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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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19th Oct 2020, 8:56 am | #21 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,902
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Re: F. Stephen Masek's HMV468 restoration
Threads merged.
Good detective work. That wiring error removed all negative bias from the PX4 so the poor thing would have been locked into carrying maximum current, and that explains the low audio output. I'm glad it seems to have survived and lives to play another day. This is the best possible outcome! David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
19th Oct 2020, 3:34 pm | #22 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: Success with an HMV468
I have it set at 250 volts, and am using my 120 to 240 transformer. Of course, the clock will not keep time in the USA. I will almost surely take the radio back to Europe. We have a second home in Vilnius, Lithuania.
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21st Oct 2020, 9:23 am | #23 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,766
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Re: F. Stephen Masek's HMV468 restoration
Very nice restoration job ,love the finish on the cabinet , these sets are not for the faint hearted , well done. Mick.
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24th Oct 2020, 3:37 am | #24 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: F. Stephen Masek's HMV468 restoration
Thank you! Indeed, this is not one for a beginner. It has been interesting learning that the same chassis was used in quite a few different models. The fuse in the center tap of B+ has probably helped prevent many of them from being scrapped due to power transformers destroyed by bad capacitors. Do any of you have another radio with this chassis? Pictures?
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24th Oct 2020, 10:15 am | #25 |
Dekatron
Join Date: Oct 2003
Location: Southport Lancashire, UK.
Posts: 3,236
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Re: F. Stephen Masek's HMV468 restoration
Very nice restoration. It is threads like this which provide a reference and hints for those tackling repairs on similar sets.
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Paul |
21st Nov 2020, 11:44 pm | #26 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: F. Stephen Masek's HMV468 restoration
I aligned it today. It sounds great playing the Mandarin music station, AM690, when I took this photo.
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23rd Nov 2020, 2:41 am | #27 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: F. Stephen Masek's HMV468 restoration
I tried my hand at some blacksmith work today to make a new chassis bottom brace. I had one of the originals. I got a piece of steel, but was wondering how to bend it, as I do not have a vice. I do have some large hammers and a MAPP torch, so laid the strap on one hammer, heated the steel red hot, then used the other hammer to pound it over, then quenched it in the birdbath. I then drilled and tapped the strap.
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28th Nov 2020, 4:44 am | #28 |
Pentode
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 144
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Re: F. Stephen Masek's HMV468 restoration
It is finished, looking good and playing nicely! The plastic trim (thankfully not Tenite!) is retained by wood pieces attached to the front with tiny screws. The clock board attaches to the cabinet front with five screws, then small wood pieces are attached to it and to the cabinet top an sides with another 20 wood screws. The diamonds on the clock face are attached to the parallel rails with tiny screws. I still need to make a back. The power to our house was running high today, as I measured 250 volts going into the radio from my 120 - 240 transformer.
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