VIKING2 OUTPUT LOW, THEN CREEPING UP...

[ve6pg]

..hi from tim...my viking2 when i throw the plate switch, has abt 50 watts output, low grid drive, then creeps up to where it should be...this takes about 30-40 seconds....then all is fine...plate current, drive levels etc...
...any ideas?..

tnx..

..sk..

[n2ry]

check both 5r4gy's, same thing happened to my dx-100b, i had a non working 5r4gy, filament went and it was stone cold, took the one left a bit to get up to speed

rich
n2ry

[KA0HCP]

It's a sad tale we often hear this time of year.......'slow electricity'.

Try leaving a circuit cracked open so the electrons can flow, and open the door on the circuit breaker panel.

Good luck! 

[WD5JKO]

My bet might be one of the following:

soft 6146's

soft 6AQ5 RF driver tube

LV B+ problem

If the above three items were OK, and the HV B+ was sagging, then the 6146 grid drive would be plentiful from the start.

Also try it with a crystal if using a VFO.

My 2 cents,
Jim

[WQ9E]

I would add one thing to Jim's excellent list:  check the parallel mica caps that couple the driver to the final grid.  These are prone to failure.

[WA1GFZ]

Check the 18 K resistor in the VFO. Last one I did measured 40K and still worked.

[W1AEX]

Check the 18 K resistor in the VFO. Last one I did measured 40K and still worked.

Yup, when my Viker had wandering grid drive last winter, it turned out to be the 18k Chernobyl resistor, which actually crumbled when I removed it to install its much huskier replacement.

[w1vtp]

Check the 18 K resistor in the VFO. Last one I did measured 40K and still worked.

Yup, when my Viker had wandering grid drive last winter, it turned out to be the 18k Chernobyl resistor, which actually crumbled when I removed it to install its much huskier replacement.

Could that not be checked by subbing a Xtal and see if grid drive comes back up?  That would half split the problem VFO or VIKER