[Elecraft] U4 of the KLPA3A part number

I own a K3s and U4 of the KLPA3a low power amplifier has failed. As the schematic for the KLPA3A does not show the part number for U4, does anybody know the part number so I can but a replacement? Thanks, Hal W7YNC __ Elecraft mailing

Re: [Elecraft] Field Day Operation

Dave, et al, The K3s is one of several 1.8 to 54MHz transceivers that has suffered the consequences of using VMOS FETs in their final amplifiers. And some, even if tuned as well as possible to minimize splatter, will not be considered friendly neighbors on the congested bands of today.

Re: [Elecraft] K3/100 TX problem on 20m

Do the TX gain parameter numbers have meaning such as dB or are they just relative numbers ? 73, Hal W7YNC > On 03/05/2024 6:35 AM PST Michael Carter via Elecraft > wrote: > > > Hi Paul, > > Could you please post the TX gain parameters > recorded by the K3 Utility at the 50 watt level >

Re: [Elecraft] K3/100 TX problem on 20m

Hi Mike, Thanks for the gain information. I am going to look at the the gain numbers and see if there is any correlation with the wildly different input impedances to the output lowpass filters. For reference, I found the input Z to the filters to be as follows: 160: 63.8 +J1.6 80: 35.7 +J5.1

Re: [Elecraft] KPA1500 schematic file

All the more reason the schematic should be public! > On 05/02/2024 4:55 PM PDT Dr. William J. Schmidt wrote: > > > That thing just isn't that complicated... I've reverse engineered a lot of it > having to fix mine a few times... > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ