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Hi Mark PIN diode inspiration: https://web.archive.org/web/20240330083557/https://www.frostburg.edu/personal/latta/ee/qsk5/schematic/MA4P4001B-402.pdf

That could be. One thing that web browsers do is a lot of disk writes as they cache web pages. 73 -Jim NU0C "Jeramy Thibodeaux" <kg4azt@...> wrote:

Generally speaking there are two types of tube transfer characteristics: The optimum characteristic can be described as two straight lines: constant transconductance at high input levels, and a second

40m is dead on my TR-4CW and suspect it may be the 21.5 overtone crystal. All other bands check okay. Any suggestions on who could supply me one. Tnx.....Bill wa8bda

Tom, My first thought was thinking a failing or undersized power supply.? Re-reading some of the responses I'm inclined to recommend trying these two things next (No Cost). 1. Hard drive defrag.

Yes, I was part of the discussion. I also posted a link to W8JI's engineering analysis that shows why the indirectly grounded grid circuit was a bad idea. The idea did not originate with Drake and I

There was just some discussion about this, I think in this list. Drake's idea was that the indirect grounding provided some negative feed back which reduced the distortion. That may be desirable even

It is a PITA on an L7 due to the tight spaces. I just did a second one. Works nice. 73 -Jim NU0C "K6OXN Bob" <bobk6oxn@...> wrote:

I have had my L7 amplifier for about a year now, and it was working very well. I recently read and article about grounding the grids on the 3-500 tubes. I had not checked that with my L7. Today I had

Cache is clear. History cleaned. Used chrome Firefox edge. No diff. Ran 2complete virus Chk over 3 hrs. No diff. Nothing found. Tom

I keep thinking that but insides are dust free. No warm parts. Using win10 win defender. Fans all work. Tom

Nice work Mark! You're making progress. It will be interesting to see where you end up. 73 -Jim NU0C "atlasstuff" <g4fph@...> wrote:

Tom, If you are using your PC mainly for email and internet browsing I would suggest installing Linux on for that purpose.? Pick your flavor (I have used OpenSuSE since about 2001) but if you're a

Jim, I found the article from Feb. 1989 by AE7K, entitled 'Zener Diode Noise'. I won't be undertaking 'carpet-bombing' bypassing all of the regulators in my radio! I had previously added the

I just sold one a couple of weeks ago and got $330 for the r4b and t4x. No ps or ms4. [email protected]> wrote:

Hi Guys, Okay thanks, yes seems like the market is soft for a lot of these old radios not too sure where its going to go. I've been slowly down sizing my radio stash to just a few radios that are

FWIW in December I bought a working B-line with absolutely pristine copper for CAD$500 (~US$360). I think it might have come with an MS-4/AC-4, but my memory is too broken to remember now. --lyndon

I purchased a nice set about 6 months ago with some extras (spare finals, mic, keyer, digital display) for $575 Ed KG5UN [email protected]> wrote:

Dave, the prices have been falling a little bit but, as I often say, "condition is everything". If they're fully working with no blemishes and shiny copper, then your price is in the right area. The