[Hammarlund] HQ-170A VHF VR tube??

Peter A Markavage [email protected]
Tue, 27 Jan 2004 12:15:31 -0500


Since the resistor change from 3K to 2K has to do with the addition of
the additional tubes in the 2 meter converter/6 meter preamp, are you
measuring the voltage with the VHF section turned on(volume control knob
pulled out). The regulated voltage feeds the 4 tubes in the "VHF" box?
Pete, WA2CWA

On Tue, 27 Jan 2004 9:45:45 -0600 Craig Roberts <[email protected]>
writes:
> Pete, WA2CWA, said: "In your original post...you said this was a 
> HQ-170A VHF receiver. If so, then R53, the 10 watt resistor going to 
> the OB2, should be 2K, not 3K. ...if its just the 170A, then 3K is 
> fine."
> 
> Hmmm.  It's all very confusing, really.  My receiver is indeed an 
> HQ-170A VHF.  However, if I use a 2K dropping resistor at R53, I get 
> 143 volts on the regulator tube socket -- which seems too much for 
> the specified OB2 tube (but is correct for an OA2).  If, however, I 
> use a 3K resistor as specified in the HQ-170A (non VHF)manual, the 
> voltage drops to 104 volts -- which is just right for the OB2.  
> 
> Does anyone else have an HQ-170A VHF?  If so, what is the value of 
> R53 and what regulator tube does your receiver use.
> 
> Many thanks, as always,
> 
> Craig
> W3CRR