[Boatanchors] Tube Oscillator Circuit Question

[Walt Cates]

You state that the plate and screen both measure 151vdc.

What is the B+?

100K plate resistor seems a bit high.

 Walt Cates, WD0GOF
https://wd0gof.com/Hallicrafters

A majority of acceptance is not proof of correctness.
https://wd0gof.com/bible-study/commentaries/


________________________________
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of whitebear1122 at comcast.net <whitebear1122 at comcast.net>
Sent: Sunday, December 13, 2020 12:02 PM
To: boatanchors at mailman.qth.net <boatanchors at mailman.qth.net>
Subject: [Boatanchors] Tube Oscillator Circuit Question

I am working on resolving one of the two remaining issues with my HBR-13 12
tube dual conversion superhet receiver.  The receiver works but the BFO
waveform has bothered me since I built it.



The output of the oscillator is not a nice sine wave as I was expecting.
The photo shows the oscilloscope at the oscillator plate pin 5.  Amplitude
is about 96 volts p-p.  I pulled the tube to measure DC voltage applied to
pin 5 and 6,  151v.  The waveshape on the tuned circuit side pins 1 and 2
looks good, a normal sine wave.  I just don't know what I'm seeing.  Any
advice is appreciated.  Thanks. 73, Scott WA9WFA



https://www.qsl.net/wa9wfa/HBR13_BFO

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