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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 31st May 2020, 4:54 pm   #81
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Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 6,808
Arrow Re: Building A VHF Amplifier For Valve Sets

Originally Posted by Radio Wrangler View Post
It's a common fault in teaching. Throw the mathematical proofs at 'em before showing them how something can be used and what it will do for them.
Which is exactly what I found taking my technical education through ONC electrical engineering and then through three years to HNC+. Even at a junior level of transistor teaching, at no point was the subject of 'how to bias a transistor correctly' even hinted at.

Chard, Somerset - The home of powered flight and prosthetic limbs.
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Old 1st Jun 2020, 11:33 pm   #82
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
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Default Re: Building A VHF Amplifier For Valve Sets

I wonder if OldtechFan96 has tried remaking this amplifier on a groundplane yet? It's also worth having a look around to see if there are any noisy battery chargers for laptops/phones nearby. These will limit the benefit of any preamp as they can generate lots of RF interference that the preamp might pick up via the antenna or the preamp wiring or by common mode effects on any coax cable. Even having a computer nearby can cause problems, the cable connection to the computer monitor can also leak interference over a short range and that might spoil things.
Regards, Jeremy G0HZU
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Old 2nd Jun 2020, 7:25 pm   #83
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Location: Newcastle Upon Tyne, Tyne & Wear, UK.
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Default Re: Building A VHF Amplifier For Valve Sets

The VHF amplifier is in the to do queue at the moment. I will recommence things when I get a better understanding of groundplanes and circuit building.

I think I'm lucky as I've never had issues with computer borne interference.
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