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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Mon 05, 2019 3:25 am 
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Location: Dos Rios, CA. region
All looks showroom floor worthy, Steve, very nice!! :) I may have an all octal mixer amp to spare for next summer's project :?: if interested, though it wouldn't be a Bell from Columbus...I've only come across their Hi-Fi before
-Kent


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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Mon 05, 2019 3:39 am 
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Location: Central PA 16801
hi kent,

thanks

send me some pics sometime of the mixer amp.

do you still have my email address ?

steve

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Mon 05, 2019 4:19 am 
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Yes, I retrieved the address from old PM's so have it handy....
What I can think of off the top of my head that's all octal, art deco style and nice are:

1956 RCA MI-13299-A Deluxe Amplifier (50 watts 807's, 4 channels w/ mic input transformer capability and 6SF5's for pre's, already rebuilt by a friend over ten years ago, probably needs a rehabbing...I restored the cab over the years and still have photos of it's horrendous condition when I received it from southern Indiana ...
Operadio 1A140 (6V6G p/p) Nice, untouched except for tube testing and wrangling
Rauland 1916 "Green Gem" as above,...


There may be more... (I'll have to look around)

Also have many nice octal preamplifier mixers for recording (more than I can possibly ever use :cry: )
A "Newcomb KX-6A" for example..
If possibly interested in those, too, I can send photos to your email as well...

All this year I've been attempting to build a pair of compressor/expanders for remastering my original recordings
from old octal circuits from mid thirties through the 50's....right now my plan is building a circuit with 1612's in P/P from QST, 1945.,
I referenced from the RCA Radiotron Designer's handbook 4th Ed, 1952., into the metal cases of a pair of Altec 352A parts unit's...


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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Mon 05, 2019 9:15 pm 
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Location: Central PA 16801
thanks,

steve

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Wed 07, 2019 2:47 am 
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just when I thought i had the shop all cleared out and began packing things up this weekend...

look what found me, honestly...

a 1943ish Thordarson Amp.

steve


Attachments:
SAM_5506.JPG
SAM_5506.JPG [ 139.26 KiB | Viewed 305 times ]

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Wed 07, 2019 3:03 am 
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There you go! I have the same model I believe unrestored electrically a 31w25. (EDIT: Or the larger 31W50?)
These are very nice amplifiers with excellent iron, I have lots of info on them, will scan and send soon to your email
All octal!! 8)
Now I guess I can tell you I may build a all Sylvania Loktal :!: tube compressor at some point in the future from same era circuit as these Thordarson models
as well as a Thordarson 31K11? similar circuit compressor from same line as these amplifiers (1940 to 1948?)


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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Aug Wed 07, 2019 3:14 am 
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Location: Central PA 16801
excellent. yes, all OCTAL.

:lol: keep the locktal stuff away from me :evil: .

tom bavis is probably finding me a scan of the sams, but i will gladly ALSO :) accept whatever you have on this amp.

you can email it or mail me a CD, whatever you want to do. i will PM you my email address.

between you and Tom, i hope to have more than i need for September 8) .

thordarson amp restoration thread seen here with more pics:

viewtopic.php?f=13&t=363006

steve

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Nov Sun 10, 2019 11:44 pm 
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Location: Mikwaukee, WI 53207
Fantastic work !!
Congratulations

I just saw one of these amps at an estate sale. I passed it up but after seeing your project, I’m going to see if it’s still available.

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Nov Mon 11, 2019 12:36 am 
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Joined: Jan Mon 18, 2010 2:13 am
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Location: Dayton Ohio
I too have one of those Thordarson amplifiers!

Someone stenciled in "Modulator" on the front of it, so I supposed it was used to Amplitude Modulate a transmitter.

-Steve

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Nov Mon 11, 2019 2:29 am 
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Location: Dos Rios, CA. region
Post some photos if you can soon of your "modulator" version? Wonder if there were any other modifications to the circuit inside. (probably not needed)
I still have not gotten around to rebuilding my 31w25A....one of these days there will be a post...
I'm using some of the cross referenced parts from Dutch Rabbit's abandoned (bad power transformer) 31w25 amp posted here to build a similar era (1947?) Thordarson circuit 10 watt Compressor Expander Phono recording amplifier using 6B4's in P/P on a Scott Labs 800B speckled chrome chassis base...This circuit is similar to the "expander only" 31w11K found in Rider's, which saw limited production I believe at the time, or perhaps was offered in a kit?
-Kent


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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Nov Mon 11, 2019 2:44 am 
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Location: Central PA 16801
Kasanay wrote:
Fantastic work !!
Congratulations

I just saw one of these amps at an estate sale. I passed it up but after seeing your project, I’m going to see if it’s still available.


thanks,

go and get it !

steve

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 Post subject: Re: Bell Amplifier Restoration Finished
PostPosted: Nov Mon 11, 2019 1:04 pm 
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Joined: Jan Mon 18, 2010 2:13 am
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Location: Dayton Ohio
Here is a photo of mine. Its not as nice of condition as I remembered it. A pot is missing as are two knobs. Also a switch was added.

I originally had the idea of using it as a modulator for an AM transmitter, which I never got around to.

So much to do, so little time and energy. Lessee, work consumes 11 hours a day, Sleep 8. Add needing to eat, shower, and other daily tasks, it doesn't leave much :cry:

-Steve


Attachments:
thordarson-amp.jpg
thordarson-amp.jpg [ 587.22 KiB | Viewed 114 times ]

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-Pre-War FM
Consoles and floor models, the bigger, the better!
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