[Elecraft] Rev B mods list (corrected)

[Don Brown]

Hi

I left a mod off of my list so here is the corrected list. The list is not
in any particular order and is not a recommendation of an install sequence.
Some mods are for convenience and have no effect on performance you may or
may not want to do all of them. If you want to bring your K2 up to B status
then you should do all of them.


1  PLL - remove X2 and add R19 220 ohm
2  BFO - change out L33 with new toroid
3  D10 - replace with low drop diode
4  ALC - change R16 100K, R10 470 and add D8
5  10/12 meter - change value of C42 330 pf, 45 1 pf and 48 330 pf
6  RFC15 - add 100 uH choke to U4 supply line
7  RFC11 - change to 100 uH toroid choke 20 turns on FT37-43
8  add C28,29 - 12 pF across C21 and 23
9  change value C30,36 to 470 pF
10 add C224 - in series with P6 AUX RF .047 uF
11 change value C225 390 pf, 226 680 pF, 227 330 pF, L25 14 turns, L26 12
turns
12 audio pot mod - several cut runs and jumpers on front panel, RF and
control boards
13 sine wave side tone - add R11 47K and L1 82 mH
14 AGC threshold - add 50K pot at R1
15 voltmeter switch - remove and replace with jumper
16 added filtering on voltage sense - add cap at C17 .01 uF change value C42
.1 uF
17 D19,20 and C71 for future 60 meter option - add varactor diodes and
change value C71 82 pF
18 change R60 to fixed 100 ohm resistor
19 new crystals for CW and SSB - replace 14 crystals with more closely
matched set
20 AUX BUSS filtering - change value R6 100 ohm, R64 100 ohm and C12 .0027
uF
21 2nd XTAL filter mod - add 2n2904, 2 caps and resistor to bottom of RF
board


I may have missed some more. If anyone finds anything else I missed let me
know

Don Brown
KD5NDB