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mike hadley's Discussions

agc transformer

Started this discussion. Last reply by Brad Winder Jun 12. 4 Replies

Working on my Phantom I decided to remove and replace the caps in the agc amplifier transformer. When I removed the transformer I found that the coil was damaged with half of the winding missing and…Continue

re cone a phantom speaker

Started this discussion. Last reply by David C. Poland Mar 23. 2 Replies

I have a Magnavox speaker from a Scott phantom to repair,it is fitted…Continue

Making a field coil speaker

Started this discussion. Last reply by mike hadley Jun 13, 2021. 3 Replies

After rebuilding both permanent magnet and field coil speakers the next step for me was to build a field coil speaker from the bottom up,besides there is an awful lot of radios out there without the…Continue

30 into 23 will go

Started this discussion. Last reply by Thomas Day Sep 24, 2019. 3 Replies

I thought that I would like to share the last installment of my Philharmonic,the cabinet started life as an Allwave 23 Tasman, but the radio has sadly long gone, and there was some horrible…Continue

 

mike hadley's Page

Latest Activity

mike hadley replied to RR-303's discussion what base is this?
"Hi Kimi, As Dave already mentioned unfortunately there are too many differences between the AW23 speaker and the Philharmonic, you really would be better off finding the correct speaker or making a adapter for a more modern type, maybe you could do…"
Sep 11
mike hadley replied to RR-303's discussion what base is this?
"I made a speaker substitute box for my philharmonic a few years ago, you don't have to make something as elaborate but this works https://ehscott.ning.com/forum/topics/philly-speaker-substitute I'm using a generic 15" PM speaker."
Sep 7
mike hadley replied to RR-303's discussion what base is this?
"The scanner doesen't need to be 3d, an ordinary document scanner will do or a reasonable drawing, once in the cad package the dimensions are easily changed to fit."
Sep 6
mike hadley replied to RR-303's discussion what base is this?
"Do you have a scanner? I could arrange to laser cut replacements Mike"
Sep 6
mike hadley commented on Bret Menassa's blog post Philharmonic cabinet near Little Rock
"I get the hint, I have a mold let's see if I can do anything."
Aug 25
Brad Winder replied to mike hadley's discussion agc transformer
"Wow! Amazing work!!"
Jun 12
Alex R. Whitaker replied to mike hadley's discussion agc transformer
"Very, very nice work.  I loved the technical data you provided.  "
Jun 7
Scott Seickel replied to mike hadley's discussion agc transformer
"Excellent Mike, as usual. "
Jun 6
David C. Poland replied to mike hadley's discussion agc transformer
"WOW!!   nice info, Mike"
Jun 5
mike hadley posted a discussion

agc transformer

Working on my Phantom I decided to remove and replace the caps in the agc amplifier transformer. When I removed the transformer I found that the coil was damaged with half of the winding missing and the last repairer had tried to fix the problem, the lefthand winding is in a very poor state.I thought that this would give a good opportunity to provide some information…See More
Jun 5
David C. Poland replied to mike hadley's discussion re cone a phantom speaker
"Nice presentation. That same speaker is used for the Scott model Sixteen and the 14 tube Scott Masterpiece and 19 tube Phantom (NOT 20 tube Phantom DELUXE, nor FM Phantom Deluxe). It uses a curved cone. Octal plug. It has two field coils - one…"
Mar 23
Brad Winder replied to mike hadley's discussion re cone a phantom speaker
"Awesome tutorial Mike! I have started to learn to re-cone speakers, having done three smaller ones so far. Two turned out well...one not so good. But I will keep trying, and use a couple of your tips. :)"
Mar 22
Brad Winder liked mike hadley's discussion re cone a phantom speaker
Mar 22
Scott Seickel liked mike hadley's discussion re cone a phantom speaker
Mar 22
Fran Mayer liked mike hadley's discussion re cone a phantom speaker
Mar 22
mike hadley posted a discussion

re cone a phantom speaker

I have a Magnavox speaker from a Scott phantom to repair,it is fitted with a HF dispersion cone that will have to be removed, this is done by undoing the screw and washer that holds it to the pole piece. Looking at the photo you can see that the…See More
Mar 22

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Comment Wall (2 comments)

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At 6:29pm on February 28, 2020, mike hadley said…

Thom;

Thank heaven for Hammond, my Mcmurdo v had the tone stack hacked out, long before the set came into my possession, I ran the tone schematic through ltspice to get the inductor values, Mouser provided.

I now have accumulated parts to build the combined psu and amp, luckily I have enough bench supplies to prove the radio is working.

I quite often find that if you keep chipping away, rather than tearing into a project, it allows thinking time. This helps to find the best way around a problem.

And as you know I found a way around the seven pin socket problem for my Philly a while ago.

Mike

At 5:27pm on February 28, 2020, Thomas Day said…
Mike: Nice power supply. I can source a similar used Heathkit supply here on Ebay.
I worked for them from 1967 thru 1974. I left in 1975. Here, Hammond transformer company makes suitable transformers for tube equipment at reasonable prices. I also have several Hammond organ Leslie amplifiers that have a balanced input. Since I would also need 6.3 volts at 5 amps for the filaments, a complete transformer supply would be better. When I bought my Allwave 23, the one question I didn't ask was does it work? The answer as I found out was no. The power transformer had a shorted winding. Thru this list I was able to find a company in Michigan that could wind a new one. Took several months, and since we go the Muskegon Mi. in October, and the company is on the way, I was able to pick up the new one. Minor construction differences required a custom mount, but it works just fine. For my needs, I would only need the tuner B+ and -20 volts for the bias circuits. I would also need to source the 7 pin socket to match the tuner plug. Since it is different from the standard 7 pin, that could be hard to find. I enjoy your posts on restorations.
 
 
 

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