Hello,
I know both of these turntables. I have refurbished them many times for clients, and I've also had several of my own units. As for the QL-Y5F, it comes from a series of turntables produced in the late '70s. These include the QL-Y3F, QL-Y5, QL-Y5F, and QL-Y7. The ones with the letter "F" are fully automatic turntables. So, QL-Y3F and QL-Y5F. On the other hand, the QL-Y5 and QL-Y7 are semi-automatic turntables, meaning they don't have an automatic start. So, it’s important to note that the QL-Y5 and QL-Y5F are two different turntables, even though they are very similar in appearance. I mention this because people sometimes confuse them.
As for the QL-Y55F, it belongs to a slightly newer series from the early '80s. These include the QL-Y33F, QL-Y44F, QL-Y55F, QL-Y66F, and QL-Y77F.
Regarding the QL-Y5F, it is a very nice turntable. It's one of the first to feature electronically controlled Q-damping and anti-skating. Additionally, its automation is of a newer generation compared to turntables from the '70s. It’s based on electromagnets and linear motors, so it’s smooth and silent. This distinguishes it from turntables like the Pioneer PL-570, which had mechanical automation.
As for the QL-Y55F, as I said, it’s a few years newer. The entire series is a bit special to me. The QL-Y33F and QL-Y44F had their competitive counterparts from other brands, such as the Denon DP-47F, DP-37F, or Pioneer PL-505, PL-707.
However, the QL-Y55F, QL-Y66F, and QL-Y77F did not have competitive counterparts from other brands. I’m talking about fully automatic turntables. Other companies at that time did not produce fully automatic turntables with interchangeable tonearms, electronic tracking force, anti-skating, and Q-damping.
I really like these turntables. The QL-Y55F is very similar to the QL-Y77F in terms of electronics design. The QL-Y77F also has an additional drive brake, a more elaborate drive system, and a taller turntable enclosure.
Both the QL-Y5F and QL-Y55F are very good turntables. However, the QL-Y55F is still a better model. If I had to choose, I would buy the QL-Y55F, even though it’s a bit more expensive. As for the straight and "S" tonearms, if there’s an opportunity to buy a turntable with both arms, I would take it. It’s becoming less common for sellers to offer both arms. Usually, there is only one tonearm. However, tonearms are very expensive on their own. It’s usually more cost-effective to buy a turntable with both tonearms than to buy the second one separately later.
There are a few issues with these turntables. If you buy a QL-Y5F, make sure to replace the capacitors in the power supply. There are several, but 95% of them are leaky and often cause malfunctions.
As for the QL-Y55F, sometimes the STK5416 chip fails. This is a voltage regulator IC. The original ones are not available, but the Chinese produce replacements. You can buy them on AliExpress for $15. I recommend getting one as a spare, because we don’t know how long they will have these in stock. I’ve tested them, and the Chinese ones work. You’ll recognize the malfunction if you turn on the power and the platter starts spinning immediately without pressing "Start". It won’t stop with the "Stop" button, only after turning off the power. I mention this because it’s a common fault.
I’ll also add that both the QL-Y5F and QL-Y55F have important features controlled by potentiometers. These often cause problems. I recommend disassembling and cleaning them.
I made a video when I was refurbishing the QL-Y55F. I show how to disassemble and repair the potentiometers. The video is in Polish, but you can enable automatic subtitles in English.
Here’s the link:
I hope this helps.
Best regards and good luck with your purchase!
Przemyslaw