[R-390] R-390A Effects of oscillators low output levels

[jgedde at optonline.net]

Larry,

I just quickly ran through the paper you wrote and my experiments with my 220k R390A (converted back to 56k) confirms your results.  I'll read in more in depth later sine I have to run off to work.    At 200k in the 17 MHz oscillator and the PTO, I found some tubes (new ones) wouldn't even oscillate.  At 56k all tubes work more or less the same and give me strong outputs.

Thanks for taking the time to do those tests and write up the excellent paper.

John

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of Larry H
Sent: Friday, May 24, 2019 7:08 AM
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: [R-390] R-390A Effects of oscillators low output levels

I just finished a document about what I found in the formal R-390A documents and the Pearls about low or high oscillator output on all 3 conversion oscillators.  I also did some testing and measuring about low output and documented it for you to see.  I think you might be surprised about what I found.  It's attached.

Let me know what you think.

Regards, Larry