KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org. No AI is used to generate this content.

Saturday, December 31, 2016

A simple push-pull audio amplifier using russian rod tubes and power transformers

As one sometimes does, I was perusing EvilBay a while back and saw some ex-USSR sub-miniature pentode tubes for sale. In looking up the par...

Monday, December 19, 2016

On the winding of power chokes and transformers: Part 3 - The plate (high voltage) transformer

This is a follow-up of two previous posts in this series: On the winding of power chokes and transformers: Part 1 - Chokes - link On the...

Friday, December 9, 2016

Repairing the power switch on the Kenwood KA-8011 (a.k.a. KA-801) amplifier

Back around 1990 my brother mentioned to me that there was an amplifier, in a box, in pieces, in the back room of the TV/electronics store w...

Monday, November 28, 2016

On the winding of power chokes and transformers: Part 2 - A filament transformer

Having wound the choke described in the previous installment about chokes - (link) - I decided to proceed with the next logical step in the...

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