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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 04, 2013 3:24 am 
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Steve does nice work; his restored Zenith 37A took first place in the contest at the Tri-State Radio Fest.

viewtopic.php?f=1&t=192452

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 04, 2013 6:42 pm 
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Thanks for posting the flyer, Ken! And thank you for your comment, Tim.

I had read about the display at the 1939 Worlds Fair several years ago and saw a video of the demonstration on Youtube.
It is fascinating what was at that Worlds Fair.

http://www.youtube.com/watch?v=2puK4Z967kU

I promise, it won't be painted white. :lol:

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 05, 2013 1:08 am 
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Wow, this is really a challenge to restore. What tubes were used in the generators?


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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 05, 2013 1:39 am 
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The majority of tubes in the Generator unit are 6C8G Oscillators and 6W7G Control and Divider tubes.

It will be a challenge. I plan to setup a 4 X 8 foot bench dedicated to the restoration of this beast.. I have no intention of loosing my normal repair bench for the length of time it will require to restore.
It is a good thing that I have been clearing room in the garage. There will be some consoles up for sale in the classifieds soon. maybe bring them to Kutztown. :wink:

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 11:40 am 
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Hi Steve,

Just curious if you have picked up the Novachord yet. If so, how does it look? Post a few pics!

- George

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 11:54 am 
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George, I was just about to do so! :D

I just got the Novachord home yesterday. I was planning on posting pics, but I was overtaken by an ocular migraine which affected my vision enough to stop me. :(
First off, I can understand why there aren't many of these around, and why they aren't very popular. These things are heavy! and I mean, HEAVY!

Anyhow, here are some pictures. You can see all those tubes in the generator! :D

The one thing which concerns me is the power supply. Someone did much modification, and I need to sort out what is going on. You can see one of the transformers is hanging off the edge of the chassis. It must have been replaced at some point. The confusing thing is all the transformers have the AO-xxxx part numbers on them. One of the chokes is not connected at all.

Much work ahead!

Thank you very much, Ken! It was great doing business with you as well as meeting you and seeing your collection! Also, your cat Spike! :D

-Steve


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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 2:41 pm 
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All I can say is "I can't wait to follow this restoration". I am not a musician but would love to have gotten one to restore.

(Glutton for punishment; champagne taste and beer money :lol: ).

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 2:46 pm 
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Hi Steve,

Glad you and it got there safely but my back is starting to ache again just looking at the photos!
Seriously, it looks happier in Ohio already.

ken


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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 3:30 pm 
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Good luck with this project; you've certainly chosen a daunting one. It'll be a matter of many months--maybe several years--and it'll be a royal PITA simply to retube that beast.

I'm no stranger to formidable projects, but I wouldn't have dreamed of tackling this one even in my best days. I'll stick with my DX7's :wink: .

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 4:07 pm 
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I do admit I am questioning my sanity and will question it more as I go along. I'm sure many of you think I'm complete nuts! ...and your probably correct! :wink:

According to this webpage http://www.dairiki.org/HammondWiki/HammondNovachord #1851 is a late production model. If this info is accurate, I'm guesstimating that it was manufactured around the first of April 1942.

I have started testing the tubes. Sadly, the very first one I tested (6C8G) has one section with an open heater. I'm at #25 as I type this, and its the only bad one so far. Keeping fingers crossed! :o

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 4:20 pm 
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Keeping fingers crossed for you too!


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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Sun 18, 2013 4:29 pm 
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Glad that you are getting going on the project. One tube bad so far isn't a bad thing. Are you going to put the tubes back into their sockets? If you do, you won't have to worry about where to store them. You can remove them when you start on the chassis restoration.

I can see that Mouser will be getting a HUGE capacitor order...

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 12:46 am 
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Is that a Wurlitzer 4500 back there?

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 1:36 am 
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Delcoman wrote:
Is that a Wurlitzer 4500 back there?


It is a Conn 634 Serenade from the 1970s. I'll gladly sell it to help pay for parts for my Novachord. :D

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 2:31 am 
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What did that bloody thing cost back then? And then convert to 2013 dollars? I can't imagine with all that is inside of it. Quite a piece of equipment.

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 2:39 am 
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Don the best I can determine it was $1900 back in 1939. Roughly $31,200 today. :shock:
Probably could buy a house for that back then?

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 4:17 am 
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Hi Steve,

Great pics! Thanks for sharing. Man that is a beast. You might have to add a dedicated AC circuit just to run it! That has to draw some amps. Make sure you have a heavy duty variac on hand when your ready to start testing it! :D

- George

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 3:32 pm 
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The ID plate states 440 watts. or 611 Watts with an additional amplifier. I'm not sure what they mean by that as there is only room for ONE amplifier.

I do have a BIG 21 amp Variac which will handle about anything that will plug into a standard AC outlet! :lol:

-Steve

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Mon 19, 2013 3:33 pm 
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azenithnut wrote:
Don the best I can determine it was $1900 back in 1939. Roughly $31,200 today. :shock:
Probably could buy a house for that back then?

-Steve


Thanks Steve. And yes, you could buy quite a nice house with that amount of money. Mom and Dads 1st home was a row house (now cleverly called "Town House") in Catonsville, MD. It cost ~$8,500 new in 1951. So, that $31,200 was a lot of shekels...

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 Post subject: Re: 1939 Hammond Novachord - Unrestored
PostPosted: Aug Tue 20, 2013 2:19 am 
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Well, after giving my Jackson 648-1T a good workout, the tubes are all tested.

6C8G 1 of 12 has a bad section. Heater does not light up on one triode.
6W7G 1 of 132 (Yes, 132!) is slightly weak, but probably will work just fine.
6J7G 1 of 3 has a Heater-Cathode short (one of the three is actually a 1620)
6J5 all 3 good, two are metal
6K6 2 good, one has broken key
5Y3 2 of 3 missing
5V4G missing

56 2 good
2A3 4 good
5Z3 good

All of the tubes have grease pencil markings of being tested previously. From the markings, it looks to me that they were tested on a TV-7
I could have retested them on my own TV-7, but I feel the Jackson with its Gas/Grid Leakage test did just fine. Plus it has a sensitive short test.

I'm glad to get that task out of the way. Though, that was the easy part! :wink:

I believe I will tackle the power supply first to see what the deal is with the missing rectifiers and wires coming out of the tube sockets.
Oddly enough, all iron have the correct part numbers printed on them, even though the first power transformer hangs over the edge of the chassis.
I find it hard to believe Hammond manufactured it that way? :o

Now, get a load of the power supply schematic. There are NO large filter capacitors. It looks as if it uses active filtering? I've never seen anything like this before.

-Steve


Attachments:
powersupplys.png
powersupplys.png [ 112.01 KiB | Viewed 3775 times ]

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