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Yes the older LA-1K's are auto voltage sensing. I just had this discussion with Mark @ Palstar. My amp was built in 2018. Palstar said they staterd using manual switch PS's about 3-4yrs ago.? Billy

I purchased a used OLDER LA-1K, then sent Palstar the SN (32379). They informed me that it was one of the early models and would benefit from an upgrade to some of the circuit boards so I sent it back

Out of the box the LA-1K is not capable of full QSK but can be made so with an external electronic T/R switch such as the DX Connections QSK-2500. If you operate CW, use only the Direct Keying option.

Hi David One issue I am aware of and have experienced on the LA-1K 2018 vintage. The ALC and PTT RCA phono jacks on the rear panel are not mechanically secured, only via solder to the circuit card.

Mine is. It came with 220 and 120v cables. If your not sure, I would give them a call first before trying as if the switch on the side isn’t changed and wrong voltage you wont be happy.

Looking at a used LA1k anything specific I should be aware of ?? 2019 vintage if that matters :) -- David -W7GEL

So are the older units auto sensing voltage? -David W7GEL

I had an issue with the LA-1K where they had put too much heat sync compound under the finals, and when it heated up, it oozed out from under the transistor and arc flashed.? Luckily, I was on SSB

I probably didn’t phase that right, this is how my equipment is set up. Radio Ant 1 to LA-1K > LA-1K Ant 1 to HF-Auto > HF-Auto connected to 3 antennas My setup is how it is described in the

Craig, Thanks, that parallels my experience. Antennas in trees aren't the best combination I guess. I have never seen the sparking but I wouldn't be surprised given what you said. My tube amp somehow

You say the HF Auto in front of the LA-1K. I run my HF Auto after the LA-1K. Sent with Smoke Signals from my camp fire. ? [email protected]> wrote:

Frank, My LA-1K has been in the shop 3 times for the same replacement of the Q1 LDMOS chip. I run a couple wire antennas up in some Doug fir trees. The 160m antenna is a full wave with a very low

Sorry to hear that Frank. Not sure. I have a lot of contest hours on my amp and been rock solid knock on wood. I made over 1500qso’s on 15m past weekend with full 1kw out and usually run the ssb

Frank,?While I can't comment on what happened exactly to your amp, I will say that tube amps are much more forgiving of SWR being a little high. I have been using the Palstar HF auto tuner for a year

Fred,?Thanks for the response. I was told the amp was 5-6yrs old, so that sounds about right. Appreciate the info on the voltage switch as well. I will call Palstar and get the exact year.? Billy

Hi Billy, Palstar changed power supplies in late 2021/early 2022. The older ones do not have the switch. My LA-1K is about 300 higher than your serial and was purchased new in

Hello all,?Just got a used LA1K yesterday. Anyone got info on serial numbers? Just curious how old it is. S# 30659. Also, I noticed in the book it mentions a switch on the side of the amp for

I was operating the CQWW SSB contest yesterday on 10M.? My SWR is fine on that band, as shown my by almost 100 Q's before having a problem.? Then it just went into bypass mode and when I reset it to

This is the one I used recently. engineering2@... Byron KN4PHS

It is best to call them; been this way for a while. Good Luck. [email protected]> wrote: