light oak strip

Re: Heathkit SB-200, SB-220, SB-1000 & HL-2200 Linear Amps: any refurbishing would include Grounding the Grids in any of these Amps ! Yes, W8JI has excellent information. The R. Measures older

Before attempting to power tube circuits that have long been unpowered, it is advisable to "rejuvenate" the tubes and high voltage electrolytics. Residual gases poison the inactive cathode or heater