Click here to return to the home page.
FM-5 Tuner, with cartridge lamp replacement kit
AF-6 Tuner
The FM-5 tuner was the transistorized successor to their popular FM-3 tube tuner. The FM-5 had auxiliary inputs and a volume control, and so could be the center of a simple system when combined with a power amplifier like the ST-80 or ST-120. It has a good reputation, and good sound, selectivity, and quieting.
Here's a pdf copy of the FM-5 PC-25 and PC-26 assembly and service manual, a really nice scan, so it's a big file (45 MB).
Here's a pdf copy of the FM-5 PC-20 and PC-21 assembly and service manual. It took a couple of years on Ebay to find this one.
Early versions of the FM-5 had PCB's labeled PC20 (RF board) and PC21 (power supply/audio/decoder board). Later versions, the most common ones, the PCB's are designated PC-25 (RF board) and PC-26 (power supply/audio/decoder board).
There's even a really early version of the PC-20/PC-21 version. I know because I got one to repair. You can tell it's this version because:
The assembly manual is a bit sketchy. I'm using this place to collect some measured data to supplement the missing data in the manual
The AF-6 tuner combined the FM section of the FM-5 with an AM tuner, thus the name AF-6, for AM-FM Tuner 6 (a bit of speculation here, of course).
Here's a pdf copy of the AF-6 assembly and service manual, scanned at quite high resolution so it's pretty huge (90 MB).
Dynaco used custom lamps to illuminate the tuning dial. They kind of look like a 3AG fuse, but they are longer and thinner. They are also completely unavailable today. But, there is an alternative coming. We're developing an LED-based replacement that fits into the metal end caps from the original dial lamps. So, save your old cartridge lamps, particularly the metal end caps.
Here's a link to order the lamp replacement kit.
This kit works equally well in the FM-5 and AF-6.
40+ years will make the original RCA jacks pretty well oxidized. That oxidation makes it hard to make good contact, which will lead to hum and noise. You can replace the original RCA jacks with gold-plated RCA jacks.
Here's a link to order the RCA Jack replacement kit