[Heathkit] HG-10B/DX-60 Keying question

[rbethman]

The *best* test for a tube is to place another one in the actual circuit.

It may indeed take two or three before the circuit operates properly.

This has been the way that even old military radio technicians have done 
for decades.

Give it a shot.

Bob - N0DGN

On 6/27/2013 7:45 PM, Curt wrote:
> My HG-10B stopped keying correctly. With DX-60B using a crystal, 
> HG-10B NE-2 lamp shows -59 VDC in standby and lit. Switch to tune, key 
> transmitter causes light to go out, key up and lamp back on.
>
> Using VFO position, -59 VDC in standby and lit. Switch to tune, key 
> transmitter, lamp goes out and stays out, VFO continues to run at key 
> up. Voltage on NE-02 goes to -76 VDC but NE02 stays off (?!). Switch 
> to standby, voltage drops to -59 VDC and lamp turns back on.
>
> Warming up the DX-60B with the HG-10B unplugged, then plugging in the 
> HG-10B the NE-02 behaves correctly until the HG-10B has warmed up and 
> the 6CH8 actually begins to oscillate.  Seems like a tube in the HG-10B?
>
> Both the 6CH8 and 0B2 test ok on my Eico 625, still I am suspecting 
> the 6CH8.  I haven't found this emission tester to be very good at 
> identifying a problem tube unless it is totally dead or shorted.  
> Unfortunately I don't have another 6CH8 to try.
>
> Any ideas would be appreciated.
>
> 73, Curt KB5JO