[MRCA] ATC ART-13

[B. Smith]

While  initial testing of the set and planning your HV supply  - - lower 
voltages can be used, I reserve a "low power" supply for this purpose on 
the bench.
Z


On 5/17/2023 1:44 PM, Christopher Bowne wrote:
> Jeep, when you apply the 400V prior to the high voltage, what are you 
> doing with respect to the 813 screen voltage.  I’ve always been of the 
> understanding that applying drive and screen voltage to a screen grid 
> power tube without plate voltage applied should never be done because 
> it would cause the screen to draw heavy current and quickly destroy 
> it.  Typically the screen voltage would be obtained by a voltage 
> divider from the plate HV circuit to avoid the possibility of leaving 
> the screen at potential without plate voltage present.
>
> Chris B. AJ1G Stonington CT
>
> Sent from my iPhone
>
>> On May 17, 2023, at 10:52, Jeep Platt <jeepcomms at outlook.com> wrote:
>>
>> 
>> I just sold an on the air ART-13 and ARR-15 receivers for $1k. The 
>> ART-13 was complete and virtually new condition.  The ATC (Navy 
>> designation) and the ART-13, both T-47s, are virtually the same. I 
>> would shoot for the easiest one to get on the air.  I might also 
>> recommend an a.c. power supply, to begin with. That will allow 
>> sequential application of voltages; filaments first, the 400v, then 
>> the 1100v HV.
>> Things to sequentially check:
>> All tubes light up.
>> Autotune works and properly "homes". ( no home, no TX key).
>> Apply 400v and check grid drive.
>> Finally, apply HV and check for power out.
>> If you need initial dial settings for test on 75 meters (can provide).
>> You will need between 700 and 1100pf of loading to tune 75 meters at 
>> 50 ohms.
>> Been there, done that, at least 8 times....  It can be done.
>> Jeep K3HVG
>>
>> Sent from my Verizon, Samsung Galaxy smartphone
>> Get Outlook for Android <https://aka.ms/AAb9ysg>
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