[TenTec] TT 238C will not tune

[denton sprague]

won't tune dummy load…will slightly mistune same…
am also using 238A for reference that tunes my antenna system good. 
Running an 80 meter horizontal loop with 450 ohm feeders and 4 to 1 balun in shack…also comparing to the TT tuners internal balun.
all 4 ant positions check good…sees flat into dummy load w/o balun strap.
front knobs turn roller inductor and variable cap as should be.
It acts almost as if the roller inductor is not hooked up correctly. Cold solder joint? 
Stan(I think) told me that another ham had traded the 238C and a amp in for something else….wonder if the amp has fried something but cannot detect and signs of it.

On Jul 6, 2013, at 12:21 PM, "Robert Mcgraw" <rmcgraw at blomand.net> wrote:

> What's the antenna configuration?
> 
> Start with a dummy load on ANT 1, antenna switch in #1 position.  If that
> doesn't work, either the input jumper is bad or someone has "monkeyed"
> with the circuit.   An ohm meter check from input to output will confirm
> the ANTENNA switch and HI/LO Z switches are good.
> 
> If you are using ANT 4, is there a jumper between the terminals on the
> rear?  If so, that's only for balanced line.  Otherwise, without the
> jumper #4 will feed a coax or unbalanced antenna.  The fixed caps at the
> rear of the HI/LO Z switch will be two 220pf caps wired parallel for each
> of the 4 positons. Visually confirm that the roller is actually turning
> and the variable C is turning when you  turn the knobs.
> 
> I think most will agree that the tuner will match about anything hung on
> the output if it is working correct.
> 
> 73
> Bob, K4TAX
> 
> 
> 
> 
> 
> 
>> Hi all…
>> I recently purchased a used TT 238C tuner from TT and other than
>> functioning correctly in the bandpass position, it will not tune my
>> antenna system at all!
>> I pulled the cover and can find nothing amiss…
>> It acts like the roller inductor is not in the system and the padding
>> caps on the high z/low z switch are all not correct value.
>> Visually it all looks pretty much like new on the inside.
>> Will call Stan at TT early monday am and see what he says…good thing they
>> warrant their equipment.
>> _______________________________________________
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>> 
> 
> 
> -- 
> Disclosure:
> I am a Tentec Ambassador and compensated according to the Tentec
> Ambassador plan. I serve as a volunteer beta test person for the Omni
> VII, Eagle and Argonaut VI products.   Otherwise, I hold no business or
> employment interest with Tentec.
> 
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