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Old 16th Sep 2018, 7:53 pm   #1
martin.m
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Default Advance E2 signal generator

I bought this generator as untested from an Internet auction site and decided to have a quick look inside before plugging it in. The 6X5 rectifier valve was missing and closer inspection revealed a vintage modification consisting of a metal "top hat" silicone diode wired from one of the anode pins to the main smoothing can. The 6X5 is connected as a half wave rectifier in this model. The repairer had thoughtfully included a surge limiting resistor in series with the diode but had inadvertently bypassed a 560 ohm resistor that had been in series with the valve's cathode. I fitted a used 6X5 and restored the circuitry to it's original state. Switching on produced RF output, tested by plugging a short length of wire into the output socket and placing a transistor radio nearby. However there was no AF modulation tone or any AF from the output socket. The Advance uses one half of a 6SN7 double triode for an AF oscillator, with the other triode used as HT regulator and modulator for the RF circuits. Following advice on this forum I replaced the two .05uF capacitors connected to the AF oscillator transformer, using 1000v types. This restored full operation.

I noticed when testing at VHF that with a short piece of wire connected to the "full RF" output socket, I could easily wipe out a transistor radio 30 feet away that was tuned to our local FM station. A little RF can go a long way.
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Old 16th Sep 2018, 8:26 pm   #2
Sideband
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Default Re: Advance E2 signal generator

These are great little generators. I wouldn't mind betting that if you check it with a frequency counter, you'll find it pretty accurate.
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