Currently, the electronic tube is Beijing FM30
The Russian brand name of FU29 is FY29, and its American brand name is 829B. It is a composite tube that encapsulates two triodes in the same glass shell. When used in a parallel single-ended class A power amplifier, it involves parallel connection of units with the same internal parameters within an electron tube. The FU29 has a filament voltage of 6.3V, current of 2.25A, plate voltage of 600V, screen grid voltage of 200V, zero-signal plate current of 40mA, and full-signal current of 110mA. The grid bias voltage is -18V, and the optimal load impedance from the plate to the screen grid is 13750Ω. When used in a parallel single-ended configuration, the output power (effective value) reaches 10W. The circuit of this amplifier is simple, with a composite tube 6N3 used for the pre-amplification. This allows a single channel to complete the power amplification task using just one 6N3 and one FU29, and it provides a single-ended pure class A power output of over 10W. The actual thrust and sound quality are superior to or even better than those of 300B. Despite its compact size and unique design, this amplifier boasts strong thrust. Do not compare the actual thrust of this electronic tube amplifier with that of general transistors or digital amplifiers, as its high supply voltage and unique output structure result in relatively small changes in output internal resistance for both high and low-frequency signals. It has excellent low-frequency drive capability and produces a smooth, warm, and delicate sound. This is also why electronic tube amplifiers have not been completely replaced by new technologies.
Currently, the production dates of the domestic electronic tubes we have in hand range from the 1960s to the 1980s. The meticulous craftsmanship is astonishing. It's hard to imagine that we could produce such intricate and complex products in that era, and the consistency is impressive. After conducting comprehensive comparisons between the EL34 and 300B, which are highly recognized in the market, we find that the sound of the FU29 is remarkable and on par with these internationally renowned tubes. Our domestic products also have their proud moments. The FU32 electronic tube amplifier we previously produced has achieved good sales in both domestic and international markets, with a return and repair rate of essentially zero. It can be seen that in any era, as long as the product is excellent, it will gain recognition from the market and users. We will continue to strive!
Initially, we thought that there should be a considerable stock of such electronic tubes in the domestic market. However, when we were working on the FU32 power amplifier, we discovered that it was not as we had imagined. As the number of electronic tubes available on the market decreased, merchants continuously raised prices, forcing us to adjust our selling prices multiple times. The same goes for the FU29 electronic tube used in this machine. When we started searching, we found that many sellers were selling them, and each had a considerable inventory. However, when we actually made the purchase, we found that only a few had real stock. Therefore, the number of electronic tubes we actually obtained was limited, and the number of machines we could produce was also limited. Players who are interested should act early, as these might disappear any day
This device is suitable for pushing general bookshelf speakers and some floor-standing speakers with high sensitivity. It has been enhanced with a new Bluetooth 5.0 receiving module, facilitating wireless connection with portable devices such as mobile phones.
