D***it!
Today I disassembled the PHILCO 20 speaker transformer, which I mentioned before in a different topic, looking for a lucky torn wire of the primary. When I finished cutting the waxpaper right over the "broken" lead, I noticed a small black spot on teh paper, that looked burn. I buzzed it, and it buzzed to the rest of teh primary.
Which means - I have to re-wind it or to look for a new one (I'd prefer the latter - I was never good with winding things).
Does anyone know where I can either get a XFMR (I need for PHILCO 20 version, with centertap), or restore the old one?
My best, Mike
You already know the specs on the transformer from voltage readings on Philco's service data. There's a company in Grand Haven, Michigan: Heyboer Transformer Co. While I have never had them do one for me, they will wind a new transformer for you to your specs. Best to measure the old coil, the core leg that passes thru the coil, the "windows" in the core stack, where the coil occupies, and the thickness of the core stack. Using this data, check with Hetboer, and see what a new coil will cost. It's going to be a good bit more than $25.00, but if you want a good transformer, it's the way to go.
Lots of luck.
Doug Houston Wrote:You already know the specs on the transformer from voltage readings on Philco's service data. There's a company in Grand Haven, Michigan: Heyboer Transformer Co. While I have never had them do one for me, they will wind a new transformer for you to your specs. Best to measure the old coil, the core leg that passes thru the coil, the "windows" in the core stack, where the coil occupies, and the thickness of the core stack. Using this data, check with Hetboer, and see what a new coil will cost. It's going to be a good bit more than $25.00, but if you want a good transformer, it's the way to go.
Lots of luck.
Heyboer are good people and can duplicate most anything. Don't even think about $25, though.
Are you wanting an original looking/fitting one, or one that will do the same job? There's a big price spread.
Hey guys, thanks for the advice.
I actually have teh original hardware and it is in good shape - only teh winding job has to be completed, possibly using the same bobbin.
I don't have teh XFMR data, but I am sure there is a datasheet somewhere (I thought I saw someone listing XFMR data for PHILCO). If you know exact place where the data can be found - I'd appreciate teh poitner.
I will give the Heyboer a buzz.
I would not go for a custom wound transformer, that is not necessary. You can purchase a new Hammond center tapped output transformer with a 5-7 watt rating and place it right inside the metal casing of the original output transformer, and re mount it right back on the frame of the speaker. Ihave done this many times with Philco 70 speakers. You have already drilled out the rivets to get the transformer case off; use some machine screws to remount it after rewiring the new leads to the correct points. It works great and costs about $20 or less. The Hammond product line as sold by Radio-Daze in Rochester, NY comes with frame dimensions (check the website) so you can get one that is the right physical size.
Mike AB3CX
Mike
thanks, I thought about it - I've spoken to Radiodaze and they did indicate that they sell something that could do; I looked at a universal Hammond xfmr that will provide a close enough to 1:100 ratio using certain taps.
My speaker had no rivets - the xfrmr was screwed down. Hammond will in fact be a bit cheaper option for me than using Heyboer - they quoted the price anywhere between 30-50 dollars to re-do the primary winding if I take it off myself and cout the turns. Kind of too steep.