EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

mike hadley
  • Hitchin
  • United Kingdom
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mike hadley's Discussions

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

Mcmurdo silver masterpiece v

Started this discussion. Last reply by mike hadley Aug 9, 2019. 4 Replies

Can anyone please help,I have recently managed to get my hands on a masterpiece v, but unfortunately someone in the past has removed the bass boost inductors from the output of the expander circuit,…Continue

Scott logo

Started this discussion. Last reply by Jon Ketron Aug 7, 2019. 3 Replies

Can anyone please help,I need a fairly good photo of the Scott logo from the rear of a speaker, the idea is to reproduce the artwork and make it available on this site,thanks in advance.MikeContinue

philharmionic bezel spring

Started this discussion. Last reply by Thomas Day Jan 12. 17 Replies

The dial bezel on my philly had tarnished to a dull brown, and the glass locking spring had rusted in position, this proved quite difficult to remove, after working at the old spring with a pick I…Continue

 

mike hadley's Page

Latest Activity

mike hadley replied to Kent King's discussion Unusual amp chassis
"Maybe the line up could be from right to left, power transformer, a pair of 5z3's, then a couple of chokes followed by three smoothing caps, then 6 x  6l6 tubes in push pull, finally a 6sn7 phase splitter, that would be good for a 100watts…"
yesterday
mike hadley replied to Steve Pierce's discussion Plug and Play FM tuner
"I use one of these, Bandwidth is excellent, a good companion for my Philharmonic, plus it uses the whole radio not just the phono input. Mike"
yesterday
mike hadley replied to Troy Taylor's discussion Low voltage in Philharmonic power supply
"Karl Look at the top of this page, Scott info and archive, see Philharmonic folder, lots of information there"
Jan 17
mike hadley replied to Troy Taylor's discussion Low voltage in Philharmonic power supply
"Troy, The 10H choke is in the supply to the 6L6 output tubes, the 30H choke runs the radio through the field coil, are your 6L6 tubes ok, have you checked the values of the biasing resistors for the tubes? check the audio output transformer for…"
Jan 17
Thomas Day replied to mike hadley's discussion philharmionic bezel spring
"Knowing your past experience with electro-forming, I would expect nothing less than perfection. Seriously, this looks like a very interesting way to make replacements for parts that are not available any longer. Hope it all turns out. Thom"
Jan 12
mike hadley replied to mike hadley's discussion philharmionic bezel spring
"Nice job Scott, Thanks for the update, it's worth noting that there are two different sizes of spring,  120 thou for the larger size and 92 thou for the smaller, I have made a mold, to see if I can electroform one, here are a couple of…"
Jan 12
Scott Seickel replied to mike hadley's discussion philharmionic bezel spring
"Mike, I got some 0.092" strings today.  I was able to find then in an online store that sold single stings.  Slightly smaller than the originals that I measured, but they still fit good.  I got both of my escutcheons that needed…"
Jan 11
Scott Dickson liked mike hadley's discussion philharmionic bezel spring
Jan 11
Scott Dickson replied to mike hadley's discussion philharmionic bezel spring
"Hi Mike, I'm Scott Dickson from Bakersfield, CA in the US.  Norman Braithwaite told me about you.  He said you might be looking into a reproduction bezel for the Philharmonic.  If you are, I would be interested in one.  I…"
Jan 11
mike hadley replied to Karl Sherwin's discussion Critique of Philharmonic performance
"Yes agreed Scott, killing the local oscillator is a must, as my philharmonic had been badly messed with, I was using a signal generator connect to the antenna input to try to get anything out of the radio, as it was so far out of adjustment it…"
Jan 7
mike hadley replied to Karl Sherwin's discussion Critique of Philharmonic performance
"From personal experience with my own Philharmonic, with the local oscillator tube in circuit and the set wired for agc alignment, there is so much gain around the I.F amp stage that if you are not careful you can get the whole if strip to start…"
Jan 7
mike hadley replied to mike hadley's discussion screw mount caps
"Thanks for the reply Dave, I have just finished a Stromberg Carlson 82 radio, the caps were so badly corroded I had to resort to this method once again, here is another few photo's of the caps, these are made upside down compared to the earlier…"
Jan 3
David C. Poland replied to mike hadley's discussion screw mount caps
"Mike - so cool, having reviewed your process again.  For a dual cap, ought to be able to use 2 screws, sized small enough to share the brass passageway, maybe with shrink wrap insulation for good measure and then potted as you suggest. Or…"
Jan 3
Scott Seickel replied to mike hadley's discussion philharmionic bezel spring
"The phosphor bronze strings are expensive.  I might have to buy a set and just pull out the size I need.  Looking at like $22 for a set, and I have 2 dials to do... It looks like 0.095" is a more common size to be included in a…"
Dec 26, 2020
mike hadley replied to mike hadley's discussion philharmionic bezel spring
"Scott, Thanks for measuring your glass retaining spring, luckily the difference between springs is quite obvious, looking at the measurement, I would go for a 90 thou one rather than a 95 because the smaller string would fit in the groove…"
Dec 26, 2020
Scott Seickel replied to mike hadley's discussion philharmionic bezel spring
"Mike, I don't think this is Scott's custom building.  I am sure that he just purchased these and they were not made in house. And yes, more than one size will fit, but it is obvious to me now that there were at least 2 different…"
Dec 26, 2020

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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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