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Heathkit AO 1 Audio Oscillator (schematic) : Free …
https://archive.org/details/HeathkitAO1AudioOscillatorschematic
Addeddate 2015-01-25 04:27:42 Identifier HeathkitAO1AudioOscillatorschematic Identifier-ark ark:/13960/t55f2195t Ocr ABBYY FineReader 9.0 Ppi 72 Scanner
Heathkit Audio Generator Model AG-9A - Antique Radio
http://antiqueradio.com/vintage%20audio/heathkit%20ag9%20audio%20generator%20article.pdf
Heathkit Audio Generator Model AG-9A By JOhN VuOlO ... I found that I had to replace the 6X4 tube as well as the dual 40-µf capacitors in the power supply. That brought the voltages back up. I also had to replace the pilot lamp. The oscillator uses a 6AU6 pentode voltage amplifier and a 6CL6 triode-connected cathode follower. Regenerative ...
Heathkit FM-3 Assembly Manual - antiqueradio.org
https://antiqueradio.org/art/Heathkit%20FM-3%20Circuit%20Description.pdf
The Heathkit FM-3 FM Tuner is a seven tube, AC operated superheterodyne receiver employing high ... oscillator of the standard Hartley type. Since the oscillator and RF signals are both present in the tube, ... it is necessary to "bias" the tubes in an RF or audio amplifier in some manner. This term refers to application of a negative potential ...
Heathkit AJ-11 Tuner - Antique Radio
http://www.antiqueradio.com/vintage%20audio/heathkit%20aj11%20am%20fm%20tuner.pdf
tube V9A (6BN8). The ratio detector does the same job in an FM tuner as it does in an AM tuner. It recovers audio from the modulated IF signal. If the oscillator frequency changes (drifts), a small negative DC voltage is de-veloped in the ratio detector. This voltage is applied back to the grid of the oscillator tube to correct the frequency ...
Heathkit HW-101 microphonic tube and distorted audio
https://antiqueradios.com/forums/viewtopic.php?t=390118
Heathkit HW-101 microphonic tube and distorted audio. I am refurbishing a Heathkit HW-101. I replaced all the electrolytic caps, tightened the PC boards to chassis, checked the tubes, replaced any resistors that were more than 20% above value. …
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Purchased a Heathkit IG-72 Audio Signal Generator
https://antiqueradios.com/forums/viewtopic.php?t=295316
Posts: 534. Location: Cheyenne, Wyoming, USA. I went ahead and purchased a Heathkit IG-72. This is the last tube type audio signal generator that Heathkit produced. I thought about getting it's replacement the IG-18 which is solid state but, again, the statement from the old hamradio operator about his only problem was he didn't build it played ...
Help with Heathkit "Twins" | QRZ Forums
https://forums.qrz.com/index.php?threads/help-with-heathkit-twins.700209/
I have cleaned and cycled the band switch numerous times, and cleaned all the tube sockets, and it has oscillator voltage on all bands. I have a fairly good knowledge of tube type audio circuits and have built and repaired quite a few audio amplifiers, but RF is a bit new to me, and I'm interested to learn this old gear.
Free Heathkit Diagrams, Schematics, Service Manuals ...
https://www.schematicsunlimited.com/h/heathkit
Heathkit Diagrams, Schematics and Service Manuals - download for free! Including: heathkit 309 c rf probe, heathkit 336 hv probe, heathkit 337 c demodulator probe, heathkit 342 low capacity probe, heathkit 2006 technician, heathkit 2007 general, heathkit 2008 extra, heathkit a 7e amp schematic diagram, heathkit a 9a amp schematic diagram, heathkita9c, heathkit a 9c …
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