[ARC5] ARC-2 Information

[Tom Lee]

I can attest to that! Having worked for several years in a TV/radio 
service shop in the early 1970s, I can verify that AA5s of that era 
always had the chassis hardwired to one side of the AC line. The nominal 
filament voltages added up to 121V for a reason. Classic problem was 
replacement of a frayed cord or bad plug by the consumer, who had a 
50-50 chance of tying the chassis to the hot side of the line. Murphy 
guaranteed that I would only see that 50%.

The Progressive/Regressive Edukits not only did the same thing, but with 
resistance wire to drop much of the line voltage to drive the filaments. 
My next door neighbor replaced the cord with a regular piece of zip 
cord. The result was much unhappiness.

-- Tom

-- 
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 9/6/2020 18:38, Scott Robinson wrote:
> Actually, quite a  few AC-DC radios DID have their chassis wired to 
> one side of the line Some mid-30s examples are a horror--easily 
> touched live parts. Late _mid-fifties and on (Zenith, in particular), 
> did a very good job isolating the chassis in their AM-FM table radios.
>
> Since most small TVs had metal cases, I bet they are isolated.
>
> Scott Robinson
>
> PS-I hate AC-DC radios.
>
> On 9/6/20 6:08 PM, Hubert Miller wrote:
>> Except: Scott, the machines with one side of the AC line connected 
>> directly to chassis were bottom end, such as the
>> buzzbox welders advertised in magazines and kit radios for young 
>> people. ( "Regressive Edu-Kit" was one )
>> TVs and radios did not have the chassis connected DIRECTLY to AC line.
>> ONE ham rig did, I think SBE-13. I have one somewhere. Had a safety 
>> indicator lamp on front panel.
>> -Hue Miller
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