[Milsurplus] [ARC5] TCS RF ammeter or thermocouple replacement

[Henry Frederick "Meils" Meiseles]

Yes, I was looking for the FS rating before and just discovered this:  "ØFS" 
where Ø represents one of the
meter-scale mounting-holes and screw, but finding the FS value is easy 
enough.
The Meter is a "SANGAMO WESTON MODEL 507.


----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Henry Frederick "Meils" Meiseles" <meils at get2net.dk>
Cc: <milsurplus at mailman.qth.net>; <arc5 at mailman.qth.net>; "mac" 
<w7qho at aol.com>; <tcs_radios at yahoogroups.com>
Sent: Wednesday, May 25, 2011 8:57 PM
Subject: Re: [ARC5] [Milsurplus] TCS RF ammeter or thermocouple replacement


> If it's been worked on, check the wiring and connections. The meter dial
> usually says something like 1 mV FS, and that info can be used to test it.
>
> -John
>
> ==============
>
>
>
>> Yes, I've used TCS  for years by just loading via the plate current but I
>> would like
>> to get the RF Ammeter going again instead of it just staring at me, one
>> eyed,
>> begging me to do something! Just dismounted it, judging from burred slots
>> on
>> the tiny emplacement
>> screws, this meter's been worked on before. The terminal bolt nuts, flush
>> against the bakelite/presumanbly
>> thermocouple base/are VERY firmly tightened. I've repaired several meter
>> movements
>> before, but have never "resurrected" a thermocouple.
>>
>> Had and still have another burnt our RF Ammeter but I didn't see how I 
>> was
>> going to get at the thermocouple
>> bulb without shattering the glass  -- maybe they can function w/o being 
>> in
>> a
>> vacuum - that is if
>> the thermcouple can be repaired as someone else one list says they can..
>>
>>
>>
>>
>> JFOR -- my thought, too that since it shows some reading, it's
>> not totally hopless -- I could also just multiply the readings by about
>> four!.
>>
>>
>> Well what do you know , TCS_Radios at yahoogroups.com ! Thanks for that!
>>
>>
>> Henry, Cph.
>>
>> ----- Original Message -----
>> From: "mac" <w7qho at aol.com>
>> To: "Henry Frederick Meils Meiseles" <meils at get2net.dk>;
>> <TCS_Radios at yahoogroups.com>
>> Cc: <arc5 at mailman.qth.net>; <milsurplus at mailman.qth.net>
>> Sent: Wednesday, May 25, 2011 7:02 PM
>> Subject: Re: [Milsurplus] TCS RF ammeter or thermocouple replacement
>>
>>
>>> Don't let a bad RF ammeter keep you from using the radio, though.   Just
>>> tune and load it up using the PA plate current meter like you  would
>>> with
>>> a Viking 2  or any of the many other ham HF rigs that never  included RF
>>> ammeters.
>>>
>>> Dennis D.  W7QHO
>>> Glendale, CA
>>>
>>> *****************
>>> On May 25, 2011, at 8:54 AM, Henry Frederick Meils Meiseles wrote:
>>>
>>>> I need a repalacement for my TCS RF ammeter -- or perhaps just the
>>>> thermocouple, if that is replacable.
>>>> Of course I could always make a makeshift RF output readout using a
>>>> diode (WS-19 style) and self- calibrate a panel meter (putting in a
>>>> new
>>>> face on the original or an other meter)  but prefer to keep the
>>>> original
>>>> meter.
>>>>
>>>> I haven't opened the meter yet to take a closer look at the how the
>>>> thermocouple is mounted -
>>>> I assume that once a thermocouple is overloaded, it's not reparable.  I
>>>> do have other thermocouples
>>>> of another type, which I could use and calibrate a new dial face --
>>>> again losing
>>>> the original installation.
>>>>
>>>> My TCS-12 RF Ammeter hardly budges, even under heavy RF currents.  The
>>>> problem  appeared many years ago, probably, if I remember  correctly, a
>>>> result of drawing too much current while matching an  antenna using an
>>>> external variable capacitor across the RF output. I  haven't used the
>>>> rig
>>>> in many years but now wish to reactivate it --  also remember that the
>>>> RF
>>>> Ammeter on my GF-11 had to be treated with  caution.
>>>>
>>>> If anyone has an extra TCS RF ammeter/thermocouple unit, please let  me
>>>> know.
>>>>
>>>> Thanks in advance,
>>>> Henry oz3o, n2nr
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>>
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