[Elecraft] K2 Rev A to Rev B Upgrade

[Don Wilhelm]

Ralph,

Yes, the A to B mods are worthwhile.  I have done many of them.
Download the K2 A to B instructions and look at the first page to see 
the entire list of associated upgrades.

The only 2 mods that are not listed there are the K2 Keying Waveshape 
Mod and the Extremely High Signal Handling mod (2 back to back 1N4148 
diodes at the input of the IF Amp).  The K2 Keying Waveshape Mod kit was 
withdrawn because the PIN diode is no longer available in thru-hole 
format, but Elecraft has a substitute that is used in new K2s.  I can 
send you the instructions - if you want the instructions, send me a 
private email.

With that serial number, you will find added benefit if you change the 
IF crystals on both the RF Board and the KSB2 option.  While you have 
the crystals off the KSB2, it is an easy matter to change the filter 
capacitors to widen the OP1 filter to 2.4kHz from the older 2.1kHz 
bandwidth.

While you are at it, change the AG Gain pot and install the Alternate AF 
Gain Wiring mod.

I am not certain how long it would take someone to do all the mods doing 
it for the first time.  It takes me less than a day, plus a couple hours 
to do the alignment and test, but then I have had a lot of practice.

73,
Don W3FPR

On 4/21/2017 10:59 AM, Ralph Perreca wrote:
> Hi All
> I purchased my Elecraft K2 several months ago Ser # 1913 firmware 1.06F 1.02 with ATU And SSB options I am considering doing the Rev A to Rev B upgrade and would like some feedback as to whether it is worth doing and why as well as approx build time for a builder with average experience I have built several small kits and the Elecraft K1