[NJARC] Radio Debugging

[Scott Roberts]

Hi Everyone!
I am finishing up my recap on the Hallicrafters SX-16. Today, I
checked the voltages on the tubes, using an  Extech True RMS DMM,
Model 22-816. I am working with about 113VAC house current. 10%
tolerances, per manual. Settings IAW Hallicrafters manual

Readings I am getting are as follows:(Higher than tolerance are
indicated by >, lower are indicated by <.  Pins 1 & 2 not used, 8
[heater] all w/in spec, 9 not indicated. Factory Specs. in
parentheses.Pin 8 ind. as [8] on following line. No entry means
no reading or dead pin)

Tube  Function  3           4           5          6    
6K7    RF Amp  266(275)   114.4(110)   8.4>(7)     
 [8]  8.4>(7)
6L7    Mixer   275(275)   88(100)             
 [8]  2.01(2.5)
6J5G   Osc.    165.5(180)             -3.2(0)    
 [8]     0
6K7   IF Amp1  269.5(270)  114.8(110) 9.7>(6.5)115(140) 
 [8]  9.7(9) 
6K7   IF Amp2  264.6(270)  115(110)   9.6>(6.5) 0.43(0)  
 [8]  9.7(9)
6R7G  2Det AVC 170.8(190)  5.5>(4.5)  5.5>(4.5) -0.4(0) 
 [8]  +5.86(-7)
6V6G  1Aud. OP 302  (315)  268.5(275)  0.3>(0)
 [8]  12.87<(14.5)
6V6G  Output   303.5(315) 267.7(275)0.6>(0)
 [8]  12.84<(14.5)
6J7   Beat Osc. -5<(150) ALL ARE OUT OF SPEC- SW ON/OFF
6J7G  Sig Amp  267.2(275) 121.1(110) 6.59>(5)267.6(300)          
       [[8] 6.62<(8)
  
As you can see, most items are within spec- All pin 5 voltages
are high, and 2DET AVC 8 pin bias is inverted,  Beat Osc. is way
out, and 2 6V6G 8 pins are low. I tried to make the chart
understandable, but working with limited space. (I will send a
copy in excel spreadsheet if desired.)

Any ideas? I am going to work power flow numbers this
afternoon...

Thanks!
Scott

 





      ____________________________________________________________________________________
Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ