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 Post subject: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 5:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7119
Location: Portland Oregon
What possible reason would there be for a 1924 five tube Halowat set to have that number of dials. I have heard of tube inflation but I wasn't aware of a competition for the highest number of knobs and switches.
Ed


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 Post subject: Re: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 5:34 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11794
Location: S. Dartmouth MA 02748-1225 USA
Early production vacuum tubes were not alike enough to operate the filaments from just a single rheostat. Especially tubes from small companies.

A filament rheostat for each of the five tubes, two tuning condensers and each tuning circuit with a tap switch or variometer.

There is a stage jack for the detector, 1st af and an output. An all purpose receiver :D

Federal 61 is another radio for an operating engineer.


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 Post subject: Re: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 12:50 pm 
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Joined: Sep Thu 14, 2006 3:27 pm
Posts: 10317
Location: Carmel, Indiana
If you look closely, 3 dials have scales that go 180 degrees. Those would be the tuning and RF control dials. All of the other dials have scales that go 270 degrees. Those would be the rheostate dials. The manufacturer simply chose all of the dials and knobs to be of the style and size, that's all. Just part of the overall styling of that particular model. Halowat wasn't the only radio manufacturer to have gone with that style.

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 Post subject: Re: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 4:07 pm 
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Joined: Dec Thu 31, 2009 4:28 pm
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Location: Medford OR
Ed, I wonder if they ever built one of those?

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 Post subject: Re: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 5:23 pm 
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Joined: Jan Mon 30, 2012 2:03 am
Posts: 325
Location: Port Orchard, Wa
Before TRF and Neutrodyne sets became the norm, most radios were one tube regenerative radios. Most were used with headphones
and had a soft detector like the 00 tube. these radios operated at 22.5 volts, or less on the plate. If you had a one or 2 stage amplifier,
it usually operated at 45 volts on the plates. Once radio became popular, the 4 or 5 tube Trf and Neutrodyne sets became the norm and
to get the power for room filling volume, plate voltage was increased to 67.5 or 90 volts or more. At 90 volts, the 01a operates at the
upper end of its characteristic curve, and strong input signals to the grid now create distortion. There are 3 ways to prevent distortion:
(1) Reduce plate voltage-which defeats the purpose of raising plate voltage in the first place.
(2) Introduce C bias which required another battery and more hookups, or...
(3) Reduce filament voltage. Less voltage, less emission and no distortion, but this requires a separate filament reostat for each tube since
The early tubes were sketchy as Chas pointed out.
That is why this Halowat used 5 reostats-which was not that uncommon for early TRFs. Most looked more like this Howard
https://www.radiomuseum.org/r/howard_ho ... odyne.html. The Howard model A has no connections for a C Battery.


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 Post subject: Re: Halowat of Portland with a record number of dials
PostPosted: Feb Wed 07, 2018 6:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7119
Location: Portland Oregon
Hi phlogiston, that is the first and only mention of that particular set that I have ever seen which may mean that it was just a passing thought. like you suggest. I would sure love to find one though.
Ed


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