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 Post subject: Really neat reproduction dogbone resistors!
PostPosted: Jun Thu 11, 2015 5:15 pm 
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http://www.ebay.com/itm/Dogbone-Resisto ... 43dd657861

I am sure this is very time consuming. The price seems quite reasonable considering the time and effort!

Image

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Jun Thu 11, 2015 5:20 pm 
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44 billion ohms?

That must have taken some effort.


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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Jun Thu 11, 2015 5:53 pm 
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I agree with Dave. That's very nice work at a very reasonable price considering how much time it must have taken to make those. :shock:

Bob

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Jun Thu 11, 2015 11:18 pm 
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Wow, I think that is great.


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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Jun Fri 12, 2015 2:11 pm 
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The seller is to be commended for doing an excellent job and proving a good product for a very reasonable price.
It might also be to his advantage to brush aside his bonehead bidder with the question, since he is expecting an engineering report.


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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Mon 09, 2019 2:31 am 
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Location: Laguna Niguel, CA
I have 1938 Richenbacher steel guitar amp I’m restoring and want to replace the way-out of spec resistors. Haven’t found a schematic but doing a direct replacement of each component with re-stuffed caps. Want to do the same with the resistors -I’ve attached a pic of the majority of the resistor circuit, The Orange bodies are no-brainers a 300K and a 35K, the Black a 50. But with the other 3 I’m not sure if I'm looking at red bodies or brown bodies. The color favors more of a maroon. So these could either be Brown Green Yellow -150K or Red Green Yellow -250K. the two that are tied together are from the 2 guitar inputs. Any thoughts? Also anyone know a source for reproductions?
Micajah


Attachments:
IMG_1256.jpg
IMG_1256.jpg [ 266.54 KiB | Viewed 755 times ]

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Mon 09, 2019 12:03 pm 
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Those 3 resistors look like 250K to me

There is a 100K laying against the 0.05 MFD cap

Then a 15K at the bottom of the image.

That is what i see. The orange dot on the lower one helps indicate the body color is brown.

If both body and dot were orange, then you would not see any dot at all.

-Steve

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Tue 10, 2019 12:58 am 
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Are the resistors way out of tolerance?

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Tue 10, 2019 3:02 am 
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Location: Laguna Niguel, CA
The Red Green Yellows (supposed to be (250K) measure from 297, 320, 314 and 391,
The Brown Black Yellows (100K) read 156K and 127K 0 though they still look orange to me, but Brown makes sense - with them being closer to 100K
The Brown Green Orange (15K) measures 22K
Micajah

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Tue 10, 2019 3:07 am 
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azenithnut wrote:
Those 3 resistors look like 250K to me

There is a 100K laying against the 0.05 MFD cap

Then a 15K at the bottom of the image.

That is what i see. The orange dot on the lower one helps indicate the body color is brown.

If both body and dot were orange, then you would not see any dot at all.

-Steve

So the Black Green Brown in the far upper right would be 50 ohms?

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Tue 10, 2019 3:08 am 
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azenithnut wrote:
Those 3 resistors look like 250K to me

There is a 100K laying against the 0.05 MFD cap

Then a 15K at the bottom of the image.

That is what i see. The orange dot on the lower one helps indicate the body color is brown.

If both body and dot were orange, then you would not see any dot at all.

-Steve

Steve Olson - a member here makes his own:

https://www.youtube.com/watch?v=0ddMuSt_aR4&t=78s

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Tue 10, 2019 11:43 am 
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micajah wrote:
So the Black Green Brown in the far upper right would be 50 ohms?


Oh I missed that one... which is very odd. I've not seen a resistor start with black.
What does it measure?

I wonder if it got mis marked and is supposed to be 500 ohm?

-Steve

P.S. If you could obtain hollow tubing with those ribs of the right diameter, slide modern resistors inside then wrap leads onto them it would simulate the originals.

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Mon 16, 2019 3:29 pm 
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Location: Laguna Niguel, CA
Steve - you inspired me - so I made my own repros - the Black Green Brown after closer inspection - and brighter light ended up to be Violet Green Brown - 750 ohms. So here's the before and after. Also going to put a note into the amp for any future restorers that the caps have all been re-stuffed and that the resistors are all modern equivalents and the date of the restoration.


Attachments:
IMG_1256.jpg
IMG_1256.jpg [ 266.54 KiB | Viewed 402 times ]
IMG_1287.jpg
IMG_1287.jpg [ 292.27 KiB | Viewed 402 times ]

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Mon 16, 2019 3:44 pm 
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Wow, really good job. Your reds are really good, but the new resistors oranges look like brown on my monitor. Is the resistor laying across the .05 cap supposed to be yellow-black-orange (40K)? Looks like yellow-black brown. Maybe it just the camera ? .
EDIT: Reread the postings and see you have measured the original closer to 100K, so the body colors you have are correct. Wait, I need to reread and think this thru ??
Yeah, your markings are better than the faded originals. :D

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 Post subject: Re: Really neat reproduction dogbone resistors!
PostPosted: Sep Mon 16, 2019 4:41 pm 
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Location: Dayton Ohio
Now those are impressive! :D

Great work! Yes, I can believe the purple faded so dark it looked black. Good save!

I assume you used hot melt glue in the caps? For a more natural look you could use the glue up to within a 1/4 inch of the end, then cap them off with natural (yellow) beeswax. I get blocks of the stuff at Hobby Lobby. as seen here.

https://www.hobbylobby.com/Crafts-Hobbi ... ck/p/24978

-Steve


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cd-cub-end.jpg
cd-cub-end.jpg [ 111.85 KiB | Viewed 392 times ]

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