Evenin Folks, I was researching some capacitor related information and I stumbled across this presentation given in March of 2011 at the Applied Power and Energy Conversion Conference. APEC Conference

Hi Warner, The 7500 is very easy to work on. Board layout is not too cluttered, with a fully removable bottom plate and everything is well marked. The recipe to mod a 7500 is well documented over on t

Hi Warner, Ed: Just to clarify, the 6.8 µf bypass caps were for an Integrated Amps main PS caps and would not be appropriate for duty in your typical tuner environment. Regards JohnC Ask Johnacarp. I

Hi Charly, I posted copies of both the Owners & Service Manuals here: J75 Users & Service Manuals I can't help with the plastic station markers, but in a pinch once I made some using a laser printer,

Hi Jeff, If memory serves, the PME60T2 is a MilSpec 1%, Metal Film, part Manufactured by Aerovox and is a equivalent to a Dale RN60 Regards JohnC the Orange R429, which is labeled PFR 7617 PME60T2 15K

Hi Don, et al, Unless I've read this completely wrong, there was a change in E-Pay charges about a month ago. They now include the cost of shipping when calculating their percentage. I believe the fee

Hi Don, et al: Thanks for checking, not to belabor this topic since its sorta Off Topic, don't forget the additional 3% you have to give PayPal, and whatever listing fees are incurred. Looks like a ty

Hi Folks, Theres been a KT 815 on and off the bench for the last six months. I researched and read the comments on the TIC related to the tuner and checked the archive here for some insight and surpri

Evenin Ed, Pete, Relay RL1 is normally CLOSED, verified on my workind 7500, power off. Regards JohnC

Pete, Ed, There should be a white dot on the corner of the relay that is adjacent Q11. Calling that Pin1 (??) I have continuity to the pin directly across from it, that is, on the other side of the re

Hi Pete, First to correct a prior statement, the relay is normally OPEN, not closed as I previously indicated. DUH! When I check the 2 middle pins (2/3) they show OPEN YES! Just to be clear, when you

Evenin Pete, I confirmed Post 9 , 14.8VAC with 120VAC Supply JohnC

Hi Charles, Thanks for the additional info, I just read through your AK postings, very nice. If you want another copy of the schematic this one is a very nice, clear scan: KT-815 Schematic You may hav

Hi Warner, On the 7500 its a "Multiplex Filter" setting on the Selector Switch. The short answer is it reduces high frequency noise sometimes encountered when receiving a stereo signal. I have a pdf c

Maybe we could come at the from the perspective that you already have an un-metered variac/autoformer, and what would it take to build a module that housed a Voltage and Amp/Watt meter that would be u

Hi Alex & Tobi, There are three things to address, two of which you already identified. First, The "wee box" is actually a cover to the voltage adjustment. Remove the 2 screws and you will see 4 volta

Hi Jim & Bill, Far from being an "expert", and since a picture is worth a thousand words, here's some pics of the OpAmps, de-coupling, and PS of a completed 8300. As for the PS bridge, I believe it wo

Hi Jim, As Don pointed out, if you go to the web page you can access individual messages, you also have available the "Advanced search" link, which allows you to search the entire message database for

Hi Drew, Since you have opted for the sanding/priming/painting, here's the procedure I normally use. As Bob suggested, 400 grit 3M Wet & Dry sandpaper. Use it wet, a small stream of water helps clear

Hi Folks, For those of us who have un-metered autoformer and would like to add some instrumentation, attached are a couple of pictures of what can be assembled. The total cost of the project was under