[Elecraft] Question about K2 pre-amp

[Dave]

Todd

I did notice a slight drop in received audio when doing the "scratchy pot"
mod, but in my fairly quiet shack the audio level is between 9 O' clock and
10 O' Clock - I'm listening to CW on 80m at the moment without the pre-amp
on the K2 internal speaker.

Dave, G4AON
K2 #1892 with most of the A to B mods


----- Original Message -----
From: "Todd Gahagan" <tgahagan@imt.net>
To: <elecraft@mailman.qth.net>
Sent: Monday, January 06, 2003 3:04 AM
Subject: [Elecraft] Question about K2 pre-amp


> Just finished all the mods to bring K2 #726 up to B version status.  I had
a
> little trouble with a solder bridge on the SSB board but once that was
taken
> care of things seem to be back to normal.  I also did the AF "scratchy
pot"
> mod and it took care of the majority of the scratch.  Two diodes were
> installed to comply with the latest mod for strong signal problems.  One
> thing I do notice is that to get sufficient audio I seem to need to run
the
> pre-amp on all bands. It makes a dramatic difference and I can run the
audio
> at about 9:00 with the pre-amp compared to 12:00-2:00 without it.  I
checked
> receiver sensitivity (thanks to N7GS) and we found it to be well within
> specifications.  Also, filter alignment via Spectrogram looks to be very
> good (Thanks much to Tom Hammond for his clear instructions).  The filter
> flattening mod worked very well.  Has anyone else run into this need to
run
> the pre-amp, even on 40 and 80 Meters?  I did not need to do this prior to
> the mods.
>  Thanks,  Todd WA7U