Nice write up and MUCH better than the Ameritron PDF for the mod. They should contact you about using your writeup. Thank you for the photos - Now I can see what's inside the input tuning slugs and what happens if they are turned in too far.

Your write up says 'after serial number 1240' - that much be an older amp? My amp is serial number AL82-12015.

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Looking at the schematic from Ameritron website, they do show just as you wrote up - wonder why they are not making those revisions to new amps since they have the mod listed on the website under 'Product support'? Do you have a link to the QST writeup? I'd like to read the whole thing.

I need to do more study - I don't fully understand the coax changing. Purpose of change??? Are the coax just paralleled for less loss? Interesting you show adding a glitch resistor - I would have bet money the AL-82 had a glitch resistor (almost sure Tom has said so. TOm???), but the way the schematic is drawn I could easy have missed it. I WILL be following this thread to see other comments. THank you again for posting.

Ken, actually I was not aware of these updates. All the AL-82 amps I have had over the years seemed to work just fine. I never used amps on 17M so if there was a problem with the input I would not have known about it. I am actully surprised about this because I did not know about it. Don't think I saw this on the website unless it was only put up recently.

I did however know that they now use this big glitch resistor in the big box amps. For example, Ameritron went to a dual reed relay antenna system several years ago.

I'll bet it has been 8 to 10 years now maybe, they still show the old open frame relay in the schematics. You know Ken, I emailed with Tom about the dual coax to the tube from the input. For the life of me I just don't remember the reason for it.

I 'think' it may have something to do with the input circuits not being very near to the tube. Eventually he will come in here and explain it all. I went over to the Ameritron site and it kinda looks a bit different then I last saw it, so maybe this info is rather recent. It appears that the changes to the older models appear quite drastic. Removing several turns of the coil seems drastic to me. If you look at the schematics of most dual based 3-500 amps you will find that almost every one is different as far as C1 L C2.

You know Ken, I emailed with Tom about the dual coax to the tube from the input. For the life of me I just don't remember the reason for it.

I 'think' it may have something to do with the input circuits not being very near to the tube. Eventually he will come in here and explain it all. I went over to the Ameritron site and it kinda looks a bit different then I last saw it, so maybe this info is rather recent.