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 Post subject: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 4:10 am 
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Joined: Sep Mon 24, 2012 10:14 pm
Posts: 1013
Location: Topeka KS
The transformer on my Zenith 8-S-451 was bad. One of our members (Thanks John) pointed me in the direction of a transformer that will work much better than the original by adding windings for a better rectifier tube. How would you document these changes? A note stuck under the chassis and marking the socket with the correct tube? A marked up schematic in an envelope taped inside the cabinet?
Thanks


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 1:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7846
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Unless the radio is historically significant there's not much point. However, if it's something that you are concerned about, an envelope with the service work printed on a sheet of paper and placed inside it will be more than sufficient. What are the odds that many of our radios will survive our estate long enough to be worked on again? Pretty slim ....


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 1:37 pm 
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Joined: Jun Wed 08, 2011 2:33 am
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Location: Ohio 45177
I might put a little sticker on the front of the chassis that says recapped on so and so. Or write it inside the chassis with a sharpie.

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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 6:40 pm 
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With amount of fun(hair pulling) some of the radios discussed here generate, I won't make any notations. I'm not going to deprive the next generation of the experience.

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Tom


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 9:40 pm 
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Joined: Sep Tue 15, 2015 1:16 am
Posts: 537
Location: 18424 PA
"I replaced the 0.02uf condensors with .022uf capacitors" "See posting.php?mode=reply&f=1&t=123456*#$%6* for more info"


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 08, 2019 11:00 pm 
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Joined: Sep Thu 14, 2006 3:27 pm
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Location: Carmel, Indiana
Usually I figure I'll just let the future generations figure out my changes and repairs BUT one time I did leave a note in one of my 1920s superhets stating that I had replaced all of the type 22 tubes with type 32 tubes and each of their sockets had a voltage dropping resistor so that when you set the voltage on the receiver's volt meter to the recommended 3 volts, all of the 32 tubes will actually be receiving 2 volts across their filaments. I replaced these tubes because 32 tubes are more plentiful, cheaper, and have a higher gain then the recommended 22 tubes.

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Michael Feldt
www.indianaradios.com


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Tue 09, 2019 2:25 am 
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Joined: Mar Wed 16, 2011 10:44 pm
Posts: 944
Location: Peekskill, NY
Every set I work on has a working copy schematic. I mark any changes on that in pencil,
so when I'm done the schematic is a complete and accurate description of the set. I keep
that document in a folder for each set, with any manuals or alignment information.

All working diagrams, such as as schematics of the set as found, and pictorials that I
draw to document what the lead dressing is to start with, go in there also. Mechanical
drawings for parts I needed to make, etc.


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Tue 09, 2019 2:29 am 
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Joined: Aug Mon 08, 2011 4:19 am
Posts: 404
Location: Indianapolis, Indiana, USA
I include a schematic with the radio and notes with day, month and year of work done. If I did a lot of work on an important radio, I include documents in a folder. Other radios get an envelope with schematic, Riders or Sams and notes of what I did.

Joe Filipczak


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Sat 13, 2019 5:34 am 
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Joined: Dec Sat 24, 2011 9:17 pm
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Location: Vancouver Island, Canada
My changes are all good so who needs to know what they were? 8)

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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Sat 13, 2019 6:04 am 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 11420
Location: Powell River BC Canada
Any old radio that really has had a life through WW2 is likely to
have different power, output, IF transformers and chokes and is spotted
immediately at a glance. Any other majors, like tuning capacitors
would have made it a frankenradio not likely to work.

Dynamic speakers could be swapped too.

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de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Sat 13, 2019 1:09 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7846
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
radiotechnician wrote:
Any old radio that really has had a life through WW2 is likely to
have different power, output, IF transformers and chokes and is spotted
immediately at a glance. Any other majors, like tuning capacitors
would have made it a frankenradio not likely to work.

Dynamic speakers could be swapped too.


I won't say that this is unlikely, seeing as you are in a completely different area (environment etc), but this is the polar opposite of my experience. I don't recall seeing more than a couple of replaced "major" components in radios that I have seen come thru' here (many hundreds). I would say that my experience is that 99.9% of the sets I have seen were unmolested other than having had tubes replaced.


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Sat 13, 2019 10:19 pm 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 11420
Location: Powell River BC Canada
John Bartley wrote:
radiotechnician wrote:
Any old radio that really has had a life through WW2 is likely to
have different power, output, IF transformers and chokes and is spotted
immediately at a glance. Any other majors, like tuning capacitors
would have made it a frankenradio not likely to work.

Dynamic speakers could be swapped too.


I won't say that this is unlikely, seeing as you are in a completely different area (environment etc), but this is the polar opposite of my experience. I don't recall seeing more than a couple of replaced "major" components in radios that I have seen come thru' here (many hundreds). I would say that my experience is that 99.9% of the sets I have seen were unmolested other than having had tubes replaced.


I cant really call myself a restorer of radios. I started repairing radios in the 50s. As such radios, and TV sets were my sole way of earning a living. The range of radios is different than would be out
there today. Exact power transformers were not available for pre-war radios, but companies like
Hammond furnished suitable replacements, (and still do).

Small radios lasted well into the late 60s, and often were found with different output transformers, volume
controls, speakers and multi section capacitors.

A radio upstairs comes to mid, here. Philco 20,retro transformer,
modified to use an 82 rectifier.

As to the Philco 20 series, I repaired a few in the 50s, even saw the odd few
in Vancouver in the early 60s.

71-A tubes were cheap. And rest assured I tacked in capacitors to stop the hum.
The thought of digging out the potting never occurred. There was only a few dollars
for labor for such an old radio. And every dollar counted then.

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de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Sun 14, 2019 1:43 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8828
Location: Beaver Falls, PA. USA
From 50+ years of working on old radios, TV sets, and amplifiers, here are the most commonly replaced parts that I have found:

1. The volume control, especially if it has the on-off switch attached.

2. Filter capacitors, especially the wet types, or those in cardboard containers.

3. Audio driver transformers, especially in sets using them to drive push-pull outputs.

4. Bypass and coupling capacitors, although technicians in the old days generally replaced only the ones causing trouble. Customers would never have paid for the complete recapping jobs that we do today, and it really wasn't necessary when the equipment was relatively new.

5. Much less commonly: filter chokes, IF and power transformers, and similar parts.

Only rarely have I found any notes on the chassis to indicate the work done.

The Stewart-Warner 1361 in my collection had the power transformer and electrolytic capacitors replaced, and a line fuse was added. My suspicion is that the early "birdcage" 5Z4 shorted out, and took out the other parts in a cloud of smoke! No wonder that the long-ago repairman added the fuse; he did use an original S-W replacement transformer.

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Tim KA3JRT


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 15, 2019 9:50 pm 
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Joined: Nov Fri 10, 2006 12:24 am
Posts: 2312
Location: Thornhill, Ontario, Canada
I may have said this elsewhere... anyway, I write it up on paper, date it. fold it and put it under the chassis.
For my own stuff I open a paper file folder.
Cheers,
Roger

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Roger Jones,
Thornhill, Ontario
Ontario Vintage Radio Assoc. http://www.ovra.ca


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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Mon 15, 2019 9:51 pm 
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Joined: Nov Fri 10, 2006 12:24 am
Posts: 2312
Location: Thornhill, Ontario, Canada
duplicate... sorry.
Cheers,
Roger

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Roger Jones,
Thornhill, Ontario
Ontario Vintage Radio Assoc. http://www.ovra.ca


Last edited by engineer on Apr Tue 16, 2019 4:04 pm, edited 1 time in total.

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 Post subject: Re: How (or do) you document changes?
PostPosted: Apr Tue 16, 2019 12:54 am 
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Joined: Dec Sat 24, 2011 9:17 pm
Posts: 4243
Location: Vancouver Island, Canada
I have paper files for my earlier radios, schematics and notes, all buried.
Some radios will have a note "Recapped-no LO, Bad switch, No AM, needs a socket replaced", etc.
Notes are tucked in the back with a bit showing so they will be pulled out and read.

Nowadays I save pics, before, after, chassis shots, all in picture folders, each radio has a folder. Alphabetical order.
So if selling one, can put the info together.
Paper schematics are in a file folder, no particular order. It's a hobby, and I did home office most of my working life, so organizing that stuff is low on my list.

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Watch the doughnut, not the hole.
Burl Ives, RIP, oldtimer.
[:l>)


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