I am looking for someone to repair a Henry SS-750 amp. I purchased this amp a couple of years ago at first it appeared excellent however months later (after my PayPal protection period expired) I ope
IF you compare fully automatic tube amps with fully automatic tube amps, I concur that pricing is similar. You did not include tube Alpha 9500 $7,995 or the following solid state amps in your summary
For some reason contesting.com has become less user friendly. You should be able to search through the archives here: http://lists.contesting.com/archives//html/amps/ John KK9A Jim Thomson VE7RF Lost
I believe that the tuning of a tetrode is different than a triode - correct? Are they tetrodes less reliable or more finicky? John KK9A I get a kick out of this tube thread. But let me try to add som
Guido, ik2bcp did state that the "commercial" amp was a OM4000A driven with 15-20 watts. John KK9A Leigh, It would be too difficult to diagnose why the user had both tubes go out in his commercial am
I have operated RTTY with my K3S in the 11 watt range not knowing that this was bad for the LPAs. It would be nice if the Elecraft K3/K3S would allow the option to turn on the 100 watt power amp and
Unfortunately a station ground does not magically absorb unwanted RF. I do not even have a ground rod connected to my transceiver. I am not sure why one amplifier would cause RFI and another one woul
Great advice on purchasing the ARRL Grounding and Bonding book. W8JI addresses the shack ground rod https://www.w8ji.com/station_ground.htm Note that if it is not connected to a SPG the shack ground
Also N8LP offers fantastic customer service. I own two LP100A watt meters. John KK9A Yes, but the LP100A is a FAR more capable wattmeter. 73, Jim K9YC _______________________________________________
Why 2KW instead of the standard 3KW? The LP100A is not an old fashioned analog meter. The power accuracy is better than 5% at any frequency from ~1W to maximum, 3% typical with NIST traceable factory
What a quick and accurate response you got on AMPS to your 2K-4 issue! GL John KK9A I was not thinking about checking the continuity in the tubes themselves when I balked at opening up the amp deep e
difference what power level you use with an Elecraft KPA1500. See the Elecraft post on efficiency in the link below. I am not an amp guru but I believe SPE Expert amps have different PA voltages whi
And what is the KPA1500 fan noise level at 90°C? John KK9A <When I'm contesting on HF, always at 1.5kW, I've seen temps at 90 C, the <fans run faster, I'm happy, and the amp is happy. <73, Jim K9YC 9
I concur that with proper use and even with an occasional oops wrong antenna, an 8877/3CX1500 will last a long time. Still it nice to know where to get replacements if needed or wanted for spares. Do
It should be very easy to make. McMaster-Carr has lots of brackets, bracket blanks and raw materials: https://www.mcmaster.com/finish-your-own-corner-machine-brackets/ John KK9A Is there a source for
RF-Kit RF2KS now comes fully assembled and the reports are that it is quiet, unlike many LDMOS amplifiers. John KK9A On June 2nd I asked this same question, but directly to RF Kit. And the answer as
PEM nuts are self clinching nuts manufactured by Penn Engineering. Other companies make similar nuts. Self clinching studs are also available. They are a common sight at metal manufacturing companies
If you have a perfect antenna/coax system with no mini arcing occurring, the Acom 2000A is a fantastic amp. WOW, $2,000 for new tetrodes! GL, John KK9A GU-74B is the correct tube and here's a link th
Array Solutions no longer sells Acom amplifiers so it is unlikely they will restock their GU-74B stock. Array Solutions now sells OM Power amps which use FU-728F tube(s): https://www.arraysolutions.c
It was not a personal attack to correct and incorrect post. The code violation for a neutral carrying current statement was miswritten and I am glad that this mistake was quickly corrected. This is a