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Dynaco AF-6 questions

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Posted on July 27, 2016 at 02:59:49
mstamper
Audiophile

Posts: 2
Location: Connecticut
Joined: February 22, 2013
I finished recapping my AF-6. I replaced every electrolytic capacitor I could find. I was shocked by how many caps were bad. Four were completely open. The rest were leaky. This was time well spent!

My first question: are there any electrolytic capacitors inside the RF front end? I assumed there were not. However, the schematic omits the front end, so there is no way to tell.

Second question: FM is working OK. I am able to tune across the band. Multiplex works fine. However, sensitivity isn't as good as expected. My 1955 mono Harmon Kardon tube tuner (recently restored and aligned by me) beats the AF-6 on sensitivity. I was able to align the Harman Kardon with a signal generator and a scope. Is there anything I can do to the AF-6 to improve sensitivity using these simple tools? Does the front end contain an RF amp? Can the RF amp by peaked with trimmer or transformer adjustments?
Mike

 

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RE: Dynaco AF-6 questions, posted on July 28, 2016 at 07:57:25
JonM
Audiophile

Posts: 90
Joined: December 29, 2000
I assume you're talking about the FM section of the AF-6.

It's the same as the FM section of the FM-5, so maybe this can help with alignment, etc...

 

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