Does anyone have any experience with tubes from this company or this tube in particular? Are they any good? Also, where can you purchase these?

Might be worth a try, as the used vintage ones are selling for 250$, asking, on ebay. I did not see any of the Chinese 50s on there, though.

In view of the checkered (to put it mildly) reputation of parts in general, and output tubes in particular, from that particular quarter of the earth, I wouldn't trust it.

Your choice, however.

L

Shuguang factory has been around for a long time. Middle of Nowhere, I remember passing the town on the overnight train from Beijing to Sanya. Talk about Orient Express, ubelievable.

That was 10 years ago, so dunno. Did get some 2A3 and 6L6GB from earlier production and they are great!.

Surely replicas of the type 50 would be difficult to produce in any quantity that would pass the bean counters standards for common sense at supportable prices. I would think minimum runs are at least 1000 units, maybe more, and only if you have the needed dies.

Thanks for the replies. Most of the comments I have seen on other boards is they work. I have found Shuguang tubes from several sources, but none carry the SG-50. RF Parts carries the 811A they make I think. The Tube Store carries Shuguang too, just not the SG-50. Anyone bought from them?

Ive bought scores of their 572B's direct and service has been fast and reliability better than the same tubes from RF Parts.

Carl

Love the factory description of their product:
SG-50
SG-50 is a product being developed. It is designed by synthesizing the advantages of (德律风根) and American 50 tubes. It can be directly reciprocally with any kind of 50 tubes in the world. Its filament power is 7.5V, current 1.25±0.5A. And the maximum power of the positive electrode can reach 650V. The positive electrode is netted designed, with the grid gilded. SG-50 applies stem of large span to lead the lines, upper and down china sheet to fix the electrode. It applies eggplant shaped glass bulb, old hookdesignand black tube foot of china gold pin. The master designer of SG-50 shows originality in every detail of the design, trying to make it the pet of the 50-tube family. SG-50 is being sampled with good reflection. It is predicted that it will come into the market in June 2005.

David.

Well in my trilingual house this would be spot on or close as it gets. If they ever did make and sell it is another story. Like I said before, you would need to predict sales of thousands of them before any sane person would agree to make them. Of course they can be made, just boils down to if it makes sense to do so. I they have NOS available, I'd take a chance.

".. Its filament power is 7.5V, current 1.25±0.5A. And the maximum power of the positive electrode can reach 650V. .."
I can read through everything but the statement that power may be expressed in units of Volts alone. I know what they mean, but, the premise of that statement is just dead wrong.

If that's how much they understand, or can express, about the premises of their work, then how much can you trust the work itself?

No silkworms for me.

Larry

I think they do have a ready market, to some extent, for tubes like that, in Asia. Alot of those old audio tubes get snapped up by Asian buyers from Ebay. I sold a good lot of 45 tubes once to Singapore, I believe. As long as you are not worried about shipping them there, they have buyers. Then you have the probably smaller US and European markets for new made audio triodes. I am sure they could sell 1000, somewhere or other.

My only experience with Shuguang is my recent purchase of a matched quad set of EL-34-B output tubes.
These tubes sound wonderful and everything that I've read from any reviews by other users is all positive too.

The EL-34-Bs were a great price too at only $39.95 + shipping for all 4 tubes. Total was around $56.
Shipping was direct from China and very quick.. 10 days or so.

I am very pleased.

A few years ago I bought a set of 50`s from them. When they arrived one of them had the plate assembly bent over to the side of the glass envelope and one support broken.
I sent it back and they sent a replacement but when it arrived one of the hangers that support the filiment was bent and the filiment was hanging loose.
I sent it back and received another tube which seemed to be ok. I removed a set of RCA 50`s from by AK-66 and put the chinese tubes in . They lasted 20 minutes before the filiment on one of them opened.
The one I have left is in a tube box in the basement.
Nuf for me.

Not too late to ask to make it right. Like I said, this was probably a very limited production run, and they may have since either abandoned it or made another try. Perhaps they didn't try mailing a few samples back and forth and examining points of failure. Kind of stupid simple things I made a living on.

When you looked at the top of the tube, the elements were held together by a rather thick piece of ceramic. I think that the weight of it helped to make it unstable.
The sheet of paper that came with it had the test results on the tube. It stated if I remember right that the filiment voltage was 7.5 volts and the plate test voltage was 400 volts @ 35 ma.
They don't want to return your money. They want to keep sending you replacement tubes and after awhile I got tired of the shipping costs.
Mike.

Q.E.D. (again)

At least you were spared the adventure of watching them outgas, overheat and blast off.

Before I trust any silkworm output tube in ANY of my gear, I'll retire the gear.

Larry