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Old 2nd Nov 2019, 7:49 pm   #1
ChristianFletcher
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Default Avo signal generator HT voltage

I have a very sick Avo wide range signal generator. Found it to have a burned out output attenuator and the Transformer Secondary HT line is burned out. I was wonder if anyone had one and if you could measure dc voltage across the main smoothing electrolytics. I have it Basically working now off a bench power supply but cannot get the LF oscillator to do its business. I have it running around 200Vdc at the moment the L63 suggest 250v. Unfortunately I have already let the smoke out once so hoping someone can confirm the HT for me before I get silly with the HV.

Any help much appreciated

Best regards Chris

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Last edited by ChristianFletcher; 2nd Nov 2019 at 8:07 pm.
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Old 2nd Nov 2019, 8:39 pm   #2
ColinTheAmpMan1
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Default Re: Avo signal generator HT voltage

Is this what you are looking for?

http://www.vmarsmanuals.co.uk/archiv..._Generator.pdf

Colin.
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Old 2nd Nov 2019, 9:07 pm   #3
ChristianFletcher
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Default Re: Avo signal generator HT voltage

Hello Colin

Thanks for the manual. Unfortunately it’s the DC voltage I need on the smoothing capacitors. Unfortunately the manual only states the AC input to the transformer and the schematic just shows the transformer links for various mains inputs. I am hoping someone that has one will measure the voltage across the two electrolytics for me with the unit powered up.

Thanks again Colin very kind to dig out the manual.

Regards Chris
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Old 3rd Nov 2019, 12:05 am   #4
ChristianFletcher
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Default Re: Avo signal generator HT voltage

Ok looks like 280 on first capacitor and 180 on the second smoothing capacitor.

Thanks Andrew
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