The Heathkit GD-125 Q Multiplier

[@ottaviocarmelo3971]

Fantastic video.Very informative. Thank you

[@Littlelewie151]

Always very impressed with your videos! Very professional to say the least!

[@w2aew]

Jeff - very nice review of Q multiplier - a great example of useful circuits that are fading from existence due to advancements in technology. I tweeted a link to this video.

[@WillettPR]

Excellent video. I build a Heathkit Q Multiplier to go with my Drake 2B receiver for CW back in my K1ZRK days in high school. The two together had outstanding selectivity for CW, I used to do quite a lot of CW DX with this and my forty foot vertical antenna on our roof. I also built a fine Heathkit superregenerative receiver from a kit, prior to upgrading to the Drake 2B.

[@wa4aos]

Another great video of vintage Heathkits.. Thanks for taking the time to make these! 73 Glenn WA4AOS

[@colinsnowphoto]

Great video series. I built this same setup (GR-64 + GD-125) plus built an RF Preselector "Ferret" from Popular Electronics March 1968.

[@douglasthompson8927]

I`m using one tonight..hopefully the band will open up soon and I`ll be able to pick up Radio Havana...I could use some good news right now..eh ?

[@lovetheblue6659]

Nice video! I knew that many older "up scale" shortwave radios included integrated Q-Multipliers, but this is the first time I've seen one demonstrated. The combination of peak and notch modes seems to provide incredible versatility. Due to the utilized IF frequency, I suppose these were relegated to single-conversion sets only.

[@lynndarling1139]

Just bought one off ebay from an swl who just built it from a n.o.s. kit. To use on my GR-64 also..thanks for the info.