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HG 2SC2904 Used in IC725
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HG 2SC2904 Used in IC725

Use 2SC2904(Produecd by HG) to Repair my IC725

This material comes from "Hello CQ Forum".(Refer to following link)

http://www.hellocq.net/forum/showthread.php?t=280576&page=1&pp=30


I heard for years that a company produces various models of the launch tube, that is the price is very cheap. Over the past few years I design and development of the HF transceiver kit is also many, for lower cost considerations have been using IRF530640 or HEXFET pipe to make the launch tube. Although the effect is also good, but the heart is also very much hope to use professional launch tube. In the QQ group chat with everyone up power, no brakes, brain hyperemia decided to buy several pipe back to try.

Now do power amplifier board is late, then playing the IC725's idea. Because a lot of ICOM radio station in 2SC2904 make use of power tube, on Taobao out 2904 cheaper than imported cheap too much, I remember the original imported 2904 to nearly 300 yuan one. Then 2 days later, received 4 domestic 2SC2904.

Just trying to get 725 of the power amplifier apart, the year of machine design was long, remove the power amplifier is very troublesome.

It's 100 blocks of one only three transistors, I never had such an expensive new three transistors, although is made in china. The new pipe, tube feet bright polished tile.

According to IC725 repair manual, power level of the quiescent current, should be in 300mA. I don't know why, I the machine always in 120mA, in any case also did not transfer to 300mA. Using the original tubes as well, don't know is it right? Have a problem.

Test results, let me by surprise. Domestic 2SC2904 725 can work each band in the output power was to achieve 100 W, and there is no difference between the original pipe. When according to the forum 725 lover introduction method, adjustable power can reach 120 ~ 130 watts. Only for the domestic pipe resistance exercise capacity lack of confidence, finally in 100 watts. Try on several radio, continue for more than 1 hours, the machine temperature and output power are very stable.

Testing this, I feel very accidentally, also feel very excited. This tube is very inexpensive, 100 watts of output power, only need to increase the cost of 200 yuan.

I also learnd from a friend that he use HG 2SC2904 to repair ICOM 700PRO. The transistor works also well.

年前就听说过无锡有一家公司生产各种型号的发射管,说是价格很便宜。但也有人说这家的管子容易坏,加上对国产这类器件多少也带着点不信任的情绪,所以一直也就没太过多的关注。

这几年我设计开发的短波收发信机套件也是不少了,出于降低成本的考虑一直都在使用IRF530,640之类的HEXFET管子做发射管。虽然效果也还不错,但是凭心而论也是十分希望用一用专业发射管。在QQ群里和大家聊起来功放,没刹住车,头脑充血决定买几只管子回来试试。真不行的话,也就损失几百块钱,也让我死了心罢!

现做功放板是来不及了,于是打起了IC725的主意。因为ICOM很多电台都在使用2SC2904做功率管,上淘宝一查2904的价格是100元。这可比进口的便宜太多了,我记得原装进口的2904要将近300元一只。于是2天后,收到了4只国产的2SC2904。

 
费老大的劲才把725的功放拆开,那年头的机器设计的很罗嗦,拆功放很麻烦。
 
这可是100块钱一只的三极管,我可从来没整过这么昂贵的全新的三极管,虽然是国产的。新管子,管脚瓦明锃亮。
 
 
按IC725的维修手册,功率级的静态电流,应该在300mA。不知为何,我这台机器总是在120mA,无论如何也调不到300mA。使用原装管子的时候也是如此,不知道是不是有问题。

测试的结果,却让我大感意外。国产的2SC2904在725可以工作的各波段输出功率居然都能达到100瓦,和原装管子毫无差别。当按照论坛上725爱好者介绍的方法,调大功率可以达到120~130瓦。只是对国产管子的抗操能力信心不足,最后还是调在100瓦。晚上试通了几个电台,继续了1个多小时,机器温度及输出功率均十分稳定。

测试到此,我感到十分意外,也感到十分兴奋。这种管子价格很低廉,100瓦的输出能力,只需要增加200元的管子成本。

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