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mike hadley's Discussions

agc transformer

Started this discussion. Last reply by Brad Winder Jun 12, 2022. 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, 2022. 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 douglas wright's discussion Help needed
"Is the radio dead on all wavebands? have you checked that the local oscillator is running? have you checked the tubes to see if they are ok? (one of mine had a detached cathode) did you manage to get the wavechange cam back in the correct position…"
16 hours ago
mike hadley replied to douglas wright's discussion Help needed
"Hi Doug, 5v is way to low check the continuity of your field coil windimgs and the connections to and from your speaker plug. the aw15 has two windings, onr as part of the main ht filter, the other as the cathode load for the 2a3 output tubes here…"
Saturday
David Wilson replied to mike hadley's discussion homemade parts escutcheons bezels etc
"Absolutely amazing work on all this! "
Friday
John Chidgey replied to mike hadley's discussion homemade parts escutcheons bezels etc
"Hi Mike, Your work continues to be nothing short of amazing. John"
Friday
mike hadley replied to mike hadley's discussion homemade parts escutcheons bezels etc
"David, Check your inbox Mike"
Mar 11
David Dodgen replied to mike hadley's discussion homemade parts escutcheons bezels etc
"Does Anyone Know if reproductions are still available.  I am looking for escutcheons for my AW 23. David"
Mar 11
mike hadley replied to Thomas Lager's discussion Chrome paint?
"Brush on plating does work with excellent results but be careful, as the layer is only micrometers thick any surface marks will show, the part also has to be chemically clean and if it's made from any aluminium or zinc alloy it will present…"
Mar 2
mike hadley replied to Thomas Lager's discussion Phantom Deluxe dead oscillator & RF Amp
"here is a photo of the undersise of my Phantom in the rarly stages of restoration, the two modules that dave is referring to can be seenone mounted on the rear apron and the other nest to the center divider, these can be a swine to get out but they…"
Feb 26
mike hadley replied to Jay Forbes's discussion Philharmonic -- AC uA Meter
"I have tried both alignment with a wobbulator and the method posted by Norman both work. The meter needs to be dc as you are looking at the signal after the detectors and the signal here is dc, over here in the UK the nearest I could get to a 30ua…"
Jan 14
mike hadley replied to Joe Miller's discussion AW 15 Amp Problem
"Joe; Unfortunately all of the bathtubs are riveted in, as my aw15 was in such a mess when it came into my ownership I decided to restuff the bathtubs. They all have soldered on backs and they are all potted in tar, there are two caps that I didnt…"
Dec 22, 2023
mike hadley replied to Joe Miller's discussion AW 15 Amp Problem
"Hi Joe, The Bathtubs mounted on the rear wall backs are filters they consist of a choke and cap, the backs are soldered on, once removed the filter networkcan be seen The choke is on the right and the paper cap is on the left in the photo, be…"
Dec 21, 2023
mike hadley replied to Joe Miller's discussion AW 15 Amp Problem
"The earlier schematic that Joe was refering to was the result of not having the correct diagram for my aw15, https://ehscott.ning.com/forum/topics/allwave-fifteen-schematic I put it together from the Riders documentation and included a decent image…"
Dec 20, 2023
mike hadley replied to douglas wright's discussion Scott all wave 15
"Does your chassis have variable sensivity or is it switched, if so how many positions."
Dec 2, 2023
mike hadley replied to Kent King's discussion AW23 alignment issue
"As alex stated first thing is to check that the local oscillator is ok, a scope would be good but a frequency counter would be better as you only have a 20-30 Khz drift. once this is checked start looking at the IF, there could be a problem with one…"
Nov 27, 2023
mike hadley replied to Kent King's discussion AW23 alignment issue
"I take it you have checked the HT after the regulatotr tubes is stable and the 75k grid resistor is ok, I once had one drift high when warm, If the radio is ok on the other wave bands then it would suggest the oscillator circuit is ok, try swappping…"
Nov 26, 2023
mike hadley replied to mike hadley's discussion homemade parts escutcheons bezels etc
"Douglas, Check your inbox Mike"
Nov 25, 2023

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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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