[R-390] re; R211

[Flowertime01 at wmconnect.com]

W. Li

The oven may have stuck on some where in life and toasted things in that 
corner of the deck.

Running the 2 crystal oven without heat would be OK. Not as great as with 
heat but the receiver will stabilize at some temperature and operate well. 
You can then align the receiver to whatever the crystals want to operate at 
without extra heat.

R211 is a plate resistor for V207 first crystal osc. Figure 5 page 21 shows 
the resistor as 8.2 K. You could be looking at a paint color change on an 
old resistor. Or a cooked resistor. Or a receiver that was built wrong and 
you are the first person to ever look at the real problem for its weak 
performance.

I would go with a 8.2K resistor in the circuit as shown at least twice in 
the R390A TM and the Y2K manual as derived from the Navy publication. 8.2K is 
more in line with the mixer resistors than 82K.

I think all the R390A's will show the deck under the crystal heaters to be 
somewhat toasted.

Other areas that show toasting are likely from a tube that went bad and 
caused excess current to flow. I would examine the resistors in all the toasted 
areas to see if any are out of specification.  Heaters toasting areas can 
mask other problems that may have occurred.

Roger Ruszkowski AI4NI