HG-10B questions

[Garey Barrell]

Tom -

Um, Pin 6?   Pin 6 is an "IC" (internal connection) pin and shouldn't 
have anything connected to it.   Apparently Pin 7 is the only one of the 
2, 4 or 7 that was wired.  Those three pins are tied together inside the 
tube and any one of them should work.   Pins 1 and 5 are also connected 
inside the tube, and usually the HV is brought to one and the regulated 
voltage is taken from the other so that if the tube is unplugged the 
rest of the circuit doesn't see the full HV.

Sounds like the builder was used to octal sockets and thought that Pin 7 
was one pin from the "other" end!  :-)

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>



TChesek at Epix.Net wrote:

>Garey Barrell got my brain reset with his suggestions. I found that pin 6 of
>0B2 was tied to ground instead of pin 7. I corrected the wiring error and
>now get +107v. The previous owner used this VFO with an HW-16. I wonder what
>his "quality" of life was. Pin 7 NEVER had solder on the lug so this has
>been this way since being built. Thanks!
>
>Tom k3tvc
>
>----- Original Message ----- 
>From: "Garey Barrell" <k4oah at MINDSPRING.COM>
>To: <HEATH at LISTSERV.TEMPE.GOV>
>Sent: Monday, February 28, 2005 2:01 PM
>Subject: Re: [HEATH-TEMPE] HG-10B questions
>
>
>Tom -
>
>If you are measuring 174V on pin 5 of the 0B2, it's either defective or
>miswired!   Pine 2, 4 and 7 should be 0V, and Pins 1 and 5 should be
>108V or very close.  The 0B2 should be illuminated key up, and dim only
>slightly key down.
>
>73, Garey - K4OAH
>Atlanta
>
>Drake C-Line Service Manual
><http://hr99.home.mindspring.com/R-4C_Servicez/>
>
>
>
>TChesek at Epix.Net wrote:
>
>  
>
>>While trying to operate this past weekend's AM QSO party a station told me
>>    
>>
>that it sounded like my signal was "FM"ing. I notice that when I spot this
>VFO I get noise in my receiver mainly when spotting but also get some noise
>without turning the control. It sounds as if I'm turning a noisy pot rather
>than a variable cap. I am using a DX-60A with this unit. The DX-60A is
>providing +347v to the VFO. R11 in the VFO is to be 10K and reads 10.6k
>which is within tolerance but it is only dropping the +347v to about +174v.
>The schematic calls for +108v at pin 5 of regulator 0B2. I swapped the 0B2
>with a known good one and the voltage is more stable (I noticed the 0B2
>would flash about 2 seconds after every transmit-the replacement does not do
>this) but it is still in the +174v range. The original 0B2, replacement and
>osc tubes check good in my Allied tube tester. Is my hv too hot at +174v?
>Can someone measure theirs and tell me what they get?
>  
>
>>73 & thanks,
>>
>>Tom k3tvc
>>
>>
>>    
>>
>
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