[AMRadio] Ranger Audio... the numbers


Larry Taft ltaft at charter.net
Fri Nov 17 13:02:28 EST 2006


Jack Schmidling wrote:
> Gary Schafer wrote:
>> It's beginning to sound like a partially shorted mod transformer.
>
> I checked the resistances of the transformer earlier in the game and 
> they are nominal.
>
>  >With 20 volts signal on the grids of the mod tubes I would think 
> that >you should see at least 200 volts on the plates??
>
> I have no idea but if mine is off by a factor of 4, would it work at all?
>
>> Could be bad 6L6's.
>
> Or back to a reason for using 1614's perhaps?
>
>
>> Can you easily get high modulator plate current with audio applied? 
>> Will the
>> mod plate meter peg or nearly so if you hit it hard?
>
> Yes.
>
>> If it will that is an
>> indication that the tubes are good and the transformer may be shorted.
>
> Except that the transformer appears to be ok.
>
> To refresh..  we are talking about a max of about 75% modulation on 
> peaks but no problem over modulating at the base line.
>
> js
>




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